Noda Michiko, Omori Satoshi, Nemoto Reina, Sukumoda Erika, Takita Mina, Foxton Richard, Nozaki Kosuke, Miura Hiroyuki
Department of Fixed Prosthodontics, Division of Oral Health Sciences, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University (TMDU), Tokyo, Japan.
Restorative Dentistry, Faculty of Dentistry, Oral & Craniofacial Sciences, King's College London, London, UK.
J Dent Sci. 2021 Mar;16(2):628-635. doi: 10.1016/j.jds.2020.10.002. Epub 2020 Oct 23.
BACKGROUND/PURPOSE: 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 ( < 0.05). There was no difference in strain of the zirconia RBFDPs even if the retainer thickness was changed.
Our results suggest that the high translucent zirconia RBFDPs can be manufactured with a retainer thickness of 0.5 mm, which reduces the amount of tooth preparation compared to the metal RBFDPs.
背景/目的：高透明度氧化锆已被用作一种新型的整体式氧化锆修复体，它有可能制作无需 veneering 瓷的前牙树脂粘结固定义齿（RBFDPs）。然而，尚不清楚 RBFDPs 的固位体是否能像传统氧化锆 RBFDPs 那样减薄。本研究的目的是通过评估固位体厚度对表面应变的差异，来评估具有薄固位体厚度的高透明度氧化锆 RBFDPs 的可用性。
使用一个上颌侧切牙缺失的模型。基牙为上颌中切牙和尖牙。制作三种类型的 RBFDPs 如下：固位体厚度为 0.8 毫米的金属 RBFDPs（0.8M），以及固位体厚度为 0.8 毫米和 0.5 毫米的高透明度氧化锆 RBFDPs（0.8Z，0.5Z）（n = 10）。通过硅橡胶复制技术评估边缘适合性。在静态加载下测量每个固位体的表面应变，并使用带有 Bonferroni 校正的 t 检验进行统计分析。
所有 RBFDPs 的边缘适合性均在 76.1 微米以下，临床上可接受。0.8Z 和 0.5Z 组的每种应变均显著低于 0.8M 组（<0.05）。即使固位体厚度改变，氧化锆 RBFDPs 的应变也没有差异。
我们的结果表明，高透明度氧化锆 RBFDPs 可以制作固位体厚度为 0.5 毫米，与金属 RBFDPs 相比，这减少了牙体预备量。
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