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1.
Indian J Dent Res ; 31(4): 579-584, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-33107460

RESUMO

Aims: To evaluate and compare the efficacy of four rotary instrumentation systems in root canal retreatment and to determine retreatment time. Materials and Methods: To achieve the purpose of this study, canals of 60 distal roots in mandibular molar teeth were selected and randomly divided into four groups A, B, C and D (n = 15). Using step-back technique, the canals were prepared and filled with gutta-percha and AH Plus employing cold lateral compaction technique. The root filling material was removed with the following retreatment systems: Group A: Mtwo R, group B: D-RaCe, group C: ProTaper R and group D: R-Endo. In order to record retreatment time, a stopwatch was used. The samples were split longitudinally, examined under a stereomicroscope, photographed and assessed with AutoCAD software. Finally, the percentages of remaining filling material were calculated and the extracted data were analyzed using one-way ANOVA and Tukey HSD test. Results: All examined groups showed traces of remaining filling material within the canals. No statistically significant difference was found among the four groups in the coronal, middle, and apical thirds. The same result was obtained with regard to retreatment time (P > 0.05). However, within each one of the groups, significant difference was observed in the three regions (P < 0.05). Conclusions: Based on the findings of this study, none of the examined systems could completely remove root filling material from the root canals. However, they were all found to be effective in this regard. The most amount of remaining filling material was found in the apical third.


Assuntos
Guta-Percha , Materiais Restauradores do Canal Radicular , Cavidade Pulpar , Níquel , Retratamento , Preparo de Canal Radicular , Titânio
2.
Int J Comput Dent ; 22(3): 273-281, 2019.
Artigo em Inglês | MEDLINE | ID: mdl-31463491

RESUMO

This case report describes the digital and clinical workflow of a guided endodontic access approach in a mandibular central incisor with pulp canal calcification (PCC). The access to the remaining pulp space was planned virtually using cone beam computed tomography (CBCT) and the Sicat Endo software (Sicat, Bonn, Germany). Sicat produced the corresponding Accessguide after matching a digitized cast model and the virtual treatment plan. The clinical access was prepared using a carbide bur with a diameter of 1.2 mm. After the root canal was localized successfully, it was disinfected chemomechanically, dried, and obturated using a warm vertical compaction technique.


Assuntos
Cavidade Pulpar , Incisivo , Tomografia Computadorizada de Feixe Cônico , Alemanha , Humanos , Tratamento do Canal Radicular , Software
3.
Swiss Dent J ; 127(3): 221-229, 2017.
Artigo em Inglês | MEDLINE | ID: mdl-28480947

RESUMO

An important part of endodontic diagnosis and treatment is the adequate visualization of root canal anatomy. The objective of the present study was to compare two different three-dimensional cone-beam computed tomography (CBCT) systems, Scanora 3D and 3D Accuitomo 170, with respect to their visualization of endodontic canal systems and potential pathological alterations. Seventy extracted human teeth were investigated with regard to the radiographic detection of number of root canals, lateral canals, root canal fillings and posts, vertical root fractures, and the occurrence of image artifacts. For each evaluation parameter under investigation the radiographic diagnoses obtained by the two different CBCT systems under investigation were similarly accurate, without statistically significant differences. The evaluation of teeth containing highdensity foreign materials was impaired for both CBCT systems because of image artifacts. However, a difference between the CBCT systems was not observed. In conclusion, both CBCT systems were found to be similarly suitable for the visualization of endodontic structures in vitro.


Assuntos
Tomografia Computadorizada de Feixe Cônico/instrumentação , Cavidade Pulpar/diagnóstico por imagem , Endodontia/instrumentação , Imageamento Tridimensional/instrumentação , Artefatos , Desenho de Equipamento , Humanos , Sensibilidade e Especificidade
4.
Quintessence Int ; 48(4): 273-280, 2017.
Artigo em Inglês | MEDLINE | ID: mdl-27834415

RESUMO

OBJECTIVE: The aim of the present study was to evaluate the antimicrobial influence of different root canal filling techniques using gutta-percha and an epoxy resin-based sealer in experimentally infected root canals of extracted human teeth. METHOD AND MATERIALS: In total, 96 intact sterilized, permanent human anterior teeth and premolars with single patent root canals were prepared and infected with a clinical isolate of Enterococcus faecalis. After 72 hours, all root canals were sampled using three sterile paper points. The tooth specimens were randomly divided into three groups and a control of 24 specimens each, according to the respective obturation techniques: lateral condensation (LC group), ProTaper Thermafil (PT group), and vertical compaction technique (VC group). AH Plus was used as sealer. The control group was left untreated (without root canal filling). After 7 days root canal fillings were removed and collected. The root canals were sampled using three sterile paper points and dentin chips were obtained from the root canal walls. The samples were cultured on blood agar, and colony forming units were counted. RESULTS: All root canal filling techniques significantly reduced bacterial viability, eliminating more than 99.9% of E faecalis. In the LC group, three (13%) root canals were culture negative. In the PT group, 21 (88%) root canals and in the VC group 15 (54%) were culture negative. CONCLUSION: All root canal filling techniques significantly reduced E faecalis in root canals. In cases where warm filling techniques can be applied, these should be preferred to cold obturation.


Assuntos
Antibacterianos/farmacologia , Cavidade Pulpar/efeitos dos fármacos , Cavidade Pulpar/microbiologia , Resinas Epóxi/farmacologia , Guta-Percha/farmacologia , Materiais Restauradores do Canal Radicular/farmacologia , Preparo de Canal Radicular/métodos , Contagem de Colônia Microbiana , Resinas Compostas , Ácido Edético/farmacologia , Enterococcus faecalis , Humanos , Técnicas In Vitro , Distribuição Aleatória , Cimentos de Resina , Obturação do Canal Radicular , Hipoclorito de Sódio/farmacologia
5.
J Dent Educ ; 79(11): 1363-72, 2015 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-26522643

RESUMO

The aims of this study were to develop an endodontic simulation model able to implement the electronic method of working length determination (electronic apex locators, EALs) in a dental school, to evaluate the practicality of this tool for dental students, and to compare the accuracy of working length measurements achieved by the EAL and the radiographic method. A new simulation model was constructed by embedding extracted human teeth in a self-cured resin, along with a conductive medium. After radiographic and electronic working length determinations, root canal instrumentation was performed by students at a dental school in Austria according to the working lengths obtained from the EAL. Subsequently, root apices (n=44) were longitudinally sectioned using a diamond coated bur. Measurements of the distance between the anatomical root apex (ARA) and the apical constriction (AC) as well as between ARA and the ascertained apical point of endodontic instrumentation were performed using digital photography and a 3D computer-assisted design software. The distance between ARA and the radiologic (ARA-R) or electrometric (ARA-EL) readings of the apical point of endodontic instrumentation was compared with the actual distance ARA-AC. The accuracy of both methods was determined. The difference between the actual distance ARA-AC and the targeted radiological distance was statistically significant (p=0.0001), as was the measured distance between ARA-R and ARA-EL (p=0.016). The electronic method seems to be more precisely referring to the AC (R(2)=0.0198) than the radiographic method (R(2)=0.0019). These results suggest that the endodontic simulation model described in this study can be successfully used in preclinical dental education.


Assuntos
Modelos Dentários , Cavidade Pulpar/anatomia & histologia , Educação em Odontologia , Endodontia/educação , Estudantes de Odontologia , Materiais de Ensino , Ápice Dentário/anatomia & histologia , Desenho Assistido por Computador , Cavidade Pulpar/diagnóstico por imagem , Equipamentos e Provisões Elétricas , Marcadores Fiduciais , Humanos , Processamento de Imagem Assistida por Computador/métodos , Imageamento Tridimensional/métodos , Manequins , Odontometria/instrumentação , Odontometria/estatística & dados numéricos , Fotografia Dentária/métodos , Radiografia , Preparo de Canal Radicular/instrumentação , Preparo de Canal Radicular/estatística & dados numéricos , Ápice Dentário/diagnóstico por imagem
6.
BMC Oral Health ; 14: 132, 2014 Nov 04.
Artigo em Inglês | MEDLINE | ID: mdl-25366394

RESUMO

BACKGROUND: To determine the antibacterial effect of photodynamic Therapy on Enterococcus faecalis (E. faecalis) biofilms in experimentally infected human root canals in primary infections and endodontic retreatments. METHODS: One hundred and sixty single-rooted extracted teeth with one root canal were prepared using ProTaper instruments. Seventy specimens were left without root canal filling and autoclaved. The root canals of another 70 specimens were filled with Thermafil and AH Plus and the root canal fillings were removed after 24 hours using ProTaper D files and plasma sterilized. The specimens were infected with a clinical isolate of E. faecalis for 72 hours. Samples were taken using sterile paper points to determine the presence of E. faecalis in the root canals. The specimens were randomly divided into groups according to their treatment with 20 teeth each and a control. In the PDT group the teeth were treated using PDT, consisting of the photosensitizer toluidine blue and the PDT light source at 635 nm. In the NaOCl (sodium hypochlorite) group the root canals were rinsed with 10 mL of 3% NaOCl. In the NaOCl-PDT group the root canals were rinsed with 10 mL of 3% of sodium hypochlorite and then treated with PDT. Samples were taken after treatments using sterile paper points. Additionally, remaining root canal filling material was recovered from the root canal walls. Survival fractions of the samples were calculated by counting colony-forming units. A one-way analysis of variance (ANOVA) was applied to the data to assess the effect of different treatment techniques. RESULTS: Antimicrobial treatment of root canals caused a significant reduction of bacterial load in all groups. NaOCl irrigation eliminated E. faecalis most effectively. PDT alone was less effective compared to NaOCl irrigation and the combination of NaOCl irrigation and PDT. CFU levels recovered from the filling material after NaOCl irrigation of the root canals were 10fold higher compared to PDT and the combination of NaOCl irrigation and PDT. CONCLUSIONS: Photodynamic therapy killed E. faecalis in experimental primary endodontic infections and retreated human root canals. PDT is an effective supplement in root canal disinfection, especially in endodontic retreatments.


Assuntos
Biofilmes/efeitos dos fármacos , Cavidade Pulpar/microbiologia , Enterococcus faecalis/efeitos dos fármacos , Fotoquimioterapia/métodos , Carga Bacteriana/efeitos dos fármacos , Dentina/microbiologia , Combinação de Medicamentos , Resinas Epóxi/uso terapêutico , Guta-Percha/uso terapêutico , Humanos , Viabilidade Microbiana/efeitos dos fármacos , Microscopia Eletrônica de Varredura , Fármacos Fotossensibilizantes/uso terapêutico , Retratamento , Materiais Restauradores do Canal Radicular/uso terapêutico , Irrigantes do Canal Radicular/uso terapêutico , Preparo de Canal Radicular/métodos , Hipoclorito de Sódio/uso terapêutico , Cloreto de Tolônio/uso terapêutico
7.
Swiss Dent J ; 124(1): 11-5, 2014.
Artigo em Inglês | MEDLINE | ID: mdl-24585222

RESUMO

This communication presents the treatment of 15 cases of c-shaped canals in molars and their treatment outcome with two different obturation methods. The data from 901 patients who received root canal treatment in a molar tooth were examined regarding c-shaped root canals, their treatment and their status one year post op. Among the 901 cases, 15 molars had a c-shaped root canal morphology (1,66%). C-shaped canals occurred mainly in second mandibular molars (73,3%). The obturation was either performed with gutta-percha and sealer (5 cases) or with Mineral Trioxide Aggregate as apical plug (MTA; 10 cases). All cases reached a symptomless status clinically and 14 cases showed apical healing in the radiographic control.


Assuntos
Cavidade Pulpar/anatomia & histologia , Materiais Restauradores do Canal Radicular , Obturação do Canal Radicular/métodos , Preparo de Canal Radicular/métodos , Adulto , Idoso , Compostos de Alumínio , Compostos de Cálcio , Combinação de Medicamentos , Feminino , Guta-Percha , Humanos , Masculino , Pessoa de Meia-Idade , Dente Molar/anatomia & histologia , Óxidos , Estudos Retrospectivos , Silicatos , Resultado do Tratamento
8.
Clin Oral Investig ; 18(3): 745-51, 2014 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-23828194

RESUMO

OBJECTIVES: Caries excavation is still a demanding procedure today. In the past years, methods using light-induced fluorescence have proven their ability to detect bacteria remaining in the tooth's hard tissues. However, methods to control the complete removal of infected dentine have not yet been validated. The aim of the present study was to evaluate the degree of dentine removal during caries excavation using a camera- and software-based device as a guide for fluorescence-aided caries excavation (FACE) in comparison to visual-tactile inspection and a dye-staining method. MATERIALS AND METHODS: One hundred teeth with carious lesions (C3) were randomly allocated to four groups and excavated with the respective method as primary excavation control method. When the first method indicated complete caries excavation, a second method was used to affirm this. Subsequently, dentine samples were taken to determine residual contamination using PCR. After embedding and sectioning the teeth dentine, microhardness was measured perpendicular to the cavity floor. RESULTS: By using the camera- and software-based device, 94 % of the cavities tested were free of bacterial contamination. All cavities excavated with the dye-staining or visual-tactile control method were free of bacterial contamination but resulted in a significantly higher dentine removal. CONCLUSION: The camera- and software-assisted caries excavation seems to be an adequate method to remove contaminated dentine without removing affected dentine. CLINICAL RELEVANCE: Beside its original application to monitor carious, the device is safe, effective, and easy to use for guided caries excavation and is of worth for both everyday practice and undergraduate education.


Assuntos
Cárie Dentária/terapia , Terapia Assistida por Computador , Humanos
9.
J Dent ; 41(11): 1020-6, 2013 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-24007789

RESUMO

OBJECTIVES: Due to morphological differences along the root canal, serious structural damage, or extensive endodontic preparation, cement thickness of luted fibre-reinforced composite (FRC) post systems can largely vary. This study aimed at evaluating the effects of a self-etch (Multilink Automix, MLA) and various self-adhesive resin cements (G-Cem, GCM; Maxcem Elite, MXE; RelyX Unicem, RLX; SmartCem 2, SMC) on the pull-out bond strengths of FRC posts to root canal dentine, and to compare the effects of different cementation thicknesses. METHODS: 100 bovine incisor roots were embedded in acrylic resin and randomly assigned to two groups. Root canals of group 1 were prepared with RelyX Fiber Post drill size one (Ø 1.3mm), whereas in group 2 drill size three (Ø 1.9mm) was used to attain different cement thicknesses (thicknesses 1 and 2). Each group was then subdivided into five subgroups (n=10). RelyX Fiber Posts size one (Ø 0.70mm) were luted with the respective resin cements. All specimens were subjected to pull-out evaluation using a universal testing machine. Post surface areas covered with cement were measured by means of stereomicroscopy. RESULTS: RLX revealed the significantly highest pull-out bond strengths in both groups (p<0.05), while MXE exhibited the significantly lowest pull-out bond strengths in group 2 (p<0.05). Main failure modes were determined as adhesive at the cement-post surface for all examined groups (except for SMC, group 2). CONCLUSIONS: The different resin cements influenced the pull-out bond strengths, whereas the cement thickness itself was not responsible for any differences. CLINICAL SIGNIFICANCE: Self-adhesive resin cements can provide an acceptable retention of FRC posts even in case of use with wider post space conditions.


Assuntos
Cimentação/métodos , Resinas Compostas/química , Colagem Dentária , Materiais Dentários/química , Vidro/química , Técnica para Retentor Intrarradicular/instrumentação , Cimentos de Resina/química , Adesividade , Animais , Bovinos , Cavidade Pulpar/ultraestrutura , Análise do Estresse Dentário/instrumentação , Dentina/ultraestrutura , Teste de Materiais , Metacrilatos/química , Poliuretanos/química , Distribuição Aleatória , Estresse Mecânico , Propriedades de Superfície , Fatores de Tempo
10.
J Craniomaxillofac Surg ; 41(7): e128-36, 2013 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-23332471

RESUMO

Over the last decade tissue engineering has emerged as a key factor in bone regeneration within the field of cranio-maxillofacial surgery. Despite this in vivo analysis of tissue-engineered-constructs to monitor bone rehabilitation are difficult to conduct. Novel high-resolving flat-panel based volume CTs (fp-VCT) are increasingly used for imaging bone structures. This study compares the potential value of novel fp-VCT with conventional multidetector CT (MDCT) based on a sheep sinus floor elevation model. Calcium-hydroxyapatite reinforced collagen scaffolds were populated with autologous osteoblasts and implanted into sheep maxillary sinus. After 8, 16 and 24 weeks MDCT and fp-VCT scans were performed to investigate the volume of the augmented area; densities of cancellous and compact bone were assessed as comparative values. fp-VCT imaging resulted in higher spatial resolution, which was advantageous when separating closely related anatomical structures (i.e. trabecular and compact bone, biomaterials). Fp-VCT facilitated imaging of alterations occurring in test specimens over time. fp-VCTs therefore displayed high volume coverage, dynamic imaging potential and superior performance when investigating superfine bone structures and bone remodelling of biomaterials. Thus, fp-VCTs may be a suitable instrument for intraoperative imaging and future in vivo tissue-engineering studies.


Assuntos
Substitutos Ósseos/química , Tomografia Computadorizada Multidetectores/métodos , Levantamento do Assoalho do Seio Maxilar/métodos , Tomografia Computadorizada por Raios X/métodos , Animais , Apatitas/química , Autoenxertos/transplante , Densidade Óssea/fisiologia , Remodelação Óssea/fisiologia , Técnicas de Cultura de Células , Colágeno/química , Combinação de Medicamentos , Processamento de Imagem Assistida por Computador/métodos , Imageamento Tridimensional/métodos , Seio Maxilar/diagnóstico por imagem , Seio Maxilar/cirurgia , Tomografia Computadorizada Multidetectores/instrumentação , Osteoblastos/transplante , Distribuição Aleatória , Ovinos , Fatores de Tempo , Engenharia Tecidual/métodos , Tecidos Suporte/química , Tomografia Computadorizada por Raios X/instrumentação
11.
Clin Oral Investig ; 17(2): 449-54, 2013 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-22547323

RESUMO

OBJECTIVES: The aim of this study was to compare two different thermoplastic techniques--a core-carrier technique (Thermafil) and warm vertical compaction--in terms of overextension of root canal filling in vivo. MATERIALS AND METHODS: Flaring of 88 teeth was conducted using Pro Files .04 as finishing files, and the teeth were obturated using Thermafil. Flaring of 74 teeth was performed using Pro Files .06 as finishing files, and the teeth were obturated using warm vertical compaction. RESULTS: Seventy (80 %) of the teeth obturated using Thermafil and 31 (42 %) teeth obturated using warm vertical compaction show extruded root canal filling. In contrast to Thermafil, there is a higher rate of extruded root canal filling of teeth with more than one root canal using warm vertical compaction. CONCLUSION: Thermafil demonstrated a higher rate of extruded root canal filling compared to warm vertical compaction. Warm vertical compaction is a more predictable method of filling compared to Thermafil. CLINICAL RELEVANCE: Root canal filling extrusion will cause irritation of the surrounding tissue and impair repair processes. In the present in vivo study, there was a higher rate of root canal filling extrusion using Thermafil compared to warm vertical compaction.


Assuntos
Corpos Estranhos/etiologia , Guta-Percha/uso terapêutico , Tecido Periapical/patologia , Materiais Restauradores do Canal Radicular/uso terapêutico , Obturação do Canal Radicular/métodos , Resinas Compostas/química , Materiais Dentários/química , Cavidade Pulpar/patologia , Restauração Dentária Permanente/métodos , Ácido Edético/uso terapêutico , Resinas Epóxi/uso terapêutico , Corpos Estranhos/diagnóstico por imagem , Guta-Percha/efeitos adversos , Temperatura Alta , Humanos , Tecido Periapical/diagnóstico por imagem , Radiografia , Cimentos de Resina/química , Estudos Retrospectivos , Materiais Restauradores do Canal Radicular/efeitos adversos , Irrigantes do Canal Radicular/uso terapêutico , Preparo de Canal Radicular/instrumentação , Hipoclorito de Sódio/uso terapêutico , Ápice Dentário/patologia
12.
Quintessence Int ; 43(10): 901-6, 2012.
Artigo em Inglês | MEDLINE | ID: mdl-23115769

RESUMO

OBJECTIVE: To investigate the influence of chlorhexidine in different concentrations when mixed with mineral trioxide aggregate gray (MTA-G) or white (MTA-W). The antibacterial effect on Enterococcus faecalis was used as the primary parameter. METHOD AND MATERIALS: Similar to the agar diffusion test, Mueller-Hinton agar plates were inoculated with E faecalis (ATCC 19433), and 14 groups (n = 21) were prepared. The specimens consisted of MTA-W and MTA-G, and these were enriched with chlorhexidine concentrations of 0.1%, 0.2%, 0.5%, 1.0%, 1.5%, and 2.0%. Pure MTA-W and MTA-G (each combined with distilled water) were used as controls. After incubation periods of 24 and 48 hours, the inhibiting areolae were measured. RESULTS: Pure MTA-W, in contrast to pure MTA-G, had no bactericidal effects. With increasing chlorhexidine concentrations of up to 1.5%, a linear increase in bactericidal activity was observed. In contrast, MTA-G showed only a low self-bactericidal influence, and the antibacterial effects with increasing chlorhexidine concentrations were significantly lower than those of MTA-W (P < .001). CONCLUSION: When mixed with distilled water, pure MTA-G revealed a low bactericidal effect against E faecalis. The use of chlorhexidine with MTA mixtures leads to an antibacterial effect against E faecalis, and within the first 48 hours, this effect is significantly higher in combination with MTA-W when compared with MTA-G.


Assuntos
Compostos de Alumínio/farmacologia , Anti-Infecciosos Locais/farmacologia , Compostos de Cálcio/farmacologia , Clorexidina/farmacologia , Enterococcus faecalis/efeitos dos fármacos , Óxidos/farmacologia , Materiais Restauradores do Canal Radicular/farmacologia , Silicatos/farmacologia , Compostos de Alumínio/química , Anti-Infecciosos Locais/administração & dosagem , Compostos de Cálcio/química , Clorexidina/administração & dosagem , Combinação de Medicamentos , Óxidos/química , Materiais Restauradores do Canal Radicular/química , Silicatos/química
13.
J Endod ; 37(9): 1247-52, 2011 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-21846541

RESUMO

INTRODUCTION: Microbial adhesion and subsequent biofilm formation on endodontic root canal filling materials and sealers lead to survival of microorganisms in treated root canals and subsequently to endodontic treatment failures. The present study focused on initial microbial adhesion to different endodontic filling materials. METHODS: The following endodontic biomaterials were tested: AH-Plus, Tubli Seal, gutta-percha, Real Seal SE, EndoREZ, Apexit Plus, GuttaFlow, and dentin. Samples of each material were prepared. Bovine dentin samples were used as a control. The initial adhesions of salivary bacteria as well as the subsequent single species were quantified by determination of colony-forming units (CFUs) and visualized by scanning electron microscopy and confocal microscopy (CLSM): Enterococcus faecalis, Streptococcus mutans, Streptococcus sanguis, Candida albicans, and Prevotella nigrescens. RESULTS: Initially adherent microorganisms could be detected and microscopically visualized on each of the materials tested. Considering the values of the CFUs and the covering grade as detected by CLSM, there were significant differences among the materials. Fewer bacteria tended to adhere to Apexit Plus, whereas Real Seal SE and the widely used gutta-percha showed the highest number of adherent bacteria. This tendency was not detected for C. albicans. CONCLUSIONS: Endodontic microorganisms have a high affinity to root canal filling materials and sealers, especially to gutta-percha. Because of this high level of bacterial adhesion, subsequent biofilm formation on these materials could be suggested as leading to the persistence of microorganisms in root canals.


Assuntos
Aderência Bacteriana , Adesão Celular , Cavidade Pulpar/microbiologia , Dentina/microbiologia , Materiais Restauradores do Canal Radicular , Animais , Biofilmes , Candida albicans/fisiologia , Bovinos , Contagem de Colônia Microbiana , Falha de Restauração Dentária , Enterococcus faecalis/fisiologia , Microscopia Confocal
14.
J Endod ; 36(10): 1669-72, 2010 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-20850674

RESUMO

INTRODUCTION: An exact determination of the apical root canal diameter is crucial for correct cleaning and shaping of a root canal. The aim of this study was to investigate the discrepancies of the initial apical root canal diameter and the diameter that is measured by the initial apical file (IAF) after cervical flaring using current rotary nickel-titanium systems. METHODS: Mesiobuccal canals of 40 extracted mandibular molars were randomly assigned to four groups. In the first group, root canals were not flared. Root canals of the other groups were preflared using FlexMaster (VDW, Munich, Germany), ProTaper (Dentsply, Konstanz, Germany), or RaCe (FKG Dentaire, Genf, Switzerland) instruments. The tooth length was determined by inserting an ISO 06 K-file to the apical foramen. The working length (WL) was set 1 mm short of the apical foramen. File sizes were increased after binding sensation was felt at the WL. Transversal sections of the WL regions were examined under stereomicroscope, and the diameter of the root canal and the IAF at WL were assessed. RESULTS: Canals preflared with RaCe instruments had the lowest discrepancy between the apical root canal diameter and the IAF diameter (15.7 ± 9.7 µm) followed by ProTaper (22.2 ± 11.0 µm) and FlexMaster (35.0 ± 17.2 µm). CONCLUSIONS: Preflaring of root canals prevents underestimation of the actual apical root canal diameter. The type of instruments used for preflaring show differences on the accuracy of IAF determination. Preflaring with larger tapered instruments leads to a more accurate apical sizing, and this information is crucial concerning the appropriate final diameter for complete apical shaping.


Assuntos
Instrumentos Odontológicos , Cavidade Pulpar/anatomia & histologia , Preparo de Canal Radicular/instrumentação , Preparo de Canal Radicular/métodos , Ápice Dentário/anatomia & histologia , Ligas Dentárias , Desenho de Equipamento , Humanos , Mandíbula , Dente Molar , Níquel , Odontometria , Estatísticas não Paramétricas , Titânio
15.
Schweiz Monatsschr Zahnmed ; 120(2): 104-13, 2010.
Artigo em Inglês, Alemão | MEDLINE | ID: mdl-20238282

RESUMO

Studies on the compatibility of abrasives and fluoride compounds deal exclusively with fluoride uptake and remineralization after storing the enamel specimens in a toothpaste-saliva mixture. The influence of brushing on the fluoride uptake when highly abrasive toothpastes are used has hardly been investigated so far. The aim of the present study was to investigate fluoride uptake in initially demineralised dental enamel after storage in, or brushing with, whitening toothpaste slurries, compared to a conventional toothpaste. For this purpose two widely available whitening toothpastes with ionically bound fluoride (sodium fluoride NaF), two with covalently-bound fluoride toothpastes (sodium monofluorophosphate, NaMFP) and a conventional amine fluoride toothpaste (AmF) were compared. The fluoride uptake after use of the AmF toothpaste was shown to be statistically significantly higher than that after application of the NaF toothpastes, which in turn was statistically significantly higher than the uptake resulting from NaMFP application. The fluoride uptake was slightly higher when the enamel samples were brushed with NaF toothpaste, rather than just stored in the respective toothpaste slurry. Brushing with highly abrasive toothpastes did not negatively influence fluoride uptake in demineralised dental enamel. The ionic form of the fluoride in toothpastes appears to be critical for increased fluoride uptake. The acidic components of the AmF toothpaste improved fluoride uptake compared to alkaline NaF toothpastes.


Assuntos
Cariostáticos/farmacocinética , Esmalte Dentário/metabolismo , Fluoretos/farmacocinética , Desmineralização do Dente/metabolismo , Cremes Dentais/farmacocinética , Animais , Cariostáticos/química , Bovinos , Esmalte Dentário/patologia , Fluoretos/química , Fluoretos Tópicos/farmacocinética , Fosfatos/farmacocinética , Saliva/química , Fluoreto de Sódio/farmacocinética , Clareadores Dentários/farmacocinética , Remineralização Dentária , Escovação Dentária/métodos , Cremes Dentais/química
16.
Am J Dent ; 23(4): 188-92, 2010 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-21250566

RESUMO

PURPOSE: To evaluate the effect of casein phosphopeptides (CPP) and amorphous calcium phosphate (ACP), as an adjunct to average oral hygiene, on the fluorescence of initial carious fissures and pits in vivo. METHODS: For this investigator-blind in vivo study 32 volunteers were recruited. Subjects with premolars and molars showing DIAGNOdent-values between 15 and 20 were randomly assigned to two treatment groups. During a wash-out period of 2 weeks and during the 3-week treatment period all subjects were instructed to use only standard fluoride toothpaste (1450 ppm F- as NaF) and to abstain from any oral hygiene products other than dental tape. During the treatment period, one group additionally applied a CPP-ACP containing cream on the respective fissures for 3 minutes, once per day. At Days 1, 8, 15, and 22, DIAGNOdent measurements and a visual assessment of the fissures were performed by two calibrated independent examiners. RESULTS: No significant changes of DIAGNOdent values were found in the control group during the study period. Fissures additionally treated with the CPP-ACP containing cream showed significantly lower laser fluorescence values after Day 15 (P = 0.001) and Day 22 (P < 0.001) compared to the control group. No significant difference in the visual classification between the two groups could be found.


Assuntos
Cariostáticos/uso terapêutico , Caseínas/uso terapêutico , Cárie Dentária/prevenção & controle , Fissuras Dentárias/prevenção & controle , Adulto , Dente Pré-Molar/efeitos dos fármacos , Dente Pré-Molar/patologia , Cárie Dentária/patologia , Fissuras Dentárias/patologia , Feminino , Fluorescência , Seguimentos , Humanos , Masculino , Dente Molar/efeitos dos fármacos , Dente Molar/patologia , Higiene Bucal , Método Simples-Cego , Fluoreto de Sódio/uso terapêutico , Remineralização Dentária/métodos , Escovação Dentária , Cremes Dentais/uso terapêutico , Adulto Jovem
17.
Dent Mater ; 25(9): 1104-8, 2009 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-19427029

RESUMO

OBJECTIVES: To evaluate the degree of cure (%DC) of four self-etching, self-adhesive resin cements, and one conventional resin cement, in their self- and dual-curing mode. METHODS: The self-etching, self-adhesive resin cements studied were RelyX Unicem (3M ESPE AG), Maxcem (Kerr Corporation), Biscem (Bisco, Inc.) and Multilink Sprint (Ivoclar Vivadent AG) and the classic resin cement was Multilink Automix (Ivoclar Vivadent AG). Twelve specimens of each material (1.8 mm x 4 mm x 4 mm) were prepared in room temperature (23+/-1) degrees C following the manufacturers' instructions. Six of them were treated as dual-cured, thus irradiated for 20 s with a halogen light curing unit and left undisturbed for 5 min. The other six were treated as self-cured and were not irradiated, but left in dark and dry conditions for 10 min. The assessment of the %DC was made using micro-ATR FTIR spectrometry. RESULTS: The %DC in their self-curing mode was very low (10.82-24.93%), with Multilink Sprint exhibiting the highest values among the five. In the dual-curing mode the values obtained were also low (26.40-41.52%), with the exception of Multilink Automix (61.36%). Maxcem was found to have the lowest DC. SIGNIFICANCE: The low %DC found raises questions as to whether these materials can be successfully used in clinical applications, where light attenuation takes place. Increased irradiation times could potentially lead to higher %DC, in applications where light is not completely blocked by the overlying restoration.


Assuntos
Cimentos de Resina , Autocura de Resinas Dentárias , Corrosão Dentária/métodos , Dureza , Teste de Materiais/métodos , Espectroscopia de Infravermelho com Transformada de Fourier
18.
J Endod ; 35(2): 261-4, 2009 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-19166786

RESUMO

The objective of this study was to compare the quality of Guttaflow (Coltene/Whaledent, Langenau, Germany), Resilon/Epiphany (Jeneric/Pentron, Kusterdingen, Germany), and EndoREZ (Ultradent Products, Inc, South Jordan, UT) root canal fillings. Thirty single-rooted teeth were randomly assigned to three groups: Resilon/Epiphany, EndoREZ, and Guttaflow. After radiography of the root canal fillings, the roots were sectioned horizontally at the level of 2 mm and 4 mm from the apex. The area of voids and adaptation to canal walls and points were evaluated using light microscopy and calculated through a computer program. The radiographs showed no significant differences between the materials (p > 0.05, Mann-Whitney U test). Evaluation of cross-sections revealed sealer adaptation >99% to the root canals and >98% to the points. Resilon/Epiphany had significantly higher values at 98.8% (standard deviation [SD] = 3.9%) than EndoREZ at 98.7% (SD = 1.1%), and Guttaflow at 98.5 (SD = 2.1%) (p < 0.05, Mann-Whitney U test). The absolute difference compared with Resilon/Epiphany was at 0.84% (0.44%-1.76%) for EndoREZ and at 1.08% for Guttaflow (0.00%-2.08%) (95% confidence interval, Hodges-Lehman). This outcome indicated an effective apical obturation using any of the three materials in combination with a noncompaction technique.


Assuntos
Materiais Restauradores do Canal Radicular , Obturação do Canal Radicular/métodos , Ápice Dentário/diagnóstico por imagem , Resinas Compostas , Dimetilpolisiloxanos , Combinação de Medicamentos , Guta-Percha , Humanos , Teste de Materiais , Radiografia
19.
Quintessence Int ; 40(2): 103-12, 2009 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-19169441

RESUMO

OBJECTIVE: To compare in vitro the remineralizing effects of different regular dentifrices and whitening dentifrices (containing pyrophosphates) on predemineralized enamel. METHOD AND MATERIALS: Specimens from 84 bovine incisors were embedded in epoxy resin, partly covered with nail varnish, and demineralized in a lactic acid solution (37 degrees C, pH 5.0, 8 days). Parts of the demineralized areas were covered with nail varnish, and specimens were randomly assigned to 6 groups. Subsequently, specimens were exposed to a remineralizing solution (37 degrees C, pH 7.0, 60 days) and brushed 3 times a day (1:3 slurry with remineralizing solution) with 1 of 3 regular dentifrices designed for anticaries (group 1, amine; group 2, sodium fluoride) or periodontal (group 3, amine/stannous fluoride) purposes or whitening dentifrice containing pyrophosphates (group 4, sodium fluoride). An experimental dentifrice (group 5, without pyrophosphates/fluorides) and a whitening dentifrice (group 6, monofluorophosphate) served as controls. Mineral loss and lesion depths were evaluated from contact microradiographs, and intergroup comparisons were performed using the closed-test procedure (alpha =.05). RESULTS: Compared to baseline, specimens brushed with the dentifrices containing stannous/amine fluorides revealed significant mineral gains and lesion depth reductions (P < .05). Concerning the reacquired mineral, the whitening dentifrice performed worse than the regular dentifrices (P > .05), while mineral gain, as well as lesion depth, reduction was negligible with the control groups. CONCLUSION: Dentifrices containing pyrophosphates perform worse than regular dentifrices but do not necessarily affect remineralization. Unless remineralizing efficacy is proven, whitening dentifrices should be recommended only after deliberate consideration in caries-prone patients.


Assuntos
Dentifrícios/uso terapêutico , Desmineralização do Dente/terapia , Remineralização Dentária/métodos , Animais , Cariostáticos/uso terapêutico , Bovinos , Esmalte Dentário , Dentifrícios/química , Difosfatos/uso terapêutico , Fluoretos/uso terapêutico , Microrradiografia , Microscopia de Polarização , Distribuição Aleatória
20.
Schweiz Monatsschr Zahnmed ; 117(9): 947-56, 2007.
Artigo em Francês, Alemão | MEDLINE | ID: mdl-17966931

RESUMO

Enamel microabrasion is a proven method of removing superficial intrinsic enamel discoloration defects from teeth. In many cases, with insignificant and unrecognizable loss of enamel, those defects can be permanently eliminated, improving the appearance of treated teeth. This article describes the treatment of one patient whose fluorotic brown stains were corrected with a combination of enamel microabrasion and in-office-bleaching technique with a hydrogen peroxide gel solution.


Assuntos
Microabrasão do Esmalte , Fluorose Dentária/terapia , Clareamento Dental/métodos , Adolescente , Humanos , Peróxido de Hidrogênio/uso terapêutico , Incisivo , Masculino , Maxila , Oxidantes/uso terapêutico
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