Rhea Antonette, Ahila S C, Kumar B Muthu
Department of Prosthodontics, SRM Dental College, SRM University, Ramapuram, Chennai, Tamil Nadu, India.
Indian J Dent Res. 2017 Sep-Oct;28(5):498-502. doi: 10.4103/ijdr.IJDR_112_14.
Maxillofacial prosthesis are supported by implants, require a retentive matrix to retain the suprastructure. The retentive matrix is made up of acrylic resin to which the silicone prostheses are anchored by micro-mechanical bond. The delamination of silicone away from the retentive matrix is a persisting problem in implant-supported maxillofacial prosthesis.
This study aimed to evaluate the effect of laser etching on the shear bond strength (BS) between acrylic resin and maxillofacial silicone, after 24 h of fabrication and after 200 h of accelerated aging.
The samples were prepared according to ISO/TR 11405:1994 in maxillofacial silicone and polymethyl methacrylate resin. The untreated samples were Group A (control), Group B (silicon carbide [SiC] paper abrasion 80 grit size), and Group C (erbium-doped yttrium aluminum garnet laser etching). Then, the samples were coated with primer and bonded to maxillofacial silicone. The samples were subjected to shear BS test in an universal testing machine after 24 h of fabrication and after 200 h of accelerated aging.
The results were statistically analyzed using one-way ANOVA and Tukey's HSD post hoc test. The shear BS test after 24 h of fabrication showed better BS in SiC paper abrasion. The shear BS test after 200 h of accelerated aging showed better BS in laser etching compared to SiC abrasion.
Laser etching produced better shear BS compared to conventional SiC paper abrasion after 200 h of accelerated aging process.
颌面修复体由种植体支持，需要一个固位基质来固定上部结构。固位基质由丙烯酸树脂制成，硅橡胶假体通过微机械粘结固定在其上。硅橡胶与固位基质的分层是种植体支持的颌面修复体中一个长期存在的问题。
本研究旨在评估激光蚀刻对丙烯酸树脂与颌面硅橡胶之间剪切粘结强度（BS）的影响，分别在制作后24小时和加速老化200小时后进行评估。
根据ISO/TR 11405:1994制备颌面硅橡胶和聚甲基丙烯酸甲酯树脂的样本。未处理的样本分为A组（对照组）、B组（碳化硅[SiC]砂纸80目打磨）和C组（掺铒钇铝石榴石激光蚀刻）。然后，样本涂覆底漆并与颌面硅橡胶粘结。样本在制作后24小时和加速老化200小时后在万能试验机上进行剪切BS测试。
结果采用单因素方差分析和Tukey's HSD事后检验进行统计学分析。制作后24小时的剪切BS测试显示，SiC砂纸打磨的粘结强度更好。加速老化200小时后的剪切BS测试显示，与SiC打磨相比，激光蚀刻的粘结强度更好。
在加速老化200小时后，与传统的SiC砂纸打磨相比，激光蚀刻产生了更好的剪切粘结强度。
