Barbon Fabíola Jardim, Moraes Rafael Ratto, Boscato Noéli, Alessandretti Rodrigo, Spazzin Aloísio Oro
Department of Restorative Dentistry, School of Dentistry, IMED - Meridional Faculty, Passo Fundo, RS, Brazil.
Department of Restorative Dentistry, School of Dentistry, UFPel - Universidade Federal de Pelotas, Pelotas, RS, Brazil.
Braz Dent J. 2018 Mar-Apr;29(2):202-207. doi: 10.1590/0103-6440201801896.
This study evaluated the effect of the accelerated artificial aging (AAA) on feldspar ceramic strength and the reinforcing effect promoted by adhesive cementation with resin luting agent. One hundred twenty feldspar ceramic disks were obtained. Sixty disks were acid-etched, silanized, and coated with an experimental resin luting agent simulating the adhesive luting procedures. Four groups were created (n=30): uncoated ceramic (control group), uncoated ceramic submitted to AAA, ceramic coated with resin luting agent, and coated ceramic submitted to AAA. Biaxial flexural testing with ball-on-ring setup was carried out. Biaxial flexural strength (s bf , MPa), characteristic strength (s 0 , MPa), and Weibull modulus (m) were calculated for axial positions z=0 (ceramic surface) and z=-t2 (luting agent surface). Data of s bf at positions z=0 and z=-t2 were separately submitted to statistical analyses (a=0.05). The uncoated ceramic submitted to AAA had no significant difference in s bf and s 0 compared with the control group. Resin coating of the ceramic increased s bf and s 0 at z=0. The AAA increased the s bf and s 0 for the resin-coated ceramic specimens at z=0 and also the s 0 at axial position z=-t2. The structural reliability at z=0 and z=-t2 was not influenced by the variables tested. In conclusion, resin coating improved the mechanical strength of the feldspar ceramic. The AAA procedure was not effective in aging the uncoated or resin-coated feldspar ceramic specimens.
本研究评估了加速人工老化（AAA）对长石陶瓷强度的影响以及树脂粘结剂粘结促进的增强效果。制备了120个长石陶瓷盘。60个盘进行酸蚀、硅烷化处理，并涂覆一种模拟粘结粘结程序的实验性树脂粘结剂。创建了四组（n = 30）：未涂覆陶瓷（对照组）、进行AAA处理的未涂覆陶瓷、涂覆树脂粘结剂的陶瓷以及进行AAA处理的涂覆陶瓷。采用球-环装置进行双轴弯曲试验。计算轴向位置z = 0（陶瓷表面）和z = -t2（粘结剂表面）的双轴弯曲强度（s bf，MPa）、特征强度（s 0，MPa）和威布尔模量（m）。z = 0和z = -t2位置的s bf数据分别进行统计分析（α = 0.05）。与对照组相比，进行AAA处理的未涂覆陶瓷在s bf和s 0方面无显著差异。陶瓷的树脂涂层在z = 0处提高了s bf和s 0。AAA提高了z = 0处树脂涂覆陶瓷试件的s bf和s 0，以及轴向位置z = -t2处的s 0。z = 0和z = -t2处的结构可靠性不受测试变量的影响。总之，树脂涂层提高了长石陶瓷的机械强度。AAA程序对未涂覆或树脂涂覆的长石陶瓷试件老化无效。
