Amaral Regina, Ozcan Mutlu, Valandro Luiz Felipe, Balducci Ivan, Bottino Marco Antonio
Department of Dental Materials and Prosthodontics, São José dos Campos Dental School, São Paulo State University (UNESP), São José dos Campos, Brazil.
J Biomed Mater Res B Appl Biomater. 2008 Apr;85(1):1-9. doi: 10.1002/jbm.b.30908.
The objective of this study was to evaluate the durability of bond strength between a resin cement and aluminous ceramic submitted to various surface conditioning methods. Twenty-four blocks (5 x 5 x 4 mm(3)) of a glass-infiltrated zirconia-alumina ceramic (In-Ceram Zirconia Classic) were randomly divided into three surface treatment groups: ST1-Air-abrasion with 110-mum Al2O3 particles + silanization; ST2-Laboratory tribochemical silica coating method (110-microm Al2O3, 110-microm silica) (Rocatec) + silanization; ST3-Chairside tribochemical silica coating method (30-microm SiO(x)) (CoJet) + silanization. Each treated ceramic block was placed in its silicone mold with the treated surface exposed. The resin cement (Panavia F) was prepared and injected into the mold over the treated surface. Specimens were sectioned to achieve nontrimmed bar specimens (14 sp/block) that were randomly divided into two conditions: (a) Dry-microtensile test after sectioning; (b) Thermocycling (TC)-(6,000x, 5-55 degrees C) and water storage (150 days). Thus, six experimental groups were obtained (n = 50): Gr1-ST1 + dry; Gr2-ST1 + TC(;) Gr3-ST2 + dry; Gr4-ST2 + TC; Gr5-ST3 + dry; Gr6-ST3 + TC. After microtensile testing, the failure types were noted. ST2 (25.1 +/- 11) and ST3 (24.1 +/- 7.4) presented statistically higher bond strength (MPa) than that of ST1 (17.5 +/- 8) regardless of aging conditions (p < 0.0001). While Gr2 revealed the lowest results (13.3 +/- 6.4), the other groups (21.7 +/- 7.4-25. 9 +/- 9.1) showed statistically no significant differences (two-way ANOVA and Tukey's test, alpha = 0.05). The majority of the failures were mixed (82%) followed by adhesive failures (18%). Gr2 presented significantly higher incidence of ADHESIVE failures (54%) than those of other groups (p = 0.0001). Both laboratory and chairside silica coating plus silanization showed durable bond strength. After aging, air-abrasion with 110-microm Al(2)O(3) + silanization showed the largest decrease indicating that aging is fundamental for bond strength testing for acid-resistant zirconia ceramics in order to estimate their long-term performance in the mouth.
本研究的目的是评估采用各种表面处理方法后，树脂水门汀与铝质陶瓷之间粘结强度的耐久性。将24块（5×5×4 mm³）玻璃渗透氧化锆-氧化铝陶瓷（In-Ceram Zirconia Classic）随机分为三个表面处理组：ST1 - 用110μm Al₂O₃颗粒进行空气喷砂 + 硅烷化处理；ST2 - 实验室摩擦化学硅涂层法（110μm Al₂O₃，110μm二氧化硅）（Rocatec）+ 硅烷化处理；ST3 - 椅旁摩擦化学硅涂层法（30μm SiOₓ）（CoJet）+ 硅烷化处理。每个经处理的陶瓷块置于硅胶模具中，使处理过的表面暴露在外。制备树脂水门汀（Panavia F）并注入模具覆盖在处理过的表面上。将试样切割成未修整的条形试样（每块14个），随机分为两种情况：（a）切割后进行干态微拉伸试验；（b）热循环（TC）（6000次循环，5 - 55℃）和水储存（150天）。由此得到六个实验组（n = 50）：Gr1 - ST1 + 干态；Gr2 - ST1 + TC；Gr3 - ST2 + 干态；Gr4 - ST2 + TC；Gr5 - ST3 + 干态；Gr6 - ST3 + TC。微拉伸试验后，记录失效类型。无论老化条件如何，ST2（25.1±11）和ST3（24.1±7.4）的粘结强度（MPa）在统计学上均显著高于ST1（17.5±8）（p < 0.0001）。虽然Gr2的结果最低（13.3±6.4），但其他组（21.7±7.4 - 25.9±9.1）在统计学上无显著差异（双向方差分析和Tukey检验，α = 0.05）。大多数失效为混合失效（82%），其次是粘结失效（18%）。Gr2的粘结失效发生率（54%）显著高于其他组（p = 0.0001）。实验室和椅旁硅涂层加硅烷化处理均显示出持久的粘结强度。老化后，用110μm Al₂O₃进行空气喷砂 + 硅烷化处理的粘结强度下降最大，这表明老化对于耐酸氧化锆陶瓷粘结强度测试至关重要，以便评估其在口腔中的长期性能。
