Can low-fusing glass application affect the marginal misfit and bond strength of Y-TZP crowns?
Can low-fusing glass application affect the marginal misfit and bond strength of Y-TZP crowns?
复制标题
低熔玻璃的应用会影响 Y-TZP 牙冠的边缘错配和粘结强度吗？
作者：
Monize Carelli Felipe Antunes;J. S. Miranda;R. D. Carvalho;R. F. Carvalho;E. Kimpara;R. O. D. Assunção e Souza;F. Leite
目的：评价不同表面处理对Y-TZP全冠与环氧树脂的边缘错配和固位强度的影响。将40个环氧树脂(G10)基牙(高度：5 mm，锥度：60，终止线：大倒角)等尺寸球磨后置于聚亚安酯中，模拟牙周韧带。然后，将40个厚度为1 mm的Y-TZP全冠(Cerec In Lab)球磨后，按表面处理方法随机分为四组(n=10)：GS组、GP组、P组和RS组。处理后的表面用双自粘结剂粘结，光固化，并接受热机械循环(2×106,100N，4 Hz，5°/55°C)。采用体视显微镜和扫描电子显微镜对边缘错配进行分析。进行固位强度测试(1 mm/min)，直到牙冠脱粘。对GS组和GP组进行釉层厚度测量。采用Kruskal Wallis和Dunn检验对数据进行边际失配分析；对抗拉强度数据进行单因素方差分析和Tukey(5%)分析。GS(48.6±19.9μm)和GP(65.4±42.5μm)的边缘错配显著低于RS(96±62.9μm)和P(156±113.3μm)(p=0.001)。GP组(470.5±104.1N)和GS组(416.8±170.2N)固位强度与P组(342.1±109.7N)相近，但显著高于RS组(208.9±110N)。GS釉层为11.64μm，GP釉层为9.73μm。因此，施釉可降低边际差异，提高固位强度。
To evaluate the effect of different surface treatments on the marginal misfit and retentive strength between Y-TZP crowns and an epoxy resin. Forty (40) epoxy resin (G10) abutments (height: 5mm, conicity: 60, finish line: large chamfer) with equal dimensions were milled and included in polyurethane to simulate the periodontal ligament. Next, 40 Y-TZP crowns (thickness: 1mm) were milled (Cerec in Lab) and randomly divided into four groups (n=10) according to the surface treatment: GS(glaze spray), GP(glaze powder/liquid), P(zirconia primer) and RS(tribochemical silica coating). The conditioned surfaces were cemented with dual self-adhesive cement, light cured and submitted to thermomechanical cycling (2x106, 100N, 4Hz, 5°/55°C). Marginal misfit was analyzed by a stereomicroscope and SEM. Retentive strength test was performed (1mm/min) until crown debonding. Glaze layer thickness was also performed to GS and GP groups. Marginal misfit data were analyzed by Kruskal Wallis and Dunn tests; one-way ANOVA and Tukey (5%) analyzed the tensile strength data. The marginal misfit of the GS (48.6±19.9μm) and GP (65.4±42.5μm) were statistically lower than the RS (96±62.9μm) and P (156±113.3μm) (p=0.001). The retentive strength of the GP (470.5±104.1N) and GS (416.8±170.2N) were similar to the P (342.1±109.7N), but statistically higher than those of the RS (208.9±110N). The GS and GP glaze layer was 11.64μm and 9.73μm respectively. Thus, glaze application promoted lower marginal discrepancy and higher retentive strength values than conventional techniques.