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논문 기본 정보

자료유형
학술저널
저자정보
Sung-Hoon Kim (Ye-dental Clinic) Kyung-Ho Ko (Gangneung-Wonju National University) Chan-Jin Park (Gangneung-Wonju National University) Lee-Ra Cho (Gangneung-Wonju National University) Yoon-Hyuk Huh (Gangneung-Wonju National University)
저널정보
대한치의학회 Journal of Korean Dental Science Journal of korean dental science Vol.18 No.1
발행연도
2025.3
수록면
1 - 11 (11page)

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Purpose: The opacity of zirconia sometimes requires a veneering material; thus lithium disilicate, a veneer material with ex- cellent strength, can be used. This study investigated the fracture resistance of zirconia–lithium disilicate (Zr-LS2) bi-layered crowns according to the design of the substructure. Materials and Methods: Five groups of posterior Zr-LS2 restorations (Zirtooth and Amber LiSi-POZ) were fabricated with different zirconia substructure coverage (control group, groups half occlusal zirconia coverage; 1/2OZ, and three-quarter occlusal zirconia coverage; 3/4OZ) and margin designs (control group, groups collar margin; C-M, and collarless margin; Cl-M). All restorations were cemented with self-adhesive resin cement followed by 24-h water storage and thermocycling (10,000 cycles, 5°C and 55°C). The fracture load was measured, and failure mode analysis, fractography, and elemental analysis were performed. The one-way analysis of variance and Fisher’s exact test were performed for statistical analyses (α=.05). Results: A significant difference was found in the fracture load of Zr-LS2 restorations according to the zirconia coverage of the occlusal area and margin design (P<.05). Group 3/4OZ was significantly larger than the control group C and 1/2OZ (P<.05). The C-M group had greater fracture loads based on margin design than the control group C and Cl-M (P<.05). Conclusion: The fracture resistance of posterior Zr-LS2 restorations increased with the zirconia coverage, occlusal thickness, and collar margin.

목차

Introduction
Materials and Methods
Results
Discussion
Conclusion
References

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