Yeğin Elif, Atala Mustafa Hayati
Department of Prosthodontics, Faculty of Dentistry, Biruni University, Istanbul, Turkey.
Department of Prosthodontics, Faculty of Dentistry, Medeniyet University, Istanbul, Turkey.
Int J Implant Dent. 2020 Oct 27;6(1):69. doi: 10.1186/s40729-020-00267-x.
Present study compared the failure load of CAD/CAM-manufactured implant-supported crowns and the stress distribution on the prosthesis-implant-bone complex with different restoration techniques.
The materials were divided into four groups: group L-M: lithium disilicate ceramic (LDS, monolithic), group L-V: LDS ceramic (veneering), group ZL-M: zirconia-reinforced lithium silicate ceramic (ZLS, monolithic), group ZL-V: ZLS ceramic (veneering). Crown restorations were subjected to load-to-failure test (0.5 mm/min). Failure loads of each group were statistically analyzed (two-way ANOVA, post hoc Tukey HSD, α = 0.05). Finite element analysis (FEA) was used to compare the stress distribution of crown restorations.
Group L-M had the highest failure load (2891.88 ± 410.12 N) with a significant difference from other groups (p < 0.05). Although there was a significant difference between group ZL-M (1750.28 ± 314.96 N) and ZL-V (2202.55 ± 503.14 N), there was no significant difference from group L-V in both groups (2077.37 ± 356.59 N) (p > 0.05).
The veneer application had opposite effects on ceramics, increased the failure load of ZLS and reduced it for LDS without a statistically significant difference. Both materials are suitable for implant-supported crowns. Different restorative materials did not influence the stress distribution, but monolithic restorations reduced the stress concentration on the implant and bone.
本研究比较了采用不同修复技术的计算机辅助设计/计算机辅助制造（CAD/CAM）制作的种植体支持冠的破坏载荷以及假体-种植体-骨复合体上的应力分布。
材料分为四组：L-M组：二硅酸锂陶瓷（LDS，整体式），L-V组：LDS陶瓷（贴面式），ZL-M组：氧化锆增强二硅酸锂陶瓷（ZLS，整体式），ZL-V组：ZLS陶瓷（贴面式）。对冠修复体进行破坏载荷试验（0.5毫米/分钟）。对每组的破坏载荷进行统计学分析（双向方差分析，事后Tukey HSD检验，α = 0.05）。采用有限元分析（FEA）比较冠修复体的应力分布。
L-M组的破坏载荷最高（2891.88 ± 410.12牛顿），与其他组有显著差异（p < 0.05）。虽然ZL-M组（1750.28 ± 314.96牛顿）和ZL-V组（2202.55 ± 503.14牛顿）之间存在显著差异，但两组与L-V组（2077.37 ± 356.59牛顿）均无显著差异（p > 0.05）。
贴面应用对陶瓷有相反的影响，增加了ZLS的破坏载荷，降低了LDS的破坏载荷，但无统计学显著差异。两种材料均适用于种植体支持冠。不同的修复材料不影响应力分布，但整体式修复降低了种植体和骨上的应力集中。
