Int J Prosthodont. 2016 May-Jun;29(3):256-8. doi: 10.11607/ijp.4541.
The aim of this study was to investigate and compare the marginal fit of posterior fixed dental prostheses (FDPs) made of monolithic and veneered computer-aided design/computer-assisted manufacture (CAD/CAM) zirconia ceramic with metal-ceramic posterior FDPs.
Thirty standardized steel dies were prepared to receive posterior three-unit FDPs. Specimens were randomly divided into three groups (n = 10): (1) metal-ceramic (control group), (2) veneered zirconia, and (3) monolithic zirconia. All FDPs were cemented using a glass-ionomer cement. The specimens were subjected to thermal cycling (5°C to 55°C). A scanning electron microscope (SEM) with a magnification of ×500 was used for measurements. The data were statistically analyzed using one-way analysis of variance and paired t test.
Both zirconia groups showed similar vertical marginal discrepancies, and no significant differences (P = .661) in marginal adaptation were observed among the groups. No differences were observed in either group in marginal discrepancies between surfaces or abutments.
Monolithic zirconia posterior FDPs exhibit similar vertical marginal discrepancies to veneered zirconia posterior FDPs. No influence of localization measurements was observed.
本研究旨在调查和比较整体式和饰面计算机辅助设计/计算机辅助制造（CAD/CAM）氧化锆陶瓷与金属陶瓷后牙固定义齿（FDP）的边缘适合性。
制备 30 个标准化钢模以接收后三单位 FDP。样本随机分为三组（n=10）：（1）金属陶瓷（对照组）、（2）饰面氧化锆和（3）整体氧化锆。所有 FDP 均使用玻璃离子水门汀粘结。将样本进行热循环（5°C 至 55°C）。使用放大倍数为×500 的扫描电子显微镜（SEM）进行测量。使用单因素方差分析和配对 t 检验对数据进行统计学分析。
两组氧化锆均显示出相似的垂直边缘差异，且组间边缘适应性无显著差异（P=.661）。在任何一组中，表面或基牙之间的边缘差异均无差异。
整体氧化锆后牙 FDP 与饰面氧化锆后牙 FDP 具有相似的垂直边缘差异。未观察到定位测量的影响。
