West China Journal of Stomatology ›› 2017, Vol. 35 ›› Issue (4): 389-394.doi: 10.7518/hxkq.2017.04.009

• Orginal Article • Previous Articles     Next Articles

Effect of repeated sintering and variations in thickness on the color and microstructure of dental lithium disilicate-based glass ceramic veneers

Cui Huang1(), Jia Yu2, Shaofeng Meng2, Biyun Gao3   

  1. 1. Dept. of Prosthodontics, Stomatology Hospital of Guangxi Medical University, Nanning 530021, China
    2. Dept. of Dental Laboratory Center, Stomatology Hospital of Guangxi Medical University, Nanning 530021, China
    3. Dept. of Pediatric Dentistry, Stomatology Hospital of Guangxi Medical University, Nanning 530021, China
  • Received:2016-11-20 Revised:2017-05-10 Online:2017-08-01 Published:2017-08-01
  • Supported by:
    Youth Foundation of Guangxi Medical University (GXMUYSH201523)

Abstract:

Objective The aim of this study is to evaluate the effect of repeated sintering and variation in thickness on the color and microstructure of dental lithium disilicate-based glass ceramic veneers. Methods A total of 24 computer aided design and computer aided manufacturing (CAD/CAM) veneers was fabricated using the IPS e.max-CAD LS2 and then randomly divided into four groups (S0, S1, S2, S3; n=6). Each group was sintered 0, 1, 2, 3 times individually according to the manufacturer’s recommendation. The color parameters (L, C, H, a, b values) of all the specimens were measured by a Vita easyshade dental colorimeter. The results were statistically analyzed using the SAS 9.1.3 software for MANOVA and LSD. Subsequently, the microstructures of the intersecting surfaces of the specimens were observed by scanning electron microscopy (SEM). Results After repeated sintering, the L value significantly decreased (P<0.05). For the C and b values, statistical differences were observed among the groups except between S2 and S3. SEM results showed that the interlocking microstructures of rod-shaped Li2Si2O5 crystals became more compact when the number of sintering times was increased. Conclusion Repeated sintering exhibited significant influence on the color of the IPS e.max-CAD LS2 veneers.

Key words: veneer, repeated sintering, computer aided design and computer aided manufacturing, lithium disilicate-based glass ceramic, color, scanning electron microscope

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