聚合后热压处理对不同表面处理的铸钛与聚合瓷结合强度的影响

目的 研究聚合后热压处理对不同表面处理的铸钛与聚合瓷结合强度的影响。方法 将30个金属试件随机分为5组：光滑组（A组）、喷砂组（B组）、酸蚀喷砂组（C组）、喷砂热压组（D组）、酸蚀喷砂热压组（E组），根据分组对试件进行相应处理并涂布聚合瓷，测试其剪切结合强度及表面显微硬度，并对钛与聚合瓷断裂面的形貌进行扫描电镜观察。结果 A、B、C、D、E组的剪切结合强度分别为（5.92±0.54）、（10.25±0.55）、（14.97±0.88）、（14.41±0.63）、（19.95±0.52） MPa，除C组与D组间无统计学差异外，其余两组之间均有统计学差异（P<0.01）。B、C、D和E组的钛表面可见部分聚合瓷残留于金属表面。D、E组的显微硬度值高于B、C组（P<0.05）。结论 聚合后热压处理可以显著提高钛与Ceramage聚合瓷的结合强度及聚合瓷的表面显微硬度。

Effects of post-cure heat treatment on the bond strength of Ceramage composite resins for titanium casting using dif-ferent surface treatments

Objective This study aims to investigate the effects of post-cure heat treatment (PCHT) on the bond strength of Ceramage composite resins for titanium casting using different surface treatments. Methods Metal specimens (n=30) were randomly divided into following five groups: polishing (group A), sandblasting (group B), acid etching after sandblasting (group C), PCHT after sandblasting (group D), and PCHT after sandblasting and acid etching (group E). The specimens were then processed and coated with Ceramage composite resins according to the grouping. After treatment, the shear bond strengths and microhardness of the specimens were evaluated. The fracture surface morphology of the titanium–Ceramage composite resin was observed using a scanning electron microscope. Results The shear bond strengths of groups A to E were (5.92±0.54), (10.25±0.55), (14.97±0.88), (14.41±0.63), and (19.95±0.52) MPa, respectively. No statistical difference was found between groups C and D, whereas the rest of the groups showed statistically significant differences (P<0.01). Visible polymerization residues were found on titanium porcelain metal surface of groups B to E. The microhardness values of groups D and E were higher than those of groups B and C (P<0.05). Conclusion PCHT significantly improves the bond strength and surface microhardness of Ceramage composite resins for titanium casting.