Miura Shoko, Inagaki Ryoichi, Kasahara Shin, Yoda Masanobu
Department of Restorative Dentistry, Division of Fixed Prosthodontics, Tohoku University Graduate School of Dentistry.
Dent Mater J. 2014;33(4):484-9. doi: 10.4012/dmj.2013-284. Epub 2014 Jul 2.
The purpose of this study is to investigate the fit of zirconia cores and all-ceramic crowns prepared with different cervical margin designs. The radius of curvature between the axial wall and the occlusal surface was set to 1 mm in an abutment using the cervical shoulder marginal design (S) and to 0.2 and 0.5 mm in abutments with round shoulders (0.2RS and 0.5RS, respectively). The internal gaps of the cores were 45-138 μm (S), 41-141 μm (0.2RS), and 43-133 μm (0.5RS). The internal gaps of the all-ceramic crowns were 40-115 μm (S), 45-113 μm (0.2RS), and 42-126 μm (0.5RS). There were no significant differences in one-way ANOVA for any region in any marginal design before and after firing the porcelain. The marginal gaps between the all-ceramic crowns and dies were 27 ± 25 (S), 30 ± 29 (0.2RS), and 24 ± 27 μm (0.5RS), again with no significant differences in one-way ANOVA.
本研究的目的是调查采用不同颈部边缘设计制备的氧化锆核和全瓷冠的适配性。使用颈部肩台边缘设计（S）时，基牙轴向壁与咬合面之间的曲率半径设置为1mm；使用圆肩台设计时（分别为0.2RS和0.5RS），基牙的曲率半径设置为0.2mm和0.5mm。核的内部间隙为45-138μm（S）、41-141μm（0.2RS）和43-133μm（0.5RS）。全瓷冠的内部间隙为40-115μm（S）、45-113μm（0.2RS）和42-126μm（0.5RS）。在烧制瓷之前和之后，任何边缘设计的任何区域在单因素方差分析中均无显著差异。全瓷冠与代型之间的边缘间隙为27±25（S）、30±29（0.2RS）和24±27μm（0.5RS），同样在单因素方差分析中无显著差异。
