Division of Restorative Sciences, School of Dentistry, University of Southern California, 3151 S. Hoover St., Los Angeles, CA 90089-7792, USA.
Clin Oral Implants Res. 2011 Feb;22(2):195-200. doi: 10.1111/j.1600-0501.2010.02012.x. Epub 2010 Oct 6.
This study assessed the fatigue resistance and failure mode of type III porcelain and composite resin veneers bonded to custom zirconia implant abutments.
Twenty-four standardized zirconia implant abutments were fabricated. Using the CEREC 3 machine, type III veneers of standardized shape were milled in ceramic Vita Mark II or in composite resin Paradigm MZ100. The intaglio surfaces of the restorations were hydrofluoric acid etched and silanated (Mark II) or airborne-particle abraded and silanated (MZ100). The fitting surface of the abutments was airborne-particle abraded, cleaned, and inserted into a bone level implant (BLI RC SLActive 10 mm). All veneers (n=24) were adhesively luted with a zirconia primer (Z-Prime Plus), adhesive resin (Optibond FL) and a pre-heated light-curing composite resin (Filtek Z100). Cyclic isometric chewing (5 Hz) was simulated, starting with a load of 40 N, followed by stages of 80, 120, 160, 200, 240, and 280 N (20,000 cycles each). Samples were loaded until fracture or to a maximum of 140,000 cycles. Groups were compared using the life table survival analysis (Logrank test at P=.05).
Mark II and MZ100 specimens fractured at an average load of 216 N and 229 N (survival rate of 17% and 8%), respectively, with no difference in survival probability (P=.18). Among the fractured samples, 40% of the failures were at the abutment level for Mark II and 27% were at the abutment level for MZ100. No exclusive adhesive failures were observed.
Type III Mark II and Paradigm MZ100 veneers showed similar fatigue resistance when bonded to custom non-retentive zirconia implant abutments. The bond was strong enough to induce abutment fractures. MZ100 presented a higher percentage of "friendly" failures, i.e. maintaining the restoration-abutment adhesive interface and the abutment itself intact.
本研究评估了粘结于定制氧化锆种植体基台的 III 型瓷和复合树脂贴面的耐疲劳性和失效模式。
制作 24 个标准化氧化锆种植体基台。使用 CEREC 3 机，在陶瓷 Vita Mark II 或复合树脂 Paradigm MZ100 上铣削标准化形状的 III 型贴面。修复体的凹面用氢氟酸蚀刻和硅烷化（Mark II）或喷丸处理和硅烷化（MZ100）。基台的贴合面用喷丸处理、清洁，然后插入骨水平种植体（BLI RC SLActive 10mm）。所有贴面（n=24）均用氧化锆底漆（Z-Prime Plus）、粘结树脂（Optibond FL）和预加热光固化复合树脂（Filtek Z100）进行粘结。从 40N 的初始负荷开始，模拟等距循环咀嚼（5Hz），然后进入 80、120、160、200、240 和 280N 的阶段（每个阶段 20000 次）。样品加载至断裂或最大 140000 次循环。使用寿命表生存分析（Logrank 检验，P=.05）比较组间差异。
Mark II 和 MZ100 标本的平均负荷分别为 216N 和 229N 时发生断裂（存活率分别为 17%和 8%），生存概率无差异（P=.18）。在断裂样本中，40%的失效发生在 Mark II 的基台水平，27%发生在 MZ100 的基台水平。未观察到纯粘结失败。
粘结于定制非固位氧化锆种植体基台的 III 型 Mark II 和 Paradigm MZ100 贴面具有相似的耐疲劳性。粘结强度足以导致基台断裂。MZ100 出现更高比例的“友好”失效，即保持修复体-基台粘结界面和基台本身完整。
