The Journal of Advanced Prosthodontics

The Korean Academy of Prosthodonitics (대한치과보철학회)
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Comparative analysis on intaglio surface trueness, wear volume loss of antagonist, and fracture resistance of full-contour monolithic zirconia crown for single-visit dentistry under simulated mastication

  • Kim, Yong-Kyu (Department of Prosthodontics, School of Dentistry and Dental Research Institute, Seoul National University) ;
  • Yoon, Hyung-In (Department of Prosthodontics, School of Dentistry and Dental Research Institute, Seoul National University) ;
  • Kim, Dae-Joon (Department of Dentistry, VASIC Research Center, School of Dentistry and Dental Research Institute, Seoul National University) ;
  • Han, Jung-Suk (Department of Prosthodontics, School of Dentistry and Dental Research Institute, Seoul National University)
  • Received : 2022.03.10
  • Accepted : 2022.06.13
  • Published : 2022.06.30
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Abstract

PURPOSE. This analysis aimed to evaluate the intaglio surface trueness, antagonist's wear volume loss, and fracture resistance of full-contour crowns of (Y, Nb)-stabilized fully-sintered zirconia (FSZ), 4 mol% or 5 mol% yttria-stabilized partially sintered zirconia (4YZ or 5YZ) with high-speed sintering. MATERIALS AND METHODS. A total of 42 zirconia crowns were separated into three groups: FSZ, 4YZ, and 5YZ (n = 14). The intaglio surface trueness of the crowns was evaluated at the inner surface, occlusal, margin, and axial areas and reported as root-mean-square, positive and negative average deviation. Half of the specimens were aged for 120,000 cycles in the chewing simulator, and the wear volume loss of antagonist was measured. Before and after chewing, the fracture load was measured for each group. The trueness values were analyzed with Welch's ANOVA, and the wear volume loss with the Kruskal-Wallis tests. Effect of the zirconia type and aging on fracture resistance of crowns was tested using two-way ANOVA. RESULTS. The intaglio surface trueness measured at four different areas of the crown was less than 50 ㎛, regardless of the type of zirconia. No significant P in wear volume loss of antagonists were detected among the groups (P > .05). Both the type of zirconia and aging showed statistically significant effects on fracture resistance (P < .05). CONCLUSION. The full-contour crowns of FSZ as well as 4YZ or 5YZ with high-speed sintering were clinically acceptable, in terms of intaglio surface trueness, antagonist's wear volume loss, and fracture resistance after simulated mastication.

Keywords

Acknowledgement

This work was supported by the Korea Medical Device Development Fund grant funded by the Korea Government (the Ministry of Science and ICT, the Ministry of Trade, Industry and Energy, the Ministry of Health & Welfare, the Ministry of Food and Drug Safety) (KMDF_PR_20200901_0002) and by Creative-Pioneering Researchers Program through Seoul National University (SNU). The biospecimens and data used for this study were provided by the Biobank of Seoul National University Dental Hospital, a member of the Korea Biobank Network (KBN4_A04).

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