Matani Jay D, Kheur Mohit, Jambhekar Shantanu Subhashchandra, Bhargava Parag, Londhe Aditya
Department of Prosthodontics and Implantology, M A Rangoonwala College of Dental Sciences and Research Centre, Azam Campus, Pune, India.
J Prosthodont. 2014 Dec;23(8):626-33. doi: 10.1111/jopr.12176. Epub 2014 Jun 27.
To evaluate the shear bond strength (SBS) between zirconia and veneering ceramic following different surface treatments of zirconia. The efficacy of an experimental zirconia coating to improve the bond strength was also evaluated.
Zirconia strips were fabricated and were divided into four groups as per their surface treatment: polished (control), airborne-particle abrasion, laser irradiation, and application of the experimental coating. The surface roughness and the residual monoclinic content were evaluated before and after the respective surface treatments. A scanning electron microscope (SEM) analysis of the experimental surfaces was performed. All specimens were subjected to shear force in a universal testing machine. The SBS values were analyzed with one-way ANOVA followed by Bonferroni post hoc for groupwise comparisons. The fractured specimens were examined to observe the failure mode.
The SBS (29.17 MPa) and roughness values (0.80) of the experimental coating group were the highest among the groups. The residual monoclinic content was minimal (0.32) when compared to the remaining test groups. SEM analysis revealed a homogenous surface well adhered to an undamaged zirconia base. The other test groups showed destruction of the zirconia surface. The analysis of failure following bond strength testing showed entirely cohesive failures in the veneering ceramic in all study groups.
The experimental zirconia surface coating is a simple technique to increase the microroughness of the zirconia surface, and thereby improve the SBS to the veneering ceramic. It results in the least monoclinic content and produces no structural damage to the zirconia substructure.
评估氧化锆经过不同表面处理后与饰面陶瓷之间的剪切粘结强度（SBS）。还评估了一种实验性氧化锆涂层提高粘结强度的效果。
制作氧化锆条带，并根据其表面处理分为四组：抛光（对照组）、空气颗粒研磨、激光照射以及应用实验性涂层。在各自的表面处理前后评估表面粗糙度和残余单斜晶含量。对实验表面进行扫描电子显微镜（SEM）分析。所有标本在万能试验机中承受剪切力。SBS值采用单因素方差分析，随后进行Bonferroni事后检验以进行组间比较。检查断裂的标本以观察失效模式。
实验涂层组的SBS（29.17MPa）和粗糙度值（0.80）在各组中最高。与其余测试组相比，残余单斜晶含量最低（0.32）。SEM分析显示表面均匀，与未受损的氧化锆基体良好粘结。其他测试组显示氧化锆表面有破坏。粘结强度测试后的失效分析表明，所有研究组的饰面陶瓷均出现完全内聚破坏。
实验性氧化锆表面涂层是一种增加氧化锆表面微观粗糙度的简单技术，从而提高与饰面陶瓷的SBS。它导致的单斜晶含量最少，且不会对氧化锆亚结构造成结构损伤。
