Fracture resistance of endodontically treated teeth with cervical defects using different restorative treatments

Journal of Dental Sciences

Wei Bai¹  Yu-Hong Liang²  Yi-Bai Guo³ 

[1]National Clinical Research Center for Oral Diseases &

[2]National Engineering Laboratory for Digital and Material Technology of Stomatology &

[3]Department of Cariology and Endodontology, Peking University School and Hospital of Stomatology &

关键词: Cervical defect;    Dental restoration;    Permanent;    Tooth;    Nonvital;    Compressive strength;   

DOI  :  

来源: DOAJ

【 摘 要 】

Background/purpose: The restoration of endodontically treated teeth (ETT) with cervical defects has been a challenge for dentists. The purpose of this study was to evaluate the effect of restorative treatment on the fracture resistance of ETT with cervical defects. Materials and methods: One hundred and twenty freshly extracted human intact straight-single-root maxillary premolars were randomly divided into 6 groups. Group 1 remained untreated. Cervical defects of 4 mm-depth and 3 mm-height were created in groups 2–6. Group 3–6: root canal treatment. Group 4: direct composite resin restoration. Group 5: 2-mm full-cusp-coverage composite resin restoration. Group 6: fiber-post-supported composite resin restoration. A static fracture test was used to determine the fracture resistance of teeth under axial (n = 10) and palatal (30°) (n = 10) loading. Fracture modes were categorized as restorable and unrestorable. Results: Compared with intact teeth, the axial fracture resistance of teeth with cervical defects decreased by approximately 39%, and endodontic procedures resulted in 10% more reduction. When ETT with cervical defects were restored using direct composite resin filling, the axial fracture resistance recovered to 72% of that of intact teeth, but no significant change occurred under oblique loading. After full-cusp-coverage or fiber-post-supported restoration, fracture resistance showed complete recovery to the value of intact teeth (P > 0.05). Sixty percent of fractures were unrestorable for fiber-post-supported teeth, while in the full-cusp-coverage restoration group, 80–90% of fractures were restorable. Conclusion: Full-cusp-coverage restoration or fiber-post-supported restoration could improve the fracture resistance of ETT with cervical defects, whereas unrestorable fractures easily occurred in fiber-post-supported restorations.

【 授权许可】

Unknown