Assessment of a conservative approach for restoration of extensively destroyed posterior teeth

Journal of Applied Oral Science

关键词: Composite resins;    Dental cavity preparation;    Endodontically treated teeth;    Permanent dental restorations;   

DOI  :  10.1590/1678-7757-2018-0631

来源: DOAJ

【 摘 要 】

Abstract Extensive restorations in posterior teeth always bring doubts to the clinicians regarding the best protocol, mainly when structures of reinforcement were lost.ObjectiveThis study aimed to evaluate the effect of beveling on the fracture resistance and pattern of class II (MOD) restored teeth.MethodologyNinety human premolars were randomly assigned into 9 groups: CTR (control/sound); NC (cavity preparation, non-restored); RU (restored, unbeveled); RTB (restored, entire angle beveling); RPB (restored, partial/occlusal beveling); EC (endodontic access/EA, non-restored); EU (EA, unbeveled); ETB (EA, entire angle beveling); EPB (EA, partial/occlusal beveling). Teeth were restored with Esthet X resin composite and stored in distilled water for 24 h before the inclusion in PVC cylinders. The axial loading tests were performed with 500 kgF at 0.5 mm/min crosshead speed until fracture of the specimens. Fracture resistance and pattern were accessed and data were analyzed using one-way ANOVA and Tukey’s HSD test (α=0.05).ResultsMean (±SD) failure loads ranged from 136.56 (11.62) to 174.04 (43.5) kgF in the groups tested without endodontic access. For endodontically accessed teeth, fracture resistance ranged from 95.54 (13.05) to 126.51 (19.88) kgF. Beveling of the cavosurface angle promoted the highest fracture resistance values (p<0.05) and prevented catastrophic fractures.ConclusionsCavosurface angle beveling is capable of improving fracture resistance and pattern for both endodonticaly accessed and non-accessed teeth.

【 授权许可】

Unknown