Habib Syed Rashid, Bajunaid Salwa, Almansour Abdulrahman, AbuHaimed Abdulkarim, Almuqrin Muqrin Nasser, Alhadlaq Abdullah, Zafar Muhammad Sohail
Department of Prosthetic Dental Sciences, College of Dentistry, King Saud University, Riyadh 11545, Saudi Arabia.
Department of Restorative Dentistry, College of Dentistry, Taibah University, Al Madinah, Al Munawwarah 41311, Saudi Arabia.
Polymers (Basel). 2021 Mar 16;13(6):910. doi: 10.3390/polym13060910.
The aim of the present study was to investigate the shear bond strength of five different repair methods and adhesive systems for zirconia (Zr) cores layered with feldspathic porcelain. Seventy-five Zr specimens (10 × 10 × 4 mm) were prepared, sintered, layered with 2 × 10 × 10 mm of feldspathic porcelain, and fired. The ceramic was fractured, and the load recorded using a shear-bond test. Specimens were thermocycled and randomly divided into 5 groups (n = 15/group) based on the repair methods. Composite repair blocks with similar dimensions to the layered ceramic (2 × 10 × 10 mm) were built according to each repair method. Shear bond strength testing of the specimens with composite built up was carried out using a universal testing machine (Instron5960, Massachusetts, USA). The shear bond strengths of the adhesive interface between repaired composite and the Zr were recorded for all the test groups. The fractured specimens' surfaces were examined under a scanning electron microscope (Jeol, Musashino, Akishima, Tokyo, Japan) for evaluation of the type of failure and surface characteristics. Shear bond strength of the veneered ceramic bonded to the Zr for all the test groups was non-significant (ANOVA, = 0.062). Shear bond strength after the repair revealed significant differences (ANOVA, = 0.002). Group-C (13.79 ± 1.32) and Group-D (9.77 ± 4.77) showed the highest and lowest shear bond strength values, respectively. Paired Sample T-tests showed significantly lower values ( = 0.000) for the repaired (composite) Zr compared to the layered (ceramic) Zr. Multiple comparisons revealed differences (significant) between the shear bond strength of Group-D with Groups A ( = 0.010) and C ( = 0.003, Post Hoc Tukey test). The repair methods tested showed variations in their respective shear bond strengths. Complete ceramic/zirconia repair systems showed better bonding between the repaired composite and Zr core. The mean shear bond strength for the repaired fractured layered Zr showed acceptable outcomes in terms of clinical perspective, but was, however, unpredictable.
本研究的目的是调查五种不同修复方法和粘结系统对覆盖长石质瓷的氧化锆（Zr）核的剪切粘结强度。制备了75个Zr试样（10×10×4mm），进行烧结，覆盖2×10×10mm的长石质瓷，并进行烧制。使陶瓷断裂，并使用剪切粘结试验记录载荷。对试样进行热循环处理，并根据修复方法随机分为5组（每组n = 15）。根据每种修复方法制作尺寸与覆盖陶瓷相似（2×10×10mm）的复合修复块。使用万能试验机（Instron5960，美国马萨诸塞州）对复合修复后的试样进行剪切粘结强度测试。记录所有测试组修复后的复合材料与Zr之间粘结界面的剪切粘结强度。在扫描电子显微镜（日本东京秋留野市Musashino区Jeol公司）下检查断裂试样的表面，以评估失效类型和表面特征。所有测试组中，覆盖在Zr上的饰面陶瓷的剪切粘结强度无显著差异（方差分析，P = 0.062）。修复后的剪切粘结强度显示出显著差异（方差分析，P = 0.002）。C组（13.79±1.32）和D组（9.77±4.77）分别显示出最高和最低的剪切粘结强度值。配对样本T检验显示，修复后的（复合）Zr的数值显著低于覆盖的（陶瓷）Zr（P = 0.000）。多重比较显示，D组与A组（P = 0.010）和C组（P = 0.003，事后Tukey检验）的剪切粘结强度存在差异（显著）。所测试的修复方法在各自的剪切粘结强度方面存在差异。完整的陶瓷/氧化锆修复系统在修复后的复合材料与Zr核之间显示出更好的粘结。从临床角度来看，修复后的断裂覆盖Zr的平均剪切粘结强度显示出可接受的结果，但却是不可预测的。
