冷热循环老化对树脂-陶瓷复合体力学性能的影响

Effects of thermal cycling on mechanical properties of resin-ceramic composites

目的观察冷热循环老化对树脂－陶瓷复合体力学性能的影响。方法以树脂－陶瓷复合体A（Lava Ultimate，美国3M公司），B（block HC，日本松风公司），C（Hyramic润瓷，中国爱尔创公司），D（Vita Enamic，德国Vita公司）为实验组，长石质玻璃陶瓷E（MarkⅡ，德国Vita公司）为对照组，每组30个样本，分别在老化前和经10 000及20 000次冷热循环后测量弯曲强度、弹性模量和维氏硬度值，并进行统计学分析。结果在冷热循环老化前，A、B、C组的弯曲强度[（166.28±13.78）MPa、（170.21±11.36）MPa和（202.04±16.55）MPa]高于D和E组[（137.09±8.83）MPa和（119.35±5.98）MPa]，E组的弹性模量[（62.39±3.40）GPa]和维氏硬度[（406.97±14.73）HV]高于其他各组，差异均有统计学意义（均P〈0.05）。经冷热循环老化后，A、B、C三组材料弯曲强度、弹性模量和维氏硬度均有明显下降（均P〈0.05），而D和E组差异均无统计学意义（均P〉0.05）。结论经冷热循环老化后，A、B、C三种材料力学性能出现下降，而D和E组材料力学性能较为稳定。

ObjectiveTo investigate the influence of thermal cycling on the mechanical properties of resin-ceramic composites.MethodsThe different groups of resin-ceramic composites A （Lava Ultimate, 3M ESPE, USA）, B （block HC, Shofu, Japan）, C （Hyramic, Upcera, China）, D （Vita Enamic, Vita, German）, and the feldspar ceramic E （Mark Ⅱ, Vita, German） were included in this study. The properties of these groups （with 30 samples in each group）, including flexural strength, flexural modulus and Vickers hardness were tested before and after thermal cycling （0, 10 000 and 20 000 cycles, respectively）. The data were statistically analyzed. ResultsBefore thermal cycling, the flexural strength of groups A, B and C [（166.28±13.78） MPa, （170.21±11.36） MPa and （202.04±16.55） MPa] were higher than those of groups D and E [（137.09±8.83） MPa and （119.35±5.98） MPa], and the flexural modulus [（62.39±3.40） GPa] and Vickers hardness [（406.97±14.73） HV] of E group were higher than those of other groups （P〈0.05）. The flexural strength, flexural modulus and Vickers hardness of groups D and E did not change after thermal cycling （all P〉0.05）, while those of groups A, B and C decreased （all P〈0.05）.ConclusionAfter thermal cycling, the mechanical properties of the A, B and C groups decreased, while those of the groups D and E were stable.