Your browser doesn't support javascript.
loading
Mostrar: 20 | 50 | 100
Resultados 1 - 20 de 42
Filtrar
Mais filtros










Filtros aplicados

Base de dados
Intervalo de ano de publicação
1.
Cient. dent. (Ed. impr.) ; 16(3): 201-207, sept.-dic. 2019. tab, ilus
Artigo em Espanhol | IBECS | ID: ibc-185995

RESUMO

Introducción: El empleo de dientes autógenos, como material de injerto, es una opción terapéutica actual en casos de regeneración ósea. Su obtención se ha facilitado con la introducción de dispositivos capaces de procesar los dientes. El objetivo de este trabajo es realizar, a propósito de un caso clínico, una revisión de la literatura sobre el uso de dientes autólogos como material de injerto óseo y los dispositivos para su procesamiento. Caso clínico: Paciente varón de 18 años que acude a consulta presentando un cordal inferior retenido. El diagnóstico determinó la necesidad de extraer el diente y se informó al paciente de la posibilidad de utilizarlo como material de regeneración ósea. Tras la exodoncia, el diente procesado con el dispositivo Tooth Transformer(R) (Imbiodent), fue utilizado como material de injerto autólogo. El postoperatorio no presentó ninguna complicación y la evaluación radiográfica, tras 8 días y tras 10 semanas, mostró una evolución favorable del tratamiento. Discusión: La dentina desmineralizada es un material orgánico cuyo potencial reside en los factores de crecimiento que contiene para estimular la formación y reparación ósea. No obstante, no existe consenso sobre el grado de desmineralización o tamaño de partícula ideal. La reciente introducción de dispositivos, capaces de procesar dientes, facilita la obtención de un material de injerto dental para su uso en terapias de regeneración ósea. Conclusión: El uso de dientes autólogos constituye una alternativa prometedora en el campo de los injertos óseos. La técnica de transformación del diente es sencilla con el empleo de los dispositivos actuales


Introduction: The use of autogenous teeth, as graft material, is a current therapeutic option in cases of bone regeneration. Its obtention has been facilitated by the introduction of devices capable of processing teeth. The aim of this article is to perform, based on a clinical case, a review of the literature about the use of autologous teeth as bone graft material and the devices for its processing. Clinical case: Male patient, 18 years of age, who comes to the dental office presenting a lower wisdom retained. Extraction of the tooth was determined by diagnosis and the patient was informed about the possibility of using it as bone regeneration material. After the extraction, the tooth was processed by the Tooth Transformer(R) (Imbiodent) device and was used as autologous graft material. No postoperative complications were presented and the radiographic evaluation, at 8 days and 10 weeks, showed a favorable evolution of the treatment. Discusion: Demineralized dentin is a organic material whose potential relies in the growth factors it contains to stimulate bone formation and repair. However, there is no consensus on the degree of demineralization or the ideal particle size. The recent introduction of devices, capable of processing teeth, enables the obtention of a dental graft material for bone regeneration therapies. Conclusion: The use of autologous teeth is a promising alternative in the bonev grafts field. The technique of tooth transformation is simple with the use of the current devices


Assuntos
Humanos , Masculino , Adolescente , Regeneração Óssea , Polpa Dentária/citologia , Dentina , Carga Imediata em Implante Dentário/métodos , Transplante Ósseo/métodos , Procedimentos Cirúrgicos Reconstrutivos , Desmineralização do Dente , Esmalte Dentário/química , Procedimentos Cirúrgicos Bucais/métodos
2.
Cient. dent. (Ed. impr.) ; 16(2): 155-160, mayo-ago. 2019. tab
Artigo em Espanhol | IBECS | ID: ibc-183728

RESUMO

Las extracciones dentarias producen una pérdida ósea en sentido horizontal y vertical, que conllevan alteraciones funcionales para los pacientes, y dificultan la colocación de implantes dentales para los profesionales. Para minimizar esta pérdida ósea, se utilizan diferentes materiales de injerto, entre los cuales destaca el injerto autógeno, por cumplir las características de osteogénesis, osteoconducción y osteoinducción. En el año 2010 se describe por primera vez la utilización de dentina como material de injerto autógeno, demostrando que este material puede ser una alternativa terapéutica al resto de materiales de injerto, al permitir la osteoconducción y la osteoinducción, y mostrar la formación de hueso nuevo en un 46-87% del área con injerto de dentina autógena, 3 meses después de su utilización. La última revisión sistemática publicada en el año 2018, concluyó que los implantes colocados en áreas regeneradas en zonas en las que se empleó dentina como material de injerto, presentaron tasas de supervivencia del 97,7% después de 1 año de seguimiento, sugiriendo este nuevo material como una alternativa con resultados prometedores, aunque son necesarios más estudios al respecto


Subsequent to tooth extraction, a reduction of the length and width of alveolar ridge can be observed. It causes functional alterations to patiens, and problems to proper insertion of dental implants. In order to prevent this bone atrophy, different graft materials can be used, being considered autogenous graft the best because allows osteogenesis, osteoconduction and osteoinduction. In 2010 it was first published the use of autogenous dentine as a graft material, showing it could be an ideal graft material, as a material with excellent osteoconduction and osteoinduction. Besides, this graft material is slowly absorbed and replaced by new bone, in 46-87% of the áreas grafted with dentine, 3 months after regeneration. Last systematic review published in 2018 concluded dental implants inserted in regenerated areas with autogenous dentine had survival rates of 97,7% for over a year follow-up, so this new material is considered an alternative with good results, but there are necessary more studies with long term follow-up


Assuntos
Humanos , Animais , Cirurgia Bucal/instrumentação , Transplante Autólogo/métodos , Osteogênese , Regeneração Óssea , Dentina/metabolismo , Dentina Secundária/crescimento & desenvolvimento , Dentinogênese/fisiologia , Odontoblastos/fisiologia
3.
Med. oral patol. oral cir. bucal (Internet) ; 24(2): e156-e164, mar. 2019. tab, ilus, graf
Artigo em Inglês | IBECS | ID: ibc-180638

RESUMO

Background: The aim was to evaluate the effect of silver loaded nanoparticles (NPs) application on the triboscopic, crystallographic and viscoelastic properties of demineralized dentin. Polymethylmetacrylate-based NPs and Ag loaded NPs were applied on demineralized dentin. Material and Methods: Treated and untreated surfaces were probed by a nanoindenter to test viscoelasticity, and by atomic force microscopy to test nanoroughness and collagen fibril diameter. X-ray diffraction and transmission electron microscopy through selected area diffraction and bright-field imaging were also used. Results: Dentin treated with Ag-NPs attained the lowest complex modulus, and the highest tan delta values after 7 days of storage. Dentin treated with undoped-NPs achieved the lowest nanoroughness and the greatest collagen bandwidths among groups. Crystals were identified as hydroxyapatite with the highest crystallographic maturity and crystallite size in dentin treated with undoped-NPs. Texture increased in all samples from 24 h to 7 d, except in dentin surfaces treated with Ag-NPs at 310 plane. Polyhedral, block-like, hexagonal or plate-like shaped apatite crystals constituted the bulk of minerals in dentin treated with Ag-NPs, after 7 d. Polyhedral or rounded/drop-like, and polymorphic in strata crystal apatite characterized the minerals when undoped-NPs were used, with more crystalline characteristics after 7 d than that found when Ag-NPs were applied. Ag-NPs application did not improve the mechanical performance of dentin and did not produce dentin remineralization. However, energy was dissipated through the dentin without showing stress concentration; contrary was occurring at dentin treated with undoped- NPs, that provoked bridge-like mineral deposits at the dentin surface. Conclusions: Ag-NPs application did not enhance the mechanical properties of cervical dentin, though the energy dissipation did not damage the dentin structure. Remineralization at dentin was not produced after Ag-NPs appli-cation, though improved crystallinity may lead to increase stability of the apatite that was generated at the dentin surface


No disponible


Assuntos
Humanos , Dentina/fisiopatologia , Nanopartículas Metálicas/uso terapêutico , Prata/uso terapêutico , Desmineralização do Dente/terapia , Remineralização Dentária/métodos , Calcificação Fisiológica/fisiologia
4.
Med. oral patol. oral cir. bucal (Internet) ; 24(1): e53-e60, ene. 2019. ilus, graf, tab
Artigo em Inglês | IBECS | ID: ibc-180406

RESUMO

Background: The objectives of the present pilot study are to compare via CBCT the alveolar contraction suffered both vertically and horizontally between the control group and the group using autologous dental material (ADM), as well as to study the densitometric differences between both post-extraction sockets. Material and Methods: A split-mouth study was performed in n = 9 patients who required two extraction of single-rooted teeth deemed suitable for deferred rehabilitation with osseointegrated implants. Two groups were formed - a control group, in which the post-extraction socket was not filled, and an ADM group, in which the alveolar defect was filled with freshly processed autogenous dental material. Both dimensional and densitometric analyses of the alveoli were performed in both groups immediately after surgery (baseline), as well as 8 weeks and 16 weeks later. Results: The mean height of alveolar bone loss was: VL (Control 1.77 mm, loss of 16.87% of initial alveolar height; ADM 0.42 mm, loss of 4.2% of initial alveolar height), HL-BCB (Control 2.22 mm, ADM 0.16 mm, p= 0.067 at 16 weeks). The mean bone loss of the vestibular width (VL-BCB) was much higher in the control group (1.91 mm at 1 mm, 1.3 mm at 3 mm, and 0.89 mm at 5 mm) than in the ADM group (0.46 mm at 1 mm, 0.21 mm at 3 mm, 0.01 at 5 mm, p=0.098 at 16 weeks). At 16 weeks, densitometric analysis of the coronal alveolar area revealed a bone density of 564.35 ± 288.73 HU in the control group and 922.68 ± 250.82 HU in the ADM group (p=0.045 ). Conclusions: In light of these preliminary results, autologous dentine may be considered a promising material for use in socket preservation techniques


No disponible


Assuntos
Humanos , Masculino , Feminino , Adulto , Pessoa de Meia-Idade , Retalhos Cirúrgicos , Dentina/transplante , Extração Dentária/métodos , Perda do Osso Alveolar/cirurgia , Implantação Dentária Endo-Óssea/métodos , Transplante Autólogo/métodos , Densitometria/métodos , Preservação de Tecido/métodos
5.
Endodoncia (Madr.) ; 36(2): 10-22, nov. 2018. graf, ilus, tab
Artigo em Espanhol | IBECS | ID: ibc-175977

RESUMO

El objetivo de este estudio fue comparar la frecuencia de microfracturas dentinarias después de la instrumentación con sistemas rotatorios y recíprocos. Se seleccionaron 50 incisivos inferiores, con un solo conducto. Se prepararon las cavidades de acceso y sellaron con Cavit(R). Cada raíz fue envuelta con una lámina de papel de aluminio, e incluida en resina acrílica autopolimerizable. Luego, se retiró la pieza de la resina, la hoja de aluminio e impresionó con silicona. La misma ocupó el espacio simulando el ligamento periodontal. Las muestras se dividieron al azar en cinco grupos de 10 piezas cada uno (n=10). Grupo 1: Control; Grupo 2: Sistema Mtwo(R); Grupo 3: Sistema RaCe(R); Grupo 4: Sistema Reciproc(R) y Grupo 5: Sistema WaveOne(R). Después de la preparación, las raíces fueron seccionadas horizontalmente a 3, 6 y 9 mm desde el ápice y observadas con microscopio estereoscópico a una magnificación de 30X. Se determinó la presencia de microfractura cuando la misma fue encontrada en 1 o más niveles. Se usó el Test Exacto con un nivel de significancia a=0,05. No se observaron defectos en el grupo 1. Todos los sistemas causaron microfracturas dentinarias, sin diferencias entre los grupos a los 3 mm, 6mm y 9mm. Las piezas preparadas por el sistema Reciproc fueron los que presentaron mayor frecuencia de microfracturas (30%), seguido por el sistema Mtwo y Race, cada uno con el 23% y finalmente, el sistema WaveOne con el 20%. Con excepción del grupo control, todos los grupos experimentales mostraron microfracturas. Aunque Reciproc mostró más grietas, no hubo diferencias entre los sistemas


The aim of this study was to compare the frequency of dentin microfractures after instrumentation with rotary and reciprocating systems. Fifty mandibular incisors with single canals were selected. Access cavities were prepared and sealed. Each root was wrapped with a single layer of aluminium foil and embedded in auto polymerizing resin. Aluminium foil was then peeled off. All roots were covered with a fine layer of silicon impression material simulating the periodontal ligament. Samples were randomly divided into five groups of 10 pieces each (n = 10). Group 1: Control; Group 2: Mtwo(R) System; Group 3: RaCe(R) System; Group 4: Reciproc (R) System and Group 5: WaveOne(R) System. After preparation, the roots were sectioned horizontally at 3, 6 and 9 mm from the apex. Samples were viewed under stereomicroscope at 30X magnification. The presence of microfracture was determined when it was found in 1 or more levels. The Exact Test was used with a level of significance a=0,05. No defects were observed in group 1. All systems caused dentinal microfractures, with no differences between groups at 3 mm, 6 mm and 9 mm. The pieces prepared with the Reciproc system were the ones with the highest microfracture frequency (30%), followed by the Mtwo and Race systems, each with 23% and finally the Waveone system with 20%. With the exception of the control group, all experimental groups showed microfractures. Although Reciproc showed more cracks, there were no differences between the systems


Assuntos
Humanos , Dentina/lesões , Fraturas dos Dentes/etiologia , Selantes de Fossas e Fissuras , Preparo de Canal Radicular/efeitos adversos , Estudos de Casos e Controles
6.
Med. oral patol. oral cir. bucal (Internet) ; 23(6): e646-e655, nov. 2018. ilus, tab
Artigo em Inglês | IBECS | ID: ibc-176386

RESUMO

Background: The purpose of this study was to evaluate nanohardness and viscoelastic behavior of dentin surfaces treated with two canal sealer cements for dentin remineralization. Material and Methods: Dentin surfaces were subjected to: I) 37% phosphoric acid (PA) or II) 0.5 M ethylenediaminetetraacetic acid (EDTA) conditioning prior to the application of two experimental hydroxyapatite-based cements, containing sodium hydroxide (calcypatite) or zinc oxide (oxipatite), respectively. Samples were stored in simulated body fluid during 24 h or 21 d. The intertubular and peritubular dentin were evaluated using a nanoindenter to assess nanohardness (Hi). The load/displacement responses were used for the nano-dynamic mechanical analysis to estimate complex modulus (E*) and tan delta (δ). The modulus mapping was obtained by imposing a quasistatic force setpoint to which a sinusoidal force was superimposed. AFM imaging and FESEM analysis were performed. Results: After 21 d of storage, dentin surfaces treated with EDTA+calcypatite, PA+calcypatite and EDTA+oxipatite showed viscoelastic discrepancies between peritubular and intertubular dentin, meaning a risk for cracking and breakdown of the surface. At both 24 h and 21 d, tan δ values at intertubular dentin treated with the four treatments performed similar. At 21 d time point, intertubular dentin treated with PA+oxipatite achieved the highest complex modulus and nanohardness, i.e., highest resistance to deformation and functional mineralization, among groups. Conclusions: Intertubular and peritubular dentin treated with PA+oxipatite showed similar values of tan δ after 21 d of storage. This produced a favorable dissipation of energy with minimal energy concentration, preserving the structural integrity at the dentin surface


No disponible


Assuntos
Humanos , Cemento Dentário/fisiologia , Calcificação Fisiológica , Dentina/metabolismo , Cimentos para Ossos/química , Cimento de Fosfato de Zinco/administração & dosagem , Fenômenos Biomecânicos , Teste de Materiais
7.
Endodoncia (Madr.) ; 35(2): 76-87, abr.-jun. 2017. graf, ilus, tab
Artigo em Espanhol | IBECS | ID: ibc-172307

RESUMO

La efectividad antimicrobiana de la terapia fotodinámica (TFD), como complemento a la preparación biomecánica, depende del íntimo contacto entre un agente fotosensible, una fuente de energía (LED) y los microorganismos presentes en el conducto. Objetivo. Evaluar si la eliminación del barrillo dentinario influye en la penetración del agente fotosensibilizante dentro de los túbulos dentinarios en la TFD. Metodología. 20 premolares con conductos tipo I fueron decoronados a 12 mm del ápicy preparados biomecánicamente con MTwo y NaOCL al 5,25%. La muestra se dividió aleatoriamente en dos grupos (ni = 10): I, se irrigó con EDTA 17% seguido de suero fisiológico; II, se irrigó sólo con suero fisiológico. Tras la aplicación de la TFD, los especímenes fueron seccionados, obteniéndose discos correspondientes a los tercios coronal, medio y apical. Las muestras fueron visualizadas con un microscopio óptico de reflexión y el software Canvas X16. Se evaluaron el porcentaje de área teñida (PAT) y la penetración intratubular media (PIM). Análisis estadístico: Tests U de Mann-Whitney y Wilcoxon con un nivel de significación de p<0,05. Resultados. Los resultados de PAT y PIM fueron mayores en el grupo I (11,1 ± 5,1/0,45 ± 0,18) que en el II (4,93 ± 4,1/0,26 ± 0,16). No hubo diferencias significativas de PIM en los tercios coronales de I vs. II. Ambos grupos presentaron diferencias de PAT y PIM entre sus tercios. Conclusión. La remoción del barrillo dentinario previa a la aplicación de la TFD mejora significativamente la penetración del agente fotosensible en los tres tercios de la raíz


Antimicrobial efectiveness of the photodynamic therapy (PDT), in addition to chemicomechanical preparation, depends on the contact between a photosensitizer, a light source (LED) and root canal microorganisms. Aim. To evaluate if the removal of smear layer influences the penetration of the photosensitizer into dentinal tubules in the PDT. Methodology. 20 premolars with Type I canals were sectioned at 12 mm from apex and conformed with MTwo and 5.25% NaOCl. Were randomized divided in two groups (ni = 10): group I was irrigated with 17% EDTA and 0.9% NaCl; group II was irrigated with 0.9% NaOCl. For the PDT 0.01% of TBO (Fotosan® ,CMS) as photosensitizer was applied into the canal and activated for 30 sec with a LED red light source (Foto-san630®, CMS). After this, all specimens were sectioned in order to obtain dentin discs of coronal, medium and apical third. Samples were evaluated with an optical microscope at 20x and the software Canvas X16, measuring the percentage of stained area (PAT) and Intratubular media penetration (PIM). Statistical analysis: Test U de Mann-Whitney y Wilcoxon with a significance level of p < 0.05. Results. The results of PAT and PIM were higher in Group I (11,1 ± 5,1/0,45 ± 0,18) than Group II (4,93 ± 4,1/0,26 ± 0,16). No significant differences of PIM were founded between coronal thirds of I vs II. Both groups presented differences of PAT and PIM between their thirds. Conclusion. The removal of smear layer before the TFD application improves the penetration of the photosensitizer in the three root thirds


Assuntos
Humanos , Camada de Esfregaço/complicações , Cura Luminosa de Adesivos Dentários/métodos , Fotoiniciadores Dentários/análise , Irrigantes do Canal Radicular/uso terapêutico , Dentina , Cloreto de Tolônio/uso terapêutico , Tratamento do Canal Radicular/métodos , Técnicas In Vitro
8.
Endodoncia (Madr.) ; 34(4): 204-219, oct.-dic. 2016. tab, ilus
Artigo em Espanhol | IBECS | ID: ibc-160979

RESUMO

La caries dental es la principal etiología de la pulpitis y la periodontitis apical. Ante un diente afectado por caries, el diagnóstico correcto de la extensión de la lesión cariosa y del grado de afectación pulpar es esencial para decidir entre el tratamiento endodóncico invasivo o un procedimiento operatorio preventivo y conservador. En la actualidad, el tratamiento de la lesión de caries debe basarse en los principios y las técnicas de la odontología mínimamente invasiva. Sin embargo, un problema importante que se aprecia cuando se lee literatura científica sobre la caries es que la terminología utilizada para referirse a la dentina cariada y a los procedimientos que se emplean para eliminar el tejido cariado no es uniforme. En este trabajo se abordan y se revisan los cambios propuestos por el grupo International Caries Consensus Collaboration (ICCC) en su reunión de Leuven (Bélgica) en 2015, en lo relativo a terminología, manejo de la caries y a las técnicas operatorias indicadas para el tratamiento de los diferentes tipos de lesiones de caries dentinaria


Dental caries is the main etiologic factor of pulpitis and apical periodontitis. When a tooth affected by caries must be treated, the correct diagnosis of the extent of carious lesion and the degree of pulp involvement is essential to decide between invasive endodontic treatment or preventive and conservative operative procedure. At present, the treatment of carious lesion should be based on the principles and techniques of minimally invasive dentistry. However, an important problem when reading scientific literature about dental caries is that the terminology used to refer to carious lesions and to the procedures used to remove the carious tissue is not uniform. The aim of this paper is to address and review the changes proposed by the International Caries Consensus Collaboration Group (ICCC), in its convention in Leuven (Belgium) in 2015, with regard to the terminology, management of caries, and operative techniques indicated for the treatment of the different types of dentine carious lesions


Assuntos
Humanos , Masculino , Feminino , Cárie Dentária/diagnóstico , Endodontia/métodos , Dentina/lesões , Pulpite/diagnóstico , Abscesso Periapical/diagnóstico , Selantes de Fossas e Fissuras/uso terapêutico , Consenso , Traumatismos Dentários/terapia , Procedimentos Cirúrgicos Minimamente Invasivos/métodos
9.
Endodoncia (Madr.) ; 33(3): 137-149, jul.-sept. 2015. tab
Artigo em Espanhol | IBECS | ID: ibc-146586

RESUMO

Introducción: La descementación del poste es una causa importante del fracaso de los dientes endodonciados reconstruidos con retención intrarradicular, por lo que es un reto restaurativo para el clínico. Aún existe controversia acerca de qué sistema de cementado proporciona mayor retención del poste. El objetivo de esta revisión es hacer un análisis descriptivo de las publicaciones que existen sobre la retención de los postes de fibra de vidrio con los tres tipos de cementos resinosos: grabado y lavado, autograbadores y autoadhesivos. Material y métodos: Búsqueda en la base de datos MEDLINE (Pubmed), limitando la búsqueda a estudios in vitro publicados en revistas indexadas, con máximo 10 años de antigüedad y en idioma inglés. Las palabras clave utilizadas fueron «glass fiber post & resin cements» y «posts retention & resin cements». Resultados: Tras la búsqueda se hallaron 42 artículos, de los cuales solo 20 cumplían los criterios de selección. De los nueve artículos que valoraban la retención con los tres sistemas de cementos resinosos, la mayoría encontró valores superiores de retención para los cementos autoadhesivos. De los siete artículos en que se comparaba la retención de los sistemas de cementos de resina convencional y los autoadhesivos, también la mayoría encontró mayores valores de retención para los cementos autoadhesivos. Conclusiones: La retención de los postes de fibra de vidrio mediante cualquiera de los cementos resinosos es una técnica válida y predecible, existiendo evidencia parcial de que los sistemas autoadhesivos consiguen una mayor retención a la dentina radicular


Introduction: Post debonding is the main cause of failure of endodontically treated teeth and its restoration remains a challenge for clinicians. There is still controversy about which system provides greater post retention. The objective of this review is to make a descriptive analysis of the publications about the retention of glass fiber post using the three resin cement systems: etch and rinse, self-etch and self-adhesive. Material and Methods: Search in MEDLINE databases (Pubmed), limiting the search to «in vitro» studies published in indexed journals within the last ten years. The key words used were: «glass fiber post & resin cements» and «posts retention & resin cements». Results: They were found 42 articles, which only 20 met the selection criteria. Nine studies compared the retention using the three resin cements systems, finding most of them higher retention values for the self-adhesive systems. Amongst the seven studies comparing the retention of conventional resin cements systems with self-adhesive systems, self-adhesive systems showed higher retention. Conclusions: Glass fiber post retention using resin cements seems to be a valid and predictible technique, with partial evidence suggesting that self-adhesive systems achieve a higher retention to radicular dentin


Assuntos
Cimentos de Resina/uso terapêutico , Endodontia/instrumentação , Colagem Dentária , Adesivos Dentinários/uso terapêutico , Dentina , Cimentos de Resina/uso terapêutico
10.
Med. oral patol. oral cir. bucal (Internet) ; 18(4): 733-736, jul. 2013. ilus, tab
Artigo em Inglês | IBECS | ID: ibc-114499

RESUMO

Objective: To study nanostructural dentinal changes produced by endodontic irrigants. Study Design: Experimental study. Nanoindentations were performed on peritubular (PD) and intertubular dentine (ID) with an atomic force microscopy. Stiffness and adhesion force were determined before and after application of 5.25% sodium hypochlorite (NaOCl) and 17% ethylenediaminetetraacetic acid (EDTA). Normalized differences before and after treatment for stiffness and adhesion forces were calculated. A paired T-test was used to compare stiffnes and adhesion force before and after irrigants application. Results: After treatment with EDTA there was a 29.80% reduction in stiffness in ID and a 63.53% reduction in PD. Adhesion force was reduced by 21.22% and 8.21% respectively. After treatment with 5.25% NaOCI stiffness was reduced by 2.49% in ID and increased by 15.01% in PD. Adhesion force increased by 25.11% and 23.97% respectively. Conclusions: 17% EDTA reduced stiffness and adhesion force in ID and PD. Treatment with NaOCI at 5.25% had no significant effect on stiffness but did affect adhesion force in ID and PD (AU)


Assuntos
Humanos , Irrigantes do Canal Radicular/efeitos adversos , Nanoestruturas/análise , Dentina , Microscopia de Força Atômica/métodos , Cimentos Dentários/análise
11.
Med. oral patol. oral cir. bucal (Internet) ; 18(3): 537-541, mayo 2013. ilus
Artigo em Inglês | IBECS | ID: ibc-112722

RESUMO

Objectives: The aim of this report is to present the results of a scanning electron microscopic study on the presence of matrix vesicles (MVs) found in human dentine. Study Design: Dentin tissue from 20 human bicuspids was analyzed by means of scanning electron microscopy. Results: MVs were found as outgrowths of the cellular membrane of the odontoblastic body, the more proximal portion of the odontoblastic process before entering the dentinal tubule and in the odontoblastic process within the inner third of the dentin. Size of MVs varied depending on location. In the inner third of dentin, they were seen indiverse positions; as membranal outgrowths, deriving from the odontoblastic process, lying free in the intratubular space and attached to the dentinal wall. Sometimes, they were seen organized forming groups of different size sand shapes or as multivesicular chains running from the surface of the odontoblastic process to the tubular wall. MVs were present in places never considered: 1) the body of odontoblasts; 2) the most proximal part of the odontoblastic processes before entering the circumpulpal dentine and also: 3) in the inner third of dentinal tissue. Conclusions: According to our results, MVs not only participate during mantle dentin mineralization during early dentinogenesis, they also contribute during the mineralization process of the inner dentin (AU)


Assuntos
Humanos , Dentina/ultraestrutura , Microscopia Eletrônica de Varredura/métodos , Odontoblastos/ultraestrutura , Membrana Celular/ultraestrutura , Matriz Óssea/ultraestrutura
12.
Med. oral patol. oral cir. bucal (Internet) ; 17(6): 988-993, nov. 2012. ilus, tab
Artigo em Inglês | IBECS | ID: ibc-106095

RESUMO

Objective: The objective of our study is to analyse (with the help of scanning electron microscopes) the quality of the dental root surface and the appearance of dental cracks after performing apical preparations using two different types of ultrasonic tips. Study design: We used 32 single-rooted teeth that underwent a root canal and apical resection. Afterwards, the teeth were divided into 4 groups of 8 teeth each, with preparations of the apical cavities in the following manner: Group 1: stainless steel ultrasonic tip at 33KHz. Group 2: stainless steel ultrasonic tip at 30KHz. Group 3: diamond ultrasonic tip at 30KHz. Group 4: diamond ultrasonic tip at 33 KHz. The quality of the root surface and the presence of cracks were evaluated by one single observer using a scanning electron microscope. Results: All of the teeth in our study had cracks after the apical preparations. The mean number of cracks per tooth ranged between 6.1±1.9 (group 1) and 3.5±2.4 (group 4), with a significantly higher number found in the groups that used stainless steel tips (P=.03). The types of cracks produced involved: 8 complete cracks (4.5%), 167 incomplete cracks (94.4%), and 2 intradentinal cracks (1.1%), with no significant differences observed between the different frequencies used for each group. Conclusions: Stainless steel ultrasonic tips provoked a larger number of cracks than diamond tips. The frequency of vibration used did not have any effect on the number of cracks found (AU)


No disponible


Assuntos
Humanos , Materiais Restauradores do Canal Radicular/análise , Preparo de Canal Radicular/instrumentação , Obturação do Canal Radicular/métodos , Apicectomia/métodos , Microscopia Eletrônica de Varredura/métodos , Ultrassonografia , Dentina/lesões
13.
Med. oral patol. oral cir. bucal (Internet) ; 17(4): 644-648, jul. 2012. tab
Artigo em Inglês | IBECS | ID: ibc-103100

RESUMO

Objectives: to evaluate the effect of sodium hypochlorite (NaOCl) treatment on surface dentin roughness (Ra) and contact angle (CA) when using Prime&Bond NT adhesive (PB NT). Study Design: Extracted human third molars were sectioned to expose flat, superficial and deep dentin surfaces. CA and Ra were measured (1) before and (2) after 35% H3PO4 etching, and (3) H3PO4 etching + 5% NaOCl treated for 2 minutes before the application of PB NT. CA was measured by the Axisymmetric Drop Shape Analysis Technique using distilled and deionized water and PB NT. Roughness was evaluated with a profilometer, twelve radial measurements were performed in each treatment surface. Data were analyzed with two-way ANOVA and Newman-Keuls multiple comparison test procedures. Results: CA values decreased after acid etching and even more after NaOCl treatment on deep dentin when water was tested. With resin, there were not differences on CA results after H3PO4 neither after NaOCl treatment, in both dentin surfaces. Etching and NaOCl treatment resulted in surface roughness increase. Conclusions: In spite of the higher roughness after NaOCl treatment on superficial and deep dentin, the use of 5% NaOCl for 2 min after dentin demineralization when PB NT was employed did not improved the wettability of dentin, probably due to nanofiller content and/or hydrogen-bonding interactions with residues of the organic matrix on collagen-depleted dentin (AU)


Assuntos
Humanos , Adesivos Dentinários , Hipoclorito de Sódio/farmacocinética , Dentina/anatomia & histologia , Solubilidade da Dentina , Acetona/farmacocinética , Corrosão Dentária
14.
Med. oral patol. oral cir. bucal (Internet) ; 17(2): 337-344, mar. 2012. ilus, tab
Artigo em Inglês | IBECS | ID: ibc-98964

RESUMO

Objectives: Several adhesive systems are available for cementation of fibre posts into the root canal. The aim of the present study was to investigate the push-out bond strengths of quartz fibre posts to root dentin with the use of different total-etch and self-adhesive resin cements. Study Design: Ninety single-rooted human premolars were endodontically treated and standardized post-spaces were prepared. Fibre posts were cemented with different luting agents: total-etch (Nexus NX3, Duo-Link, and RelyX ARC) and self-adhesive resin cements (Maxcem Elite, BisCem, and RelyX Unicem). Three post/dentinsections (coronal, middle and apical) were obtained from each specimen, and push-out bond strength test was performed in each section at a cross-head speed of 0.5 mm/min. Data was analyzed with two-factor and one-way analysis of variance and a post-hoc Tukey test at a significance level of p < 0.05.Results: Cement type, canal region, and their interaction significantly influenced bond strength. Significantly higher bond strength values were observed in the apical region of self-adhesive cements. Only Duo-Link and RelyX ARC cements resulted in homogeneous bond strengths. Conclusions: Cementation of quartz fibre posts using self-adhesive cements provided higher push-out bond strengths especially in the apical region, while total-etch cements resulted in more uniform bond strengths indifferent regions of the root canal (AU)


Assuntos
Humanos , Quartzo/análise , Dentina , Raiz Dentária , Materiais Restauradores do Canal Radicular/análise , Preparo de Canal Radicular/métodos , Resistência de Materiais/métodos , Cimentos Dentários/uso terapêutico , Autocura de Resinas Dentárias
15.
Med. oral patol. oral cir. bucal (Internet) ; 16(7): 1022-1030, .nov. 2011. ilus, tab
Artigo em Inglês | IBECS | ID: ibc-93505

RESUMO

Objectives: The purpose of this study was to evaluate the changes in dentinal permeability (i.e. hydraulic conductance)after prophylactic treatments performed using prophy-powders with air-polishing system or prophy-pasteson exposed middle dentine. The changes in dentine morphology were evaluated by SEM.Study design: Commercial prophylactic pastes and air-polishing powders were tested in this study. Dentine discs from human third molars were used to study the quantitative reduction of the dentine permeability under simulated pulpal pressure (20 cm H2O). Further specimens were gold-coated and analysed using observed a SEM.Results: The results of this study showed different dentine permeability redaction based on the type of productemployed (i.e. prophylactic paste or air-polishing powders). The use of Sylc bioactive glass and sodium bicarbonate were the most effective in reducing dentine permeability of the specimens. However, the air-polishing procedures performed with Sylc bioactive glass created a dentine surface devoid of exposed dentinal tubules due to the presence of a compact multilayered smear layer. Colgate Sensitive Pro-Relief and Nupro NU-Solution reduced thedentine permeability up to 69.8% and 66.9% respectively.Conclusion: Although all the tested products are able to statistically reduce dentine permeability, Sylc bioactiveglass is an innovative and effective product which completely occludes the dentinal tubules during prophylactic procedures of air-polishing (AU)


Assuntos
Humanos , Permeabilidade da Dentina , Dentina/ultraestrutura , Dentifrícios/farmacocinética , Abrasão Dental por Ar
16.
Endodoncia (Madr.) ; 29(3): 119-125, jul.-sept. 2011. ilus, tab
Artigo em Espanhol | IBECS | ID: ibc-102083

RESUMO

Objetivo: El propósito de este estudio fue evaluar y comparar “ex vivo”, el porcentaje de paredes dentinarias instrumentadas, mediante el uno de instrumentos de niquel-titanio pertenecientes a los sistemas rotatorios ProTaper Universal e Easy RaCe, complementado con S-Apex. Material y métodos: Se utilizaron 20 dientes unirradiculares humanos extraídos e incorporados en un nuevo tipo de modelo experimental para evaluar la eficiencia de la instrumentación. Se dividió la muestra en dos grupos homogéneos de 10 dientes (n=10) cada uno. En el Grupo 1 los conductos se instrumentaron con ProTaper Universaly en el Grupo 2 Easy RaCe/S-Apex, complementado con S-Apex. Se realizaron secciones transversales de cada espécimen a 3,9 y 15 mm de la longitud de trabajo (LT), lo que fueron fotografiados con microscopía óptica. Las imágenes fueron digitalizadas y evaluadas comparando la morfología de los conductos, antes y después de la instrumentación. Los datos obtenidos fueron analizados por medio la las pruebas no paramétricas de Mann-Whitney y Friedman, estableciéndose un nivel de significación de P<0,05. Resultados y conclusiones: A 15 mm de la LT, el sistema Easy RaCe/S-Apex demostró un desempeño significativamente superior (p<0,05) en comparación con ProTaper Universal. No hubo diferencias significativas (p>0,05), entre ambos sistemas a 3 y 9 mm de la LT (AU)


Objetive: The purpose of this ex vivo study was to evaluate and compare, the percentage of instrumented dentine walls in sections made at 3, 9 and 15 mm form the working length, using engine-driven nickel-titanium instrumentation systems. Protaper Universal and EasyRaCe complemented with S-Apex. Materials and methods: Twenty extracted single rooted human teeth were used along with a new type of experimental model. The sample was divided into two homogeneous groups of 10 teeth each (n=10). In group 1 the canals were instrumented with ProTaper Universal while in group 2 canals were instrumented with Easy RaCe/S-Apex. All specimens were standardized at 19 mm. They were then horizontally sectioned at 3,9 and 15 mm form the working length, and photographed using light microcopy. The images were digitalized and evaluated, comparing the morphology of the canals before and after instrumentation. Results and conclusions: the results were analyzed using the Mann-Whitney-U test and Friedman´s non-parametric tests, with a significance level of P<0,05. At 15 mm form the working length, the results revealed a significantly better performance for the Easy RaCe/S-Apex system, compared to the ProTaper Universal system. No significant differences were found between both systems at 3 and 9 mm form the working length (AU)


Assuntos
Humanos , Preparo de Canal Radicular/instrumentação , Instrumentos Odontológicos , Camada de Esfregaço , Dentina/ultraestrutura , Microscopia
17.
Av. periodoncia implantol. oral ; 22(1): 19-25, abr. 2010. ilus, tab
Artigo em Espanhol | IBECS | ID: ibc-87640

RESUMO

Para analizar al MEB las características micro morfológicas de la adhesión dentinaria en superficies radiculares expuestas a enfermedad periodontal y tratadas con pulido radicular, se utilizaron 30dientes, separados en tres grupos: Grupo 1: Dientes con enfermedad periodontal tratados solo con pulido radicular. Grupo 2: Dientes con enfermedad periodontal tratados con pulido radicular y sometidas a grabado con ácido fosfórico al 34% por dos minutos. Grupo 3: Dientes con enfermedad periodontal tratados con pulido radicular, en las cuales se realizó todo el protocolo adhesivo para confeccionar resinas compuestas. Resultados. Grupo 1: Se observó una capa de barro dentinario en toda la superficie. Grupo 2: Presentaba una irregular capa de barro dentinario. Grupo 3: Se observó una seudocapa hibrida de 15,9 um de grosor, pero no se evidencio la presencia de tags deresina. Conclusiones. La adhesión en raíces con enfermedad periodontal y tratadas con pulidoradicular se realiza sobre barro dentinario que no es removido por la acción del ácido fosfórico, no formándose capa hibrida ni tags de resina, por lo tanto creemos que la adhesión como concepto propiamente tal no existe en estos tejidos (AU)


The aim of this in vitro study was to analize some characteristics of dentinary adhesion over root surfaces exposed to periodontal disease an treated with root planning by observing the samples at SEM. 30 teeth were classified in three groups. Group 1: Teeth with periodontal disease treated only by root planning. Group 2: Teeth with periodontal disease treated by root planning and 34% fosforic acid etching. Group 3: Teeth with periodontal disease treated by root planning at and an adhesive composite restoration. Results: Group 1 presented a thick smear layer over all the treated surface. Group 2 presented an irregular adhesive layer. Group 3 showed a 15.9 µm thick layer that looks as an hybrid layer, composite tags were not found in this group. Conclusions: Dentine adhesion over teeth with periodontal disease and treated by root planning is achieved over a thick smear layer, which is not removed by fosforic acid. Hybrid layer and composite tags were not formed, so it is assumed that adhesion does not occur (AU)


Assuntos
Humanos , Preparo de Canal Radicular/métodos , Microscopia Eletrônica de Varredura/métodos , Dentina/ultraestrutura , Camada de Esfregaço , Colagem Dentária , Doenças Periodontais/fisiopatologia
18.
Endodoncia (Madr.) ; 28(1): 12-18, ene.-mar. 2010. ilus, tab
Artigo em Espanhol | IBECS | ID: ibc-102089

RESUMO

Objetivo: Evaluar en conductos curvos, utilizando la técnica de fuerzas balanceadas, la extensión de paredes instrumentadas (sin predeterminar) y libres de restos orgánicos, producida por limas de Flex-R, Onyx-R y Nitiflex. Materiales y Métodos: Se seleccionaron 60 molares inferiores. Se fotomicrografiaron cortes histológicos del tercio apical de cada espécimen y sobre las fotos, en hojas transparentes, se realizó un trazado en diferentes colores, de las zonas a evaluar. Estas imágenes fueron escaneadas y medidas. Los datos fueron estudiados con test no paramétrico de Kruskall-Wallis. Resultados: Los resultados no mostraron diferencias estadísticas significativas entre los grupos, en términos de porcentaje de pared del conducto con restos orgánicos (Kruskall-Wallis p=0,35) y porcentaje de pared del conducto sin restos orgánicos (Kruskall-Wallis p=0,374). Los resultados no mostraron diferencias estadísticas significativas entre los grupos, respecto al porcentaje de pared del conducto conformada (Kruskall-Wallis p=0.44) y porcentaje de pared del conducto no conformada (Kruskall-Wallis p=0,176). Los resultados no mostraron diferencias significativas entre las limas respecto a la instrumentación y limpieza de los conductos. Además, se evaluó la forma final de los conductos según el trazado de dos ejes. Los datos fueron analizados con un test Chi-Cuadrado (p= 0,88). No se encontró diferencia significativa entre los grupos. Los conductos mostraron un contorno redondeado u ovalado en la mayor parte de los casos. Conclusión: Ninguno de los instrumentos fue capaz de lograr una limpieza completa del conducto ni una instrumentación total de las paredes. En la mayoría de los casos, los instrumentos, produjeron preparaciones de sección redonda o ligeramente oval, conductos clínicamente deseables para la obturación (AU)


Objetive: To compare incurved root Canals using balanced forcé techniques, the amount of planed canal wall (áreas with predentin) and without organic debris, during preparation with Flex-R, Onyx-R y Nitiflex files. Study Design: Sixty mandibular molars were chosen. The areas to be evaluated were outlined in different colors on tracings over microphotographs form histological sections of each specimen. These images scanned and measured. Statistical analysis was perfomed employing the non-parametric Kruskall-Wallis test. Results: The test showed no statistically significant differences between groups in terms of the percentage of canal wall area with organic debris (KruskallWallis p=0,35) or percentage of canal wall area with no organic debris (Kruskall-Wallis p=0.374). The test showed no statistically significant differneces between groups in terms of the percentage of planed canal wall area (Kruskall-Wallis p=0.44) and non-planed canal wall area (Kruskall-Wallis p=0.176). The results showed no statistically significant differences were found between quality preparation, shape and the different instruments. The final canal shape was evaluated in terms of their two axes, (p=0,88) by Chi-square test. None of the instruments were capable of complete cleansing canal´s system or planning walls. Canals exhibited mosthly round or oval contours. Conclusion: None of the instruments were capable of complete cleansing canal´s system or planning walls. In most cases, we obtained round or slightly oval preparations that are clinically adequate for obturation (AU)


Assuntos
Humanos , Preparo de Canal Radicular/instrumentação , Cavidade Pulpar/anormalidades , Instrumentos Odontológicos , Cavidade Pulpar/ultraestrutura , Tratamento do Canal Radicular/instrumentação , Camada de Esfregaço , Dentina/ultraestrutura
19.
Endodoncia (Madr.) ; 27(4): 190-194, oct.-dic. 2009.
Artigo em Espanhol | IBECS | ID: ibc-94990

RESUMO

Objetivo: El propósito de este trabajo fue evaluar el espesor remanente de dentina /cemento en conductos mesio vestibulares de molares inferiores instrumentados con limas Flexo-File sistemas rotatorios Profile, ProTaper y RaCe. Material y Métodos: Se seleccionaron 75 molares inferiores, con angulaciones en su conducto mesio-vestibular entre 15º a 45º. Las raíces fueron incluidas en resina transparente utilizando como llave un dispositivo plástico. Las piezas fueron distribuidas de acuerdo a su angulación en cinco grupos: Grupo 1: Técnica escalonada con limas Flexo-File. Grupo 2: Sistema Profile, Grupo 3: Sistema ProTaper, Grupo 4: Sistema RaCe y Grupo 5: Testigo. Luego de la Instrumentación la raíces fueron seccionadas horizontalmente a nivel de la furcación, en el punto donde se inicia la curva y a 3 mm. Del ápice. Se midió en centésima de milímetro el menor espesor posoperatorio de cada raíz en mesial y distal en los tres niveles de corte. Resultados y conclusiones: El análisis estadístico mediante el test ANOVA no mostró diferencias significativas en los espesores dejados por las distintas técnicas a nivel cervical, medio y apical (AU)


Objective: The purpose of this investigation was to evaluate the dentin/cementum remanent thickness in lower molar mesio-vestiular root Canals instrumented with Flexo-files, Profile, Protaper and RaCe rotatory systems. Materials and Methods: Seventy five mandibular molars were selected, with 15º to 45º angles in their mesio-vetibular canals. The roots were included in transparent resin using a plastic device. The specimens were distributed according to their angles in five groups: Group 1: Step-back technique with Flexo-Files, Group 2: Profile system; Group 3: Pro Taper system; Group 4: Race system and Group 5: control group. After instrumentation the roots were horizontally sectioned at the bifurcation level, where the curvature begins and at 3 mm from the apex. The least post operatory thickness of each mesial and distal root in the three cutting levels were measured. Results and Conclusions: The statistical analysis using the ANOVA test did not show significant thickness differences resulting form the different techniques at cervical, medium or apical leves (AU)


Assuntos
Humanos , Tratamento do Canal Radicular/métodos , Dentina/anatomia & histologia , Cemento Dentário/anatomia & histologia , Rotação , Preparo de Canal Radicular/instrumentação , Instrumentos Odontológicos
20.
Dentum (Barc.) ; 8(2): 68-73, abr.-jun. 2008. ilus
Artigo em Espanhol | IBECS | ID: ibc-78629

RESUMO

Introducción: La sensibilidad dentinaria es un motivo de consulta frecuente y los tratamientos disponibles no siempre ofrecen resultados satisfactorios a largo plazo. De aquí surge la necesidad de buscar nuevas alternativas de tratamiento. Objetivos: Evaluar mediante microscopio electrónico de barrido la capacidad de oclusión de los túbulos dentinarios de dos agentes desensibilizantes comercializados compuestos por carbonato y fosfato potásico y cloruro de estroncio y de calcio (TwinGel) y por fluoruro de estaño (Emoflúor).Material y métodos: Se seleccionaron 15 dientes de origen humano y se cortaron 2 discos de dentina de cada diente. Se grabó la superficie dentinaria con ácido ortofosfórico durante 70 segundos y se dividieron los discos en 2 grupos. Al primer grupo se le aplicó el agente desensibilizante compuesto por carbonato y fosfato potásico, cloruro de estroncio y de calcio y al segundo grupo fluoruro de estaño, ambos durante 3 minutos. Posteriormente se observó con microscopía electrónica de barrido la oclusión de los túbulos dentinarios y se realizaron fotografías a 10.000 aumentos. El porcentaje de obturación tubular fue analizado mediante escala visual analógica. Resultados: Para el grupo 1 (Twin Gel) obtuvimos un promedio de oclusión de los túbulos del 73%, y para el grupo 2 (Emofluor) un62%, tras aplicar el agente desensibilizante durante 3 minutos. Discusión y conclusiones: Ambos tienen capacidad para ocluirlos túbulos dentinarios, sin embargo, la aplicación del producto desensibilizante Twin Gel sobre la superficie de dentina produce la oclusión de más de 2/3 partes de la superficie a tratar (AU)


Introduction: Dentinal sensitivity is a common problem. Although there have been described several treatments for this particular entity, none of them has offered the right solution for an extended period of time; for this reason, it is necessary to find new treatment alternatives. Aim: To evaluate the occlusion of dentinal tubules with two desensitizing agents “Twin Gel” (potassium carbonate and phosphate, strontium and calcium chloride) and “Emoflúor” (stannous chloride)using Scanning electron microscopy (SEM).Material and methods: 15 human teeth free of caries and restorations were used in this study. Two discs of each tooth were obtained and etched with ortophosphoric acid 37%. Discs were divided in2 groups. In the first group, a desensitizing agent with potassium carbonate, phosphate and strontium and calcium chloride was applied; in the second group, stannous chloride was used, both for 3minutes. Then, the occlusion of dentinal tubules was observed using SEM at 10.000 X. Percentages of tubular sealing were measured using a analogical visual scale. Results: For the group 1 (Twin Gel), an average of 73% of sealed tubuleswas observed, for the group 2 (Emofluor) a 63% was observed after application of desensitizing agent for 3 minutes. Conclusion: Both desensitizing agents have sealing capacity of dentinal tubules; however, the application of the “TwinGel” desensitizing agent on dentin surface, has an increased capacity of more than 2/3 parts of the treated surface (AU)


Assuntos
Humanos , Microscopia Eletrônica de Varredura , Dentina , Dentina/ultraestrutura , Carbonatos/farmacologia , Fosfatos/farmacologia , Cloretos/farmacologia , Estrôncio/farmacologia , Oclusão Dentária
SELEÇÃO DE REFERÊNCIAS
DETALHE DA PESQUISA