Strain analysis of anterior resin-bonded fixed dental prostheses with different thicknesses of high translucent zirconia

• Published in: Journal of dental sciences 2021-03, Vol.16 (2), p.628-635
• Main Authors: Noda, Michiko, Omori, Satoshi, Nemoto, Reina, Sukumoda, Erika, Takita, Mina, Foxton, Richard, Nozaki, Kosuke, Miura, Hiroyuki
• Format: Article
• Language: English
• Subjects: Anterior restoration; High translucent zirconia; Original; Resin-bonded fixed dental prostheses; Retainer thickness; Strain analysis
• ISSN: 1991-7902; 2213-8862
• DOI: 10.1016/j.jds.2020.10.002

High translucent zirconia has been used as a new monolithic zirconia prosthesis, which has the potential to make anterior resin-bonded fixed dental prostheses (RBFDPs) without veneering porcelain. However, it is unclear whether the RBFDPs retainer can be thinned as much as conventional zirconia RBFDPs. The aim of this study was to assess the usability of high translucent zirconia RBFDPs with a thin retainer thickness by evaluating differences in retainer thickness on the surface strain. A model with a missing upper lateral incisor was used. The abutment teeth were upper central incisor and canine. Three types of RBFDPs were fabricated as follows: metal RBFDPs with a retainer thickness of 0.8 mm (0.8M), and high translucent zirconia RBFDPs with a retainer thicknesses of 0.8 and 0.5 mm (0.8Z, 0.5Z) (n = 10). The fitness of the margins was evaluated by the silicone replica technique. The surface strain of each retainer under static loading was measured and statistically analyzed using a t-test with Bonferroni correction. The marginal fitness of all RBFDPs was under 76.1 μm, which was clinically acceptable. Each strain of the 0.8Z and 0.5Z groups was significantly lower than that of the 0.8M (p