Department of Prosthodontics, National and Kapodistrian University, Athens, Greece.
Int J Prosthodont. 2012 Mar-Apr;25(2):170-2.
This study evaluated the influence of two preparation types on the marginal fit of computer-aided design/computer-assisted manufacture (CAD/CAM) alumina copings. Two subgroups of four alumina copings each were fabricated using alumina master dies with either a chamfer or 90-degree shoulder preparation. Copings were scanned with an x-ray microtomographic scanner, and marginal fit was evaluated. The preparation types presented no statistically significant differences regarding marginal gap (P = .410) and absolute marginal discrepancy (P = .229). No correlation was found between marginal fit of CAD/CAM alumina copings and preparation type. Marginal fit could be considered within the limits of clinical acceptance.
本研究评估了两种预备类型对计算机辅助设计/计算机辅助制造（CAD/CAM）氧化铝全冠边缘适合性的影响。使用带有倒角或 90 度肩台预备的氧化铝母模制作了两组各四个氧化铝全冠。用 X 射线微断层扫描仪扫描全冠，并评估边缘适合性。预备类型在边缘间隙（P =.410）和绝对边缘差异（P =.229）方面无统计学差异。CAD/CAM 氧化铝全冠的边缘适合性与预备类型之间没有相关性。边缘适合性可以认为在临床可接受的范围内。
