Antunes Monize Carelli Felipe, Miranda Jean Soares, Carvalho Ronaldo Luís Almeida de, Carvalho Rodrigo Furtado de, Kimpara Estevão Tomomitsu, Assunção E Souza Rodrigo Othávio de, Leite Fabíola Pessôa Pereira
Department of Restorative Dentistry, Universidade Federal de Juiz de Fora - UFJF, Juiz de Fora, MG, Brazil.
São José dos Campos Dental School, Institute of Science and Technology, Universidade Estadual Paulista - Unesp, São José dos Campos, SP, Brazil.
Braz Oral Res. 2018;32:e34. doi: 10.1590/1807-3107bor-2018.vol32.0034. Epub 2018 May 7.
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.
为评估不同表面处理对Y-TZP全冠与环氧树脂之间边缘适合性和固位强度的影响。将40个尺寸相同的环氧树脂（G10）基台（高度：5mm，锥度：60，肩台：大斜面）进行铣削，并置于聚氨酯中以模拟牙周韧带。接下来，铣削40个Y-TZP全冠（厚度：1mm）（使用Cerec in Lab），并根据表面处理随机分为四组（n = 10）：GS（釉面喷涂）、GP（釉粉/液）、P（氧化锆底漆）和RS（摩擦化学硅涂层）。对处理过的表面用双组分自粘型粘结剂粘结，光固化并进行热机械循环（2×10⁶次，100N，4Hz，5°/55°C）。通过体视显微镜和扫描电子显微镜分析边缘适合性。进行固位强度测试（1mm/min）直至全冠脱粘。还对GS组和GP组进行了釉层厚度测量。边缘适合性数据采用Kruskal Wallis和Dunn检验进行分析；单向方差分析和Tukey检验（5%）分析拉伸强度数据。GS组（48.6±19.9μm）和GP组（65.4±42.5μm）的边缘适合性在统计学上低于RS组（96±62.9μm）和P组（156±113.3μm）（p = 0.001）。GP组（470.5±104.1N）和GS组（416.8±170.2N）的固位强度与P组（342.1±109.7N）相似，但在统计学上高于RS组（208.9±110N）。GS组和GP组的釉层厚度分别为11.64μm和9.73μm。因此，与传统技术相比，应用釉面可降低边缘差异并提高固位强度值。
