An experimental study of the wear behavior of dental feldspathic glass-ceramic and lithium disilicate glass-ceramic
10.3760/cma.j.issn.1002-0098.2013.11.010
- VernacularTitle:牙科长石质玻璃陶瓷与二硅酸锂玻璃陶瓷磨损性能的实验研究
- Author:
Bei-Min TIAN
1
;
Shao-Feng ZHANG
;
HE-Lin
;
Jia-Wen GUO
;
Jin-Tao YU
;
Xiao-Hong WU
Author Information
1. 第四军医大学口腔医学院修复科
- Keywords:
Dental porcelain;
Dental restoration wear;
Microscopy,electron,scanning
- From:
Chinese Journal of Stomatology
2013;48(11):683-688
- CountryChina
- Language:Chinese
-
Abstract:
Objective To investigate the tribology characteristics of two ceramic materials in vitro:feldspathic glass-ceramic (veneer porcelain) and lithium disilicate glass-ceramic (heat-pressed ceramic),and to evaluate the wear resistance of different ceramic materials from the dynamic chewing perspective.Methods Wear tests were performed in simulated oral environment with stainless steel ball antagonists(r =3 mm),veneer porcelain (CERAMCO 3) and heat-pressed ceramic (IPS e.max Press HT type) in the chewing simulator.The tribological tests were carried out under artificial saliva lubrication condition in room temperature with a vertical load of 10 N for 1.2 × 106 cycles(f=1.5 Hz,uniform circular motion,revolving speed =90 r/min,radius =0.5 mm).The wear volumes were measured using threedimensional profiling,and surface microscopic morphology were observed using scanning electron microscopy at time point of 200 000,400 000,600 000,800 000,1 000 000,and 1 200 000 cycles.Results In a simulated oral environment,the wear rates of veneer porcelain were (0.001 20 ±0.00 018),(0.000 10 ±0.000 03),(0.000 50 ± 0.000 05),(0.000 10 ±0.000 02),(0.004 10 ±0.000 38),and (0.019 00 ±0.003 53) (× 10-4 mm3/cycles) at 200 000,400 000,600 000,800 000,1 000 000,1 200 000cycles.The wear rates of heat-pressed ceramic were (0.139 50 ± 0.030 94),(0.124 40 ± 0.031 20),(0.054 80 ± 0.005 38),(0.038 80 ± 0.006 10),(0.011 10 ± 0.003 75),(0.198 90 ± 0.045 80) (× 10-4mm3/cycles) at 200 000,400 000,600 000,800 000,1 000 000,1 200 000 cycles.Three stages were observed in the wear loss process of the two materials:running-in stage,steady wear stage and severe wear stage.In running-in and steady wear stage,the shallow wear tracks of veneer porcelain were produced by the fatigue effect.While in severe wear stage,the wear tracks turned into ploughing.In running-in stage,the surface of heat-pressed ceramic was characterized by dense and shallow ploughing.In steady wear stage,the wear tracks turned into flake peeling produced by fatigue effect.At last,the whole layer was worn off by the effects of ploughing.Conclusions In a simulated oral environment,the wear rate and wear loss of heatpressed ceramic are greater than that of veneer porcelain.
