Effects of simulated clinical grinding and subsequent heat treatment on microcrack healing of a lithium disilicate ceramic.
Grinding intaglio surfaces of ceramic restorations with diamond burs is a common procedure to improve fit. This study evaluated the effects of simulated diamond bur grinding and subsequent veneer firing and glazing on a lithium disilicate glass-ceramic. The results revealed a significant reduction in the roughness and strength of the material after diamond bur grinding, whereas the strength was restored through crack healing and formation of a glass layer after heat treatment. The finding indicates that grinding of lithium disilicate ceramics with diamond burs may introduce flaws and cracks, and therefore subsequent heat treatments, veneer firing, or glazing, are suggested.
Hung
Cheng-Yuan
CY
School of Dentistry, National Yang-Ming University, Taipei, Taiwan.
Lai
Yu-Lin
YL
Hsieh
Yun-Lin
YL
Chi
Lin-Yang
LY
Lee
Shyh-Yuan
SY
D003198:Computer Simulation; D003775:Dental Polishing; D003776:Dental Porcelain; D017269:Dental Prosthesis Repair; D003799:Dental Stress Analysis; D003801:Dental Veneers; D006358:Hot Temperature; D018020:Lithium Compounds; D008422:Materials Testing; D018583:Pliability; D017755:Prosthesis Fitting; D011897:Random Allocation
C118557:Empress 2; D018020:Lithium Compounds; D003776:Dental Porcelain