氟磷灰石玻璃陶瓷、长石质饰瓷与天然牙摩擦磨损性能的研究

目的：研究牙科氟磷灰石玻璃陶瓷、长石质饰瓷与天然牙在干摩擦和唾液润滑条件下的摩擦磨损学性能。方法：制备涂覆IPS-emaxcream和Vita vm9 2种饰面瓷的氧化锆-饰面瓷双层材料试样,尺寸为20 mm×20 mm×4.5 mm,各20个。利用MMV-1摩擦磨损试验机,通过设置不同大小的垂直载荷和转速,分别在干摩擦和唾液润滑条件下,对2种氧化锆-饰面瓷试样进行摩擦磨损试验。采用SPSS 17.0软件包进行单因素方差分析和t检验,确定各组间摩擦系数和磨损量是否存在差异。结果：氟磷灰石玻璃陶瓷在唾液润滑条件下的动态摩擦系数和磨损量显著大于干摩擦条件下的数值;与氟磷灰石玻璃陶瓷相反,长石质饰瓷在干摩擦时的动态摩擦系数和磨损量显著大于在唾液润滑条件下的数值。在干摩擦和唾液润滑条件下,氟磷灰石玻璃陶瓷的磨损量均小于长石质饰瓷。扫描电镜显示,在唾液润滑条件下,氟磷灰石玻璃陶瓷及对应天然牙表现出比干摩擦更为严重的磨损表面。在干摩擦条件下,长石质饰瓷及对应天然牙较氟磷灰石玻璃陶瓷磨损更为严重,在唾液润滑条件下差异较小。结论：与长石质饰瓷相比,氟磷灰石玻璃陶瓷与天然牙在干摩擦条件下表现出更优越的耐磨损性能。加入唾液后,能减少2种饰瓷摩擦磨损性能之间的差异。

Study on the friction and wear properties of fluorapatite glass ceramics,feldspathic porcelain and natural tooth

PURPOSE:The purpose of this study was to observe the friction and wear characteristics of dental fluorapatite glass ceramics,feldspathic porcelain and natural tooth in dry friction and saliva lubrication.METHODS:Two kinds of veneering porcelain(IPS-emaxcream and Vita vm9)coated zirconia-decorative porcelain double-layer material sample were prepared(size 20 mm×20 mm×4.5 mm),each group had 20 specimens.Friction and wear tests were carried out on2 kinds of zirconia-decorative porcelain sample under dry friction and saliva accompanying environment respectively by setting different sizes of vertical load and sliding frequency using MMV-1 friction and wear testing machine.SPSS 17.0 software package was used for one-way ANOVA and t test to determine whether there were differences in friction coefficient and wear amount between two groups.RESULTS:The dynamic friction coefficient and wear amount of fluorapatite glass ceramics under saliva lubrication condition were significantly greater than those under dry friction condition.On the contrary to fluorapatite glass ceramics,the dynamic friction coefficient and wear amount of feldspathic decorative ceramics under dry friction condition were significantly greater than those under saliva lubrication condition.Under dry friction and saliva lubrication,the wear amount of fluorapatite glass ceramics was significantly smaller than that of feldspathic decorative ceramics.Scanning electron microscopy showed that under saliva lubrication condition,fluorapatite glass ceramics and the corresponding natural teeth had more severe wear surface than dry friction.Under dry friction condition,feldspathic decorative porcelain and corresponding natural teeth wear more seriously than fluorapatite glass ceramic,and the difference in saliva lubrication condition was relatively small.CONCLUSIONS:Compared with feldspathic decorative porcelain,fluorapatite glass ceramics and natural teeth shows superior wear resistance under dry friction condition.The addition of saliva can reduce the difference between the friction and wear performance of the two decorative porcelains.