Effects of veneering porcelain thickness and cooling rate on the residual stress in zirconia molar crowns
ZHANG Liang
FENG Lu
CHEN Zeng-li
XU Hong-quan
ZHAO Wen-feng
Abstract：AIM:To investigate the effects of veneering porcelain thickness and cooling rate on the residual stress in zirconia molar crowns.METHODS:6 veneered zirconia copings were divided into 3 groups based on veneer-ing porcelain thickness (1 mm,2 mm and 3 mm,n=2 )of flattened cusp heights .Half of the samples were fast cooled during final glazing,the other half were slowly cooled.Vickers indentation technique was used to determine sur-face residual stress.Data were statistically analysed.RESULTS:Compressive stress was recorded in fast cooling groups,while tensile stress was recorded in slow cooling groups.The highest residual compressive stress was recorded on the fast cooled 1mm cusps,which was significantly higher than that on the 2 and 3 mm crowns (P<0.05).There was a linear trend for residual stress to decrease with veneering porcelain thickness increase in the fast cooled group (P<0.05 ).No significant difference was found between the various cusp heights after slow cooling (P>0.05 ). CONCLUSION:Cooling rate,decorative porcelain thickness have important influence on residual stress.
Keywords：zirconiaporcelain crownsresidual stress:veneer thicknesscooling protocol
Publication Date：2014-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：4( 466-468,487 )