Department of Prosthodontics, Faculty of Dentistry, Bezmialem University, Istanbul, Turkey.
Keçiborlu State Hospital, Keçiborlu, Isparta, Turkey.
J Adv Prosthodont. 2014 Dec;6(6):451-5. doi: 10.4047/jap.2014.6.6.451. Epub 2014 Dec 17.
The most common failure seen in restorations with a zirconia core is total or layered delamination of the ceramic veneer. In the present study, the shear bond strengths between veneering ceramics and colored zirconia oxide core materials were evaluated.
Zirconia discs (15 × 12 × 1.6 mm) were divided into 11 groups of 12 discs each. Groups were colored according to the Vita Classic scale: A3, B1, C4, D2, and D4. Each group was treated with the recommended shading time for 3 s, or with prolonged shading for 60 s, except for the control group. Samples were veneered with 3 mm thick and 3.5 mm in diameter translucent ceramic and subjected to shear test in a universal testing machine with a crosshead speed of 1 mm/min. One-way analysis of variance (ANOVA) and Tukey's HSD tests were used for comparisons of the groups having the same shading times. A paired t-test was used for groups of the same color (3 s/60 s).
Among the 11 groups investigated C4 (3 s) had the highest bond strength with a value of 36.40 MPa, while A3 (3 s) showed the lowest bond strength with a value of 29.47 MPa.
Coloring procedures can affect zirconia/ceramic bond strength. However, the results also showed that bond strengths of all the investigated groups were clinically acceptable.
修复体中最常见的失效模式是陶瓷贴面的整体或分层分层。本研究评估了饰面陶瓷与彩色氧化锆核材料之间的剪切结合强度。
将氧化锆圆盘（15×12×1.6mm）分为每组 12 个的 11 组。根据 Vita Classic 比色标准对组进行着色：A3、B1、C4、D2 和 D4。每组均用推荐的遮色时间处理 3s，或延长遮色时间至 60s，除对照组外。用 3mm 厚、直径 3.5mm 的半透明陶瓷对样本进行贴面处理，并在万能试验机上以 1mm/min 的十字头速度进行剪切试验。采用单向方差分析（ANOVA）和 Tukey 的 HSD 检验对具有相同遮色时间的组进行比较。对同一颜色的组（3s/60s）采用配对 t 检验。
在所研究的 11 组中，C4（3s）的结合强度最高，为 36.40MPa，而 A3（3s）的结合强度最低，为 29.47MPa。
着色程序会影响氧化锆/陶瓷的结合强度。然而，结果还表明，所有研究组的结合强度均在临床可接受范围内。
