Fractographic analysis on fracture failure behavior of all-ceramic crowns

doi:10.12307/2021.065

Abstract

Abstract: BACKGROUND: In recent years, fractographic analysis has been applied to the study of fracture mechanics of ceramics. At present, most studies focus on the analysis of crack origin and propagation path of clinical fracture of all-ceramic crowns by using the typical crack characteristics of fractographic analysis, as well as the analysis of cyclic fatigue damage mode of all-ceramic crowns in vitro simulation state.
OBJECTIVE: The fractographic analysis was used to analyze the crack origin and related defects of all-ceramic crowns.
METHODS: From October 2018 to September 2019, a total of 12 patients with all-ceramic crowns fracture after failure in clinical use were selected from the Department of Stomatology, Eye&ENT Hospital of Fudan University. The stereomicroscope was used to observe the overall morphology of all-ceramic fracture section. The scanning electron microscope was used to observe the crack, surface damage and structural defects. The origin and propagation path of crack were deduced by the fractographic analysis. This trial was approved by the Ethics Committee of Eye & ENT Hospital of Fudan University.
RESULTS AND CONCLUSION: (1) Cyclic fatigue was an important reason for the fracture of all-ceramic restorations. Different types of cyclic fatigue damage modes could be observed in 12 fractured pieces of all-ceramic crowns, such as cone crack, veneer chipping, veneer delamination, radial crack, and surface defects. Different all-ceramic crowns had different dominant fatigue damage modes. (2) Cyclic fatigue damage was an important reason for the failure of all-ceramic crowns, among which radial crack was the main mode. The thickness of porcelain layer and core/veneer thickness ratio have a close influence on its occurrence. The interface between veneer and core is the weak link of double-layer all-ceramic restorations. Structural defects and stress concentration caused by abnormal occlusion are potential risk factors for failure of all-ceramic crowns.

Key words: materials, oral cavity, all-ceramic crown, dental porcelain, clinical failure, crack, fractographic analysis

CLC Number:

Bao Xinlian, Su Yi. Fractographic analysis on fracture failure behavior of all-ceramic crowns[J]. Chinese Journal of Tissue Engineering Research, 2021, 25(28): 4504-4509.

Figures/Tables 9

References

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