Introduction. The aim of this study was to evaluate the fracture resistance of endodontically treated mandibular molars using traditional and conservative access cavity preparation. Materials and Methods. In this in vitro study, 100 extracted healthy human mandibular molars were selected and divided into 10 groups ( n = 10 ). Healthy teeth in one group were considered the control group. In three groups, traditional access cavity preparation was done (groups A) without two marginal ridges (A1), with one marginal ridge (A2), and with two marginal ridges (A3). In three groups (group B), two separate access cavities with a dentinoenamel roof without two marginal ridges (B1), with one marginal ridge (B2), and with two marginal ridges (B3) were prepared. In three other groups (groups C), two separate access cavities were prepared only with a dentinal roof without two marginal ridges (C1), with one marginal ridge (C2), and with two marginal ridges (C3), on which root canal treatment was performed afterward. Then, these teeth were subjected to force until fracture. The fracture force and fracture mode of each tooth were recorded and compared between groups by ANOVA, Tukey’s post hoc, and chi-square tests using SPSS ver. 23 (IBM, Somers, NJ, USA). Results. The control teeth had the highest mean fracture force ( 2804.5 ± 338.5 N), followed by a conservative access cavity with a dentinoenamel roof and two marginal ridges ( 2360.4 ± 181.72 N) and a conservative access cavity with a dentinoenamel roof and one marginal ridge ( 1812.8 ± 263.9 N), respectively. The lowest mean fracture force was found for the conventional access cavity group without two marginal ridges ( 399.4 ± 95.2 N). Conclusion. In the condition of this study, with two separate access cavities in mandibular molars and maintenance of the marginal ridges, it is possible to provide teeth with higher fracture resistance against occlusal forces.
Objectives. Given the high prevalence of the coronavirus and the high risk of virus transfer to dentists, the use of mouthwashes, which can potentially eliminate this virus, is suggested before dental procedures. Since these mouthwashes may affect the bond strength of composite resin restorations to teeth, this study was conducted to investigate the effect of recommended mouthwashes on the shear bond strength of composite resin restorations to dentin and enamel in selective etch and rinse and two-step self-etch bonding systems. Methods. Five groups of posterior teeth ( n = 15 ) were selected for five groups of cetylpyridinium chloride 0.07%, povidone-iodine 1%, hydrogen peroxide 1%, and chlorhexidine 0.2% as mouthwash and distilled water as the control group. The buccal enamel and lingual dentin of each tooth were rinsed after immersion in a mouthwash. After 20 seconds of enamel acid-etching and 15 seconds of dentin priming, they were impregnated with an adhesive, and composite cylinders were placed on the dentin and enamel surfaces of the tooth. The shear bond strength test was performed after 24 hours, and results were analyzed by ANOVA and paired t -test ( α = 0.05 ). Results. The mean shear bond strength of enamel to composite was significantly ( p < 0.05 ) higher than that of dentin to composite in each study group, but no significant difference was found between the mean shear bond strength of composite to enamel ( p = 0.199 ) and to dentin ( p = 0.335 ) after the use of mouthwashes and that of the control group. Conclusion. The use of mouthwashes used in this study did not have negative effects on the shear bond strength of composite to enamel and dentin.
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