Percepción de estudiantes respecto al recambio de restauraciones / Students' perception regarding the replacement of restorations

Introducción: El reemplazo de restauraciones defectuosas representa la mayor parte de la práctica del odontólogo, lo que lleva a una perdida mayor del remanente dentario ante cada reemplazo. Objetivo: Determinar si existe variación del criterio clínico en alumnos frente a la decisión de recambio en restauraciones de resina compuesta previo y posterior al reacondicionamiento. Material y Métodos: Estudio analítico transversal. Se contó con una muestra de 40 estudiantes de quinto año de un universo de 72. Se utilizó un set fotográfico, que contaba con restauraciones defectuosas, en uno o más parámetros según los criterios RYGE/USPHS, las cuales posteriormente se reacondicionaron, por lo que se contaba con las fotografías del antes y del después del tratamiento conservador. Se realizó una encuesta a partir de las fotografías mostradas en la cual debían indicar la elección de tratamiento. Resultados: Se observó que hay una gran variación de elección de tratamiento previo a ser reparadas con tratamientos conservadores: 38 por ciento y no conservador de 62 por ciento y frente a la misma restauración de resina posterior a haber sido intervenida la elección de tratamiento conservador fue de 83 por ciento y no conservador 17 por ciento. Mediante el Test de McNemar se obtuvo un p<0.0001 entre elección de tratamiento conservador por sobre el no conservador posterior a haber sido realizada el reacondicionamiento de la restauración. Conclusiones: Existe un cambio en la percepción sobre la indicación de tratamiento de restauraciones defectuosas, a favor de una alternativa conservadora, después de que han sido intervenidas con procedimientos mínimamente invasivos(AU)

Introduction: The replacement of defective restorations, which leads to a greater loss of the dental remnant before each replacement, represents the large majority of the dentist's practice. Objective: To determine if there is any variation in students´ clinical criterion in relation to the decision of replacement of composite resin restorations prior to and following reconditioning. Material and Methods: A cross-sectional analytical study was conducted. The sample was composed of 40 fifth-year students in a universe of 72. A set of photographs showing defective restorations in one or more parameters evaluated according to RYGE / USPHS criteria was used. They were later reconditioned, so there were photographs prior to and following conservative treatment. Based on the photographs shown, a survey in which they had to indicate the choice of treatment was performed. Results: We observed that there is a great variation in the choice of treatment prior to the repair with conservative treatments (38 percent) and non-conservative ones (62 percent), compared to the same resin restoration after the choice of conservative treatment (83 percent) and non-conservative one (17 percent). Using the McNemar Test, p<0.0001 was obtained between the choice of conservative treatment over the non-conservative one after the restoration reconditioning had been performed. Conclusions: There is a change in perception of the indication of treatment to repair defective restorations towards a conservative alternative after they have undergone minimally invasive procedures(AU)

Development and characterization of a novel bulk-fill elastomeric temporary restorative composite

Abstract Objectives: This study investigated the physical and mechanical properties, antibacterial effect and biocompatibility of novel elastomeric temporary resin-based filling materials (TFMs) containing zinc methacrylate (ZM). Material and Methods: Experimental TFMs were prepared by mixing the zinc methacrylate with monomer, co-monomer, photoinitiator and fillers. A ZM concentration of 0 (control), 0.5% (Z0.5); 1% (Z1), 2% (Z2), or 5% (ZM5) wt% was added to the TFMs. Fermit-N (F) was used for comparison with the experimental material. Microleakage, water sorption/solubility, degree of conversion, depth of cure, ultimate tensile strength, and hardness were determined and compared. A modified direct contact test (DCT) with Enterococcus faecalis and a Streptococcus mutans' biofilm accumulation assay was carried out to evaluate the antimicrobial effect and cytotoxicity of the assay. Statistical comparisons were performed (α=5%). Results: The results showed that the physical and mechanical properties of the experimental TFMs with ZM are comparable with the properties of the commercial reference and some properties were improved, such as lower microleakage and water sorption, and higher ultimate tensile strength values. TFMs with ZM killed E. faecalis only after 1 h. Biofilm development of S. mutans was not affected by the inclusion of ZM in the experimental TFMs. Conclusions: The present findings suggest that the physical, mechanical and biological properties of the experimental TFMs with ZM are comparable with the properties of the commercial reference. However, some properties were improved, such as lower microleakage and water sorption, and higher ultimate tensile strength values.

Evaluation of physical-mechanical properties, antibacterial effect, and cytotoxicity of temporary restorative materials

Abstract The objective of this study was to compare selective physical-mechanical properties, antibacterial effects and cytotoxicity of seven temporary restorative materials (TRM): five resin-based materials [Bioplic (B), Fill Magic Tempo (FM), Fermit inlay (F), Luxatemp LC (L) and Revotek LC (R)], and zinc oxide-eugenol cement (IRM) and glass ionomer cement (GIC) as the controls. Material and methods The physical-mechanical properties were evaluated by determining microleakage (ML), ultimate tensile strength (UTS) and Shore D hardness (SDH). In addition, the polymerization rate (Pr-1), depth of cure (DC), water sorption and solubility (WS/SL) were evaluated. The antimicrobial effects of the materials were assessed by biofilm accumulation of Streptococcus mutans (BT) and the direct contact test (DCT) by exposure to Enterococcus faecalis for 1 and 24 h, and cytotoxicity by MTT assay. The data were analyzed by ANOVA or Kruskall-Wallis tests, and a complementary post-hoc method (p<0.05). Results Group B, followed by FM and GIC had significantly lower percentages of microleakage in comparison with the other groups; Groups FM and L showed the highest WS, while Groups R and FM showed the significantly lowest SL values (p<0.05). Group R showed the statistically highest UTS mean and the lowest DC mean among all groups. Group F showed the lowest S. mutans biofilm accumulation (p=0.023). Only the Group L showed continued effect against E. faecalis after 1 h and 24 h in DCT. The L showed statistically lower viability cell when compared to the other groups. Conclusions These findings suggest the antibacterial effect of the temporary materials Fill Magic and Bioplic against S. mutans, while Luxatemp showed in vitro inhibition of S. mutans biofilm accumulation and E. faecalis growth. Regarding the cell viability test, Luxatemp was the most cytotoxic and Fill Magic was shown to be the least cytotoxic.

Uso de resina bisacrílica en la resolución estética en adolescente: caso clínico / The use of bisacrylic resin for the esthetic resolution in an adolescent: report of a clinical case

La estética constituye uno de los motivos de consulta de urgencia más frecuentes durante la adolescencia. Recientemente, fueron introducidos en el mercado, productos a base de resinas bisacrílicas. Tienen como componente principal metacrilatos multifuncionales con relleno de vidrio y/o sílice que constituyen la principal diferencia con los acrílicos convencionales. El objetivo de este trabajo es presentar un caso clínico de un paciente de 10 años de edad, resuelto en la Cátedra de Odontología Integral Niños de la Facultad de Odontología, Universidad de Buenos Aires, utilizando para la confección de restauraciones dentales temporales, una resina bisacrílica autopolimerizable.

Aesthetics is one of the most frequent reasons for urgent consultation during adolescence. Recently, products based on bisacrylic resins have been introduced on the market. They have as main component multifunctional methacrylates with filling of glass and / or silica that constitute the main difference with conventional acrylics. The objective of this work is to present a clinical case of a 10-year-old patient, resolved in the Chair of Integral Dentistry of the Faculty of Dentistry, University of Buenos Aires, using for the preparation of temporary dental restorations a bisacrylic resin self-cured.

Reconstrução de dentes para o tratamento endodôntico / Teeth reconstruction for endodontic treatment

O isolamento do campo operatório com o dique de borracha é fundamental para o tratamento endodôntico, porém alguns dentes se apresentam com grande destruição coronária, dificultando ou mesmo impedindo sua colocação. A reconstrução da coroa dentária por meio de resina fotoativada é um procedimento fácil de ser realizado e que, além de reforçar a coroa do dente, propicia maior facilidade para fazer o isolamento do mesmo. Este artigo descreve a técnica para a reconstrução da coroa dental, para isolamento do campo operatório com dique de borracha.

The use of rubber dam is vital for endodontic treatment, however some teeth present themselves with large coronary destruction hindering or even preventing the placement of the rubber dam. The reconstruction of dental crown using light-activated resin is a procedure that in addition to strengthening the crown of the tooth facilitates posterior isolation of the tooth. This article describes a technique for reconstruction of dental crown with the purpose of facilitating the use of rubber dam.

Effect of resin-modified glass-ionomer cement lining and composite layering technique on the adhesive interface of lateral wall

Interface integrity can be maintained by setting the composite in a layering technique and using liners. Objective The aim of this in vitro study was to verify the effect of resin-modified glass-ionomer cement (RMGIC) lining and composite layering technique on the bond strength of the dentin/resin adhesive interface of lateral walls of occlusal restorations. Material and Methods Occlusal cavities were prepared in 52 extracted sound human molars, randomly assigned into 4 groups: Group 2H (control) – no lining + two horizontal layers; Group 4O: no lining + four oblique layers; Group V-2H: RMGIC lining (Vitrebond) + two horizontal layers; and Group V-4O: RMGIC lining (Vitrebond) + four oblique layers. Resin composite (Filtek Z250, 3M ESPE) was placed after application of an adhesive system (Adper™ Single Bond 2, 3M ESPE) dyed with a fluorescent reagent (Rhodamine B) to allow confocal microscopy analysis. The teeth were stored in deionized water at 37oC for 24 hours before being sectioned into 0.8 mm slices. One slice of each tooth was randomly selected for Confocal Laser Scanning Microscopy (CLSM) analysis. The other slices were sectioned into 0.8 mm x 0.8 mm sticks to microtensile bond strength test (MPa). Data were analyzed by two-way ANOVA and Fisher's test. Results There was no statistical difference on bond strength among groups (p>0.05). CLSM analysis showed no significant statistical difference regarding the presence of gap at the interface dentin/resin among groups. Conclusions RMGIC lining and composite layering techniques showed no effect on the microtensile bond strength and gap formation at the adhesive interface of lateral walls of high C-factor occlusal restorations. .

Bandeira de broadrick para o restabelecimento do plano oclusal com utilização de prótese Overlay / Rehabilitation with Broadrick flag for restoring occlusal plane and use of type Overlay prosthesis

O correto restabelecimento da dimensão vertical de oclusão (DVO), do posicionamento mandibular e do nivelamento do plano oclusal devem ser requisitos básicos nas reabilitações onde houve um colapso oclusal. Porém, em muitos casos essas soluções requerem tratamentos complexos e de alto custo para a maioria da população. O presente trabalho teve como objetivo revisar os princípios envolvidos, indicação clínica, planejamento e execução, com o objetivo de discutir a viabilidade clínica e efetividade de próteses parciais removíveis (PPR) provisórias tipo Overlay e do nivelamento oclusal com o auxílio do dispositivo de Broadrick, identificando suas indicações, vantagens e desvantagens através da apresentação de um caso clínico. Concluiu-se que a PPR tipo Overlay pode ser indicada como alternativa de tratamento para pacientes com necessidade do nivelamento oclusal e do restabelecimento da DVO, podendo ser empregada como tratamento temporário ou definitivo; e o método de Broadrick pode ser útil na orientação da determinação da curva de Spee em pacientes com plano oclusal desequilibrado.

The correct restoration of vertical dimension of occlusion, the mandible positioning and leveling of the occlusal plane should be basic requirements in rehabilitation where there was a collapse occlusal. But in many cases these solutions require complex treatments and expensive for the vast majority of the population. This study aimed to review the principals involved, clinical indication, planning, in order to discuss the feasibility and clinical effectiveness of prosthesis type overlay and leveling the occlusal technique Broadrick, identifying their indications, advantages and disadvantages through the presentation of a clinical case. It was concluded that the overlay PPR may be an alternative treatment for patients in need of restoring the vertical dimension may be used as temporary or permanent treatment, and the method Broadlick may be useful in determining the orientation of the curve of Spee in patients with occlusal plane incorrect.

Colocación de implantes y provisionalización inmediata en el sector estético: manejo quirúrgico y rehabilitador. reporte de un caso clínico / Immediate Implant Placement and Provisionalization in the Esthetic Zone: Surgical and Prosthetic Management. Clinical Case Report

El tratamiento con implantes dentales ha demostrado ser predecible para reemplazar los dientes perdidos o defectuosos. Este caso clínico presenta un paciente con ausencia de las coronas de los incisivos centrales superiores. Luego de una evaluación clínica y radiográfica detallada del tejido blando y óseo, se realizaron las exodoncias de las raíces de los centrales superiores sin levantamiento de un colgajo, seguido de la colocación de 2 implantes, relleno óseo y provisionalización inmediata. Al paciente se le instruyó para que llevara una dieta blanda durante 3 semanas y fue evaluado semanalmente durante un mes y luego mensualmente durante un período de cicatrización de 4 meses. Después de la estabilización del tejido blando y duro, se procedió a la colocación de las coronas definitivas con aditamentos de zirconia. Los resultados que se pueden apreciar luego de la colocación de los implantes y la provisionalización inmediata en el sector estético anterior del maxilar superior nos indican un predecible grado de éxito con esta técnica. Por lo que podemos concluir que esta técnica puede ser aplicada y recomendada siempre y cuando exista un adecuado diagnóstico y protocolo de tratamiento que brinde una correcta selección del caso y asegure una tasa de éxito similar a otras técnicas.

Treatment with dental implants has shown to be a predictable treatment to replace defective or lost teeth. A clinical case is presented on a patient with absence of the crowns of the upper central incisors. After a detailed clinical evaluation of the bone and soft tissue, a root extraction without a flap elevation was performed, followed immediately by the insertion of two implants and provisional crowns and a bone graft. The patient was instructed to follow a soft diet for 3 weeks, and was followed up weekly for a month, and then monthly for a period of 4 months. After the stabilization of the soft and hard tissues, the final crowns using zirconia abutments were inserted. The results shown after placement of the immediate dental implants and provisionalization in the anterior esthetic zone of the maxilla demonstrate a predictable grade of success with this technique. In conclusion, this technique can be applied and recommended when there is an adequate diagnosis and treatment protocol that provides a correct selection of the case in order to ensure a rate of success similar to other techniques.

Uso de prótese fixa adesiva como mantenedor de espaço em dentes anteriores decíduos: um relato de caso / Use of fixed adhesive prosthesis as a space maintainer in anterior deciduous teeth: a case report

Apesar do curto período no qual os dentes decíduos permanecem na cavidade bucal, possuem um papel fundamental no crescimento e desenvolvimento da criança. A perda prematura dos dentes decíduos pode ocasionar vários problemas funcionais, psicológicos e sociais. Objetivo: O presente artigo relata um caso de perda precoce de incisivo central decíduo devido a um trauma. A criança possuía o hábito de colocar e pressionar a língua no espaço correspondente ao dente perdido. Foi proposta a manutenção do espaço com o auxílio de uma prótese fixa adesiva. Conclusão: A prótese fixa adesiva constitui uma solução prática para os casos de perda precoce de dentes anteriores decíduos, pois é de fácil execução, conservadora e preenche os requisitos funcionais e estéticos da criança...

Despite the short period that the deciduous teeth remain in the mouth, they have an important role in the growth and development of the child. The premature loss of deciduous teeth can cause several functional, psychological and social problems. Objective: This article reports a case of early loss of deciduous central incisor due to trauma. The child had a habit of pressing his tongue against the space corresponding to the missing tooth. It was proposed to maintain the space using a fixed adhesive prosthesis. Conclusion: The fixed adhesive prosthesis is a practical solution in cases of early loss of primary teeth since it is easy to perform, conservative and meets the functional and aesthetic requirements of the child...

Minimally invasive use of coloured composite resin in aesthetic restoration of periodontially involved teeth: case report

Gingival recession causes not only aesthetic problems, but problems with oral hygiene, plaque accumulation, speech, and tooth sensitivity. Replacing the missing gingival tissue with composite resin, when indicated, can be a time- and cost-effective solution. Here we report the case of a 25-year-old female who presented with generalized gingival recession. Black triangles were present between the maxillary and mandibular anterior teeth due to loss of interdental tissues, caused by recent periodontal surgery. She also had slightly malposed maxillary anterior teeth. The patient elected to replace gingival tissue with pink composite resin and to alter the midline with composite resin veneers. The first treatment phase involved placement of pink gingival composite to restore the appearance of interdental papilla to her upper [16, 15, 14, 13, 12, 11, 21, 22, 23, and 24] and lower [34, 33, 32, 31, 41, 42, 43, and 44] teeth. Phase two was to place direct composite resin bonded veneers on her upper [16, 15, 14, 13, 12, 11, 21, 22, 23, and 24] teeth to alter the midline and achieve desired colour. The third treatment phase was to level the lower incisal edge shape by enameloplasty [31, 32, 41, and 42] to produce a more youthful and attractive smile. This case report and brief review attempt to describe the clinical obstacles and the current treatment options along with a suggested protocol. Use of contemporary materials such as gingival coloured composite to restore lost gingival tissue and improve aesthetics can be a simple and cost-effective way to manage patients affected by generalized aggressive periodontitis [AgP]

Técnica indireta com resinas compostas para uso direto para restauração de dentes posteriores: preparo dentário, moldagem e provisório - parte I / Indirect technique with composite resins for direct use in restorations of posterior teeth: dental preparation, molding and provisional - part I

A utilização de sistemas adesivos autocondicionantes de dois passos em restaurações de dentes posteriores e para o selamento imediato da dentina, garante melhores resultados na resistência de união dente-prótese, diminui a sensibilidade dentinária e protege o complexo dentino-pulpar. As resinas fluidas aplicadas para regularização e forramento da cavidade são essenciais para diminuir as tensões geradas pelo estresse de contração. A confecção de restauração provisória é essencial para manutenção funcional do dente e, consequentemente, proteção das estruturas envolvidas

The use of adhesive systems self-etching of two steps in posterior restorations and for the immediate dentin sealing, ensures better results in the bond strength of tooth-prosthesis, decrease the sensitivity of dentin and protect the pulp-dentin complex. The fluid resins applied for regularization and lining of the cavity are essential to reduce the tensions generated by the shrinkage stress. Making the provisional restoration is essential for functional maintenance of the tooth and, consequently, protection of the structures involved

Coronal sealing ability of three temporary filling materials

Providing adequate coronal seal of temporary filling materials is critical for the success of root canal therapy. The aim of this in vitro study was to compare coronal seal ability of three restorative materials over different periods of time. Ninety-eight molar teeth were selected. Once access cavities were prepared, teeth were divided randomly into three time groups [1 day, 1 week, and 4 weeks]. Each group was then subdivided into three groups of 10 teeth. Each subgroup was restored using one of three restorative materials including Coltosol, Cavizol and Zonalin and then incubated in distilled water at 37[degree]C. The samples were then immersed in 2% methylene blue dye. After rinsing and drying, teeth were sectioned longitudinally and examined for dye penetration. Kruskal-Wallis and Mann Whitney U tests were used to analyze the data. All experimented materials showed increasing leakage from the 1[st] day to the 4[th] week. Zonalin showed more leakage than Coltosol and Cavizol at each time interval [P<0.05], but there was no significant difference between Coltosol and Cavizol. Coltosol and Cavizol are suitable temporary materials for up to 1 week

An interdisciplinary approach to reconstruct a fractured tooth under an intact all ceramic crown: Case report with four years follow up.

Trauma causing the fracture of a restored tooth with the extracoronal full coverage prosthesis remaining intact is a common occurrence in dental practice. Reconstruction of the damaged tooth foundation and recementation of the crown can pose quite a challenge for the restorative dentist. This case report describes an innovative interdisciplinary chairside technique for the recementation of an all-ceramic crown on a fractured maxillary central incisor. The course of care described is effective, affordable, and saves time in comparison with other treatment options for such clinical situations.

Avaliação dos contatos oclusais em próteses provisórias unitárias implantossuportadas confeccionadas com e sem arco facial / Evaluación de los contactos oclusales en prótesis temporales unitarias implantosoportadas montadas en articuladores semiajustables con arco facial / Assessment of occlusal contacts in implant-based single temporal prostheses in a semi-adjusted articulator using the facial arch

O presente estudo avaliou o número dos contatos oclusais obtidos em próteses provisórias unitárias sobre implantes posteriores, montadas em articulador semi-ajustável a partir da utilização de arco facial e de plano de Camper. Dez pacientes que procuraram uma clínica particular foram selecionados para confecção de próteses sobre implantes unitários previamente instalados. Para cada paciente foram confeccionadas duas próteses provisórias, obtidas sob diferentes condições: (1) montagem dos modelos utilizando arco facial e (2) montagem com plano de Camper. As próteses foram confeccionadas e ajustadas em laboratório, e instaladas por um único operador. Os contatos oclusais obtidos em cada condição foram evidenciados e fotografados, sendo então submetidos à avaliação e quantificação por um segundo profissional, cego para as condições de montagem. Os números obtidos foram submetidos ao teste de Mann Witney, e um nível de 5 por cento de significância foi utilizado. Não houve diferença estatisticamente significante entre os números de contatos oclusais, quando as próteses foram confeccionadas com arco facial ou plano de Camper (p> 0,05). Para confecção de próteses provisórias unitárias sobre implantes posteriores, o uso do plano de Camper para montagem em articulador não diferiu significantemente do arco facial, considerando o número de contatos oclusais(AU)

Este estudio evaluó el número de los contactos oclusales obtenidos en las prótesis temporales, montados en articulador semiajustable por el uso de arco facial y el plano de Camper. Diez pacientes que buscaron una clínica privada fueron seleccionados para las prótesis de implantes unitarios previamente instalados. Para cada paciente se hicieron dos prótesis temporales, que fueron obtenidas bajo condiciones diferentes: montaje de modelos con uso de arco facial y montaje con plano de Camper. Las prótesis fueron hechas, ajustadas e instaladas por un solo operador en el laboratorio. Los contactos oclusales obtenidos en cada condición fueron fotografiados y sometidos a la evaluación y cuantificación a través de un segundo profesional, ciego a las condiciones de montaje. Los números obtenidos fueron analizados mediante el examen de Mann-Whitney y un nivel de 5 por ciento de significación fue utilizado. No hubo diferencia estadísticamente significativa entre el número de contactos oclusales cuando las prótesis fueron hechas con arco facial o plano de Camper (p= 0,113). Para la confección de la prótesis dental temporal más tarde, el uso de montaje articular con plano de Camper no difirió significativamente del arco facial, respecto al número de contactos oclusales(AU)

To assess the number of occlusal contacts achieved in temporal prostheses mounted in a semi-adjusted articulator using the facial arch and the Camper plane. Ten patients treated in a private clinic were selected to be rehabilitated with prostheses in previously placed single implants. For each patient two temporal prostheses were designed obtained under different conditions: (1) model mounting using facial arch and (2) Camper plane mounting. Prostheses were made and adjusted in the laboratory and placed only by an operator. The occlusal contacts achieved in each condition were photographed being assessed and quantified by a second professional not involved with the mounting conditions. Results obtained were analyzed by Mann-Whitney test with a 5 percent significance level. There was not a statistically difference between the number of occlusal contacts when prostheses were made with facial arch or Camper plane (p= 0.113). The temporal dental prosthesis confection for single implants, semi-adjusted articulator using the Camper plane, not differ very much from the facial arch use, according to the number of resulting occlusal contacts(AU)

A chairside technique to preserve the anatomy of the pre-existing crown in immediate implant provisionalization: a case report / Una técnica de sillón para preservar la anatomía de la corona preexistente en provisionalización inmediata de implantes: presentación de un caso

The aim of this article is to describe a chairside method for immediate implant provisionalization, which preserves the original natural emergence profile and anatomy of the teeth.

El objetivo de este artículo es describir un método directo en el sillón de provisionalización inmediata del implante, que conserva el perfil de emergencia natural original y la anatomía de los dientes.

Comparação da qualidade de selamento periférico de diferentes materiais restauradores provisórios / Comparison of sealing ability of different temporary restorative materials

Diferentes materiais restauradores temporários podem ser utilizados durante tratamento endodôntico, porém é necessário possuir excelentes propriedades de selamento periférico. Assim, o objetivo deste estudo é comparar a infiltração marginal em diferentes materiais restauradores temporários. Cinquenta e dois molares superiores foram utilizados, onde cinquenta dentes foram abertos até a câmara pulpar, e divididos aleatoriamente: Grupo 1 foi restaurado utilizando-se Bioplic; Grupo 2 foi restaurado utilizando-se Cimpat rosa; Grupo 3 foi restaurado usando-se óxido de zinco e eugenol; Grupo 4 usando-se guta-percha, dois dentes hígidos formaram o grupo-controle negativo e dois dentes acessados e sem restauração foi o grupo controle-positivo. A raiz e o ápice dos dentes foram selados com esmalte, e todas as amostras imersas em azul de metileno a 2% e mantidos a 37º por 72 h. Assim, os dentes foram seccionados longitudinalmente e a infiltração linear medida em mm, sendo posteriormente aplicada análise estatística com teste de Kuskall Wallis e teste de Dunn. A maior infiltração ocorreu nos grupos 3 e 4, e as menores ocorreram no grupo 1 e 2 com diferença significante entre os grupos. Pode-se concluir que o Cimpat rosa e o Bioplic são materiais favoráveis no selamento coronário durante tratamento endodôntico.

Different temporary materials can be used to dental restoration during endodontic treatment, but it is necessaryan excellent sealing property, so the aim of this study is compare the leakage of temporary restorative materials.Fifty two third molars were used, which fifty teeth were opened through the pulp chamber, and randomly divided: group 1 was restored using Bioplic; group 2 was restored using Pink Cimpat; group 3 was restored using Zinc oxid eugenol; group 4 was restored using gutta-percha; two not opened teeth were negative control group, and two opened teeth no restored were positive control group. Then it was made completely impermeable of the root and apex of the teeth by varnish. All samples were immersed in 2% metylene blue and kept at 37ºC for 72h. After longitudinal sectioning the leakage was measured in mm and statistical analysis was performed using Kruskall Wallis and Dunn test. It was significant difference between groups, which greater linear leakeage on the groups 3 and 4, and less linear leakage on the groups 1 and 2. It can conclude that pink Cimpat and Bioplic are temporary restorative materials satisfactory on sealing ability during endodontic treatment.

Seal capability of interim post and core crown with temporary cements

The purpose of the present study was to evaluate the in vitro seal capability of interim post and core crown restorations. Eighty teeth were selected and divided into 8 groups. Four experimental groups received interim posts and core crowns. Half of each group was decoronated at the cementum-enamel junction, groups PCCH and PCZO. The other half was sectioned 2 mm coronal to the cementum-enamel junction, groups PCrZO and PCrCH. The interim post and core crowns were luted with Rely X Temp NE, groups PCrZO and PCZO; Hydro C was used for Groups PCrCH and PCCH. The control groups, PC and PCr, received uncoated post and core crowns; groups OTg and OT were left without interim post and core crowns and were totally open. Infiltration was accessed by dye exposure followed by demineralization of the teeth. The length of the infiltration was measured using digital images taken from the specimens. The images were inserted into the Image Tool 3.0 software. Kruskal-Wallis analysis of variance and Dunn's multiple comparison method were used to test for significant differences among test groups (P < .05). Groups PCrZO and PCrCH showed the least dye penetration, followed by groups PCZO and PCCH. Teeth restored with interim post and core crowns will be subject to leakage. Ethics Committee: 095/2008.

Coronal leakage of four intracanal medications after exposure to human saliva in the presence of a temporary filling material.

Aim: To determine the time required for the recontamination of root canals medicated with four different materials. Materials and Methods: A total of 60 intact, caries-free, human single-rooted teeth with straight roots were selected for this study. After chemo-mechanical preparation they must be changed in the specimens into seven groups: 10 teeth medicated with calcium hydroxide (Ca(OH) 2) + Camphorated paramonochlorophanol (CPMC) (G.1); 10 medicated with 2.5% Sodium hypochlorite (NaOCL) (G.2); 10 medicated with 2% Chlorhexidine gluconate (CHX) in gel (G.3); 10 medicated with 2% CHX in gel + Ca(OH) 2 (G.4); 10 without intracanal medicament and sealed with a coronal temporary filling (G.5). Five teeth were without intracanal medicament and coronally unsealed, used as the positive control group (PC) (G.6) and 5 teeth with intact crowns used as the negative control group (NC) (G.7). Glass vials with rubber stoppers were adjusted for use. The medicaments were prepared and injected into the root canals using sterile plastic syringes. An apparatus was used to evaluate for 30 days leakage. The chamber was filled with 3 ml of human saliva and Brain Heart Infusion (BHI) broth, incubated at 37°C and checked daily for the appearance of turbidity in the BHI broth. Results: Recontamination was detected after an average time of 2.6 days in group 2, 15.9 days in group 3, 30 days in group 1, 27.6 days in group 4, 2.9 days in group 5, 1 day in the positive control, and there was no contamination in the negative control group. Conclusion : The NaOCl group showed the highest worst average of recontamination; on the other hand, high averages were also shown by Ca(OH) 2 + CPMC and Ca(OH) 2 + 2% CHX in gel.

Bond strength of a composite resin to an adhesive luting cement

This study evaluated the influence of surface treatment on the shear bond strength of a composite resin (CR), previously submitted to the application of a temporary cement (TC), to an adhesive luting cement. Eight-four CR cylinders (5 mm diameter and 3 mm high) were fabricated and embedded in acrylic resin. The sets were divided into 6 groups (G1 to G6) (n=12). Groups 2 to 6 received a coat of TC. After 24 h, TC was removed and the CR surfaces received the following treatments: G2: ethanol; G3: rotary brush and pumice; G4: air-abrasion; G5: air-abrasion and adhesive system; G6: air-abrasion, acid etching and adhesive system. G1 (control) did not receive TC or any surface treatment. The sets were adapted to a matrix and received an increment of an adhesive luting cement. The specimens were subjected to the shear bond strength test. ANOVA and Tukeyʼs tests showed that G3 (8.53 MPa) and G4 (8.63 MPa) differed significantly (p=0.001) from G1 (13.34 MPa). The highest mean shear bond strength values were found in G5 (14.78 MPa) and G6 (15.86 MPa). Air-abrasion of CR surface associated with an adhesive system provided an effective bond of the CR to the adhesive luting cement, regardless the pre-treatment with the phosphoric acid.

A influência do tratamento de superfície sobre a resistência adesiva entre uma resina composta (RC), previamente submetida à aplicação de um cimento temporário (CT), e um cimento resinoso foi avaliada. Oitenta e quatro cilindros de RC (5 mm de diâmetro e 3 mm de altura) foram confeccionados e incluídos em resina acrílica. Os conjuntos foram divididos em 6 grupos (G1 a G6) (n=12). Os grupos de 2 a 6 receberam uma camada do CT. Após 24 h, o CT foi removido e as superfícies de RC receberam os seguintes tratamentos: G2: limpeza com etanol; G3: limpeza com escova rotatória e pedra pomes; G4: jateamento ; G5: jateamento e aplicação de adesivo; G6: jateamento, condicionamento ácido e adesivo. O G1(controle) não recebeu CT ou nenhum tratamento de superfície. Os conjuntos foram adaptados à matriz e receberam incremento de cimento resinoso. Os corpos de prova foram submetidos ao ensaio de cisalhamento. Os testes ANOVA e Tukey (p=0,001), demonstraram que os grupos G3 (8,53 MPa) e G4 (8,63 MPa) diferiram estatisticamente do grupo G1 (13,34 MPa). As maiores valores médios de resistência ao cisalhamento foram encontradas nos grupos G5 (14,78 MPa) e G6 (15,86 MPa). O jateamento da superfície da resina composta associado a um sistema adesivo, independente do pré-tratamento com o ácido fosfórico, proporcionou uma efetiva união ao cimento resinoso.