The Journal of Advanced Prosthodontics

The Korean Academy of Prosthodonitics (대한치과보철학회)
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Microhardness of resin cements after light activation through various translucencies of monolithic zirconia

  • Pechteewang, Sawanya (Department of Prosthodontics, Faculty of Dentistry, Chulalongkorn University) ;
  • Salimee, Prarom (Department of Prosthodontics, Faculty of Dentistry, Chulalongkorn University)
  • Received : 2021.05.12
  • Accepted : 2021.08.20
  • Published : 2021.08.31
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Abstract

PURPOSE. This study aimed to investigate the Vickers Hardness Number (VHN) of light- and dual cured resin cements cured through monolithic zirconia specimens (VITA YZ) of various translucencies: translucent (T); high translucent (HT); super translucent (ST); and extra translucent (XT) at 0, 24, and 48 h after curing. MATERIALS AND METHODS. Four zirconia specimens from each translucency were prepared. Two light-cured resin cements (Variolink N LC; VL and RelyX Veneer; RL) and two dual-cured resin cements (Variolink N DC; VD and RelyX U200; RD) were used. The cement was mixed and loaded in a mold and cured for 20 s through the zirconia specimen. The upper surface of cements was tested for VHN using a microhardness tester at 0, 24, and 48 h after curing. The VHN were analyzed using two-way repeated, Brown-Forsythe ANOVA with Games Howell post-hoc analysis and independent t-tests (P < .05). RESULTS. All cements showed significantly higher VHN from 0 h to 24 h (P < .001). At 48 h, the VHN of light-cured cements were significantly lower when cured under the T groups than under XT groups (P = .001 in VL, P = .014 in RL). At each post curing time of each translucency, VD showed higher VHN than VL (P < .05), and RD also showed higher VHN than RL (P < .05). CONCLUSION. The translucency of zirconia has an effect on the VHN for light-cured resin cements, but has no effect on dual-cured resin cements. Dual-cured resin cement exhibited higher VHN than the light-cured resin cement from the same manufacturer. All resin cements showed significantly higher VHN from 0 h to 24 h.

Keywords

Acknowledgement

The authors are grateful to Prof. Martin Tyas, Melbourne Dental School, for the manuscript revision, Asst. Prof. Soranun Chantarangsu and Dr. Nareudee Limpuangthip, Chulalongkorn University, for their assistance in statistical analysis.

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