Department of Fixed Prosthodontics, Tsurumi University, School of Dental Medicine, 2-1-3 Tsurumi Tsurumi-ku, Yokohama City, Japan.
J Prosthodont Res. 2011 Jan;55(1):40-3. doi: 10.1016/j.jpor.2010.09.001. Epub 2010 Oct 8.
Marginal and internal gaps of NobelProcera crown zirconia were clinically evaluated using silicone materials.
Ninety-one crowns were examined before final cementation, and white and black silicone materials were used to record the marginal and internal fit. The silicone materials were sectioned bucco-lingually and mesio-distally, and the thickness of the silicone layers was measured using a microscope. Sixteen reference points were measured on each specimen, and mean marginal and internal gaps were obtained. Mean marginal gaps among anterior, premolar, and molar tooth groups, in addition to mean gaps at the reference points within the groups, were compared using two-way ANOVA and Games-Howell analysis.
The marginal mean values were the smallest among all tooth groups, and the largest were at the rounded shoulders. There were no significant differences in the mean marginal gaps among the three tooth groups, while there were significant differences in the mean marginal and internal gaps of each tooth group.
The mean marginal gap of the NobelProcera crown zirconia was 44.2 μm, which is within clinically accepted standards.
使用硅橡胶材料临床评价诺贝尔生物全瓷冠氧化锆的边缘和内部间隙。
91 个冠在最终粘固前进行检查，使用白色和黑色硅橡胶记录边缘和内部适合性。硅橡胶材料颊舌向和近远中向切开，使用显微镜测量硅橡胶层的厚度。每个样本测量 16 个参考点，获得平均边缘和内部间隙。使用双向方差分析和 Games-Howell 分析比较前牙、前磨牙和磨牙组的平均边缘间隙，以及组内各参考点的平均间隙。
所有牙组中，边缘平均间隙最小，圆肩处最大。三组牙之间的平均边缘间隙无显著差异，而每个牙组的平均边缘和内部间隙有显著差异。
诺贝尔生物全瓷冠氧化锆的平均边缘间隙为 44.2μm，在临床可接受的标准范围内。
