ABSTRACT

The fitness of self-glazed zirconia (SGZ) onlays fabricated with computer-aided design/computer-aided manufacturing was analysed, and conventional impressions (CIs) were compared with intraoral digital impressions (DIs). Onlay preparation was applied on a typodont left mandibular first molar to create 22 copy dies, which were divided into DI and CI groups. The marginal gap of DI-fabricated onlays was smaller than that of CI-fabricated onlays (p < 0.05). In both groups, the marginal gap was larger in the distal gingival than in other regions (p < 0.05), and a trend of decreasing marginal accuracy after thermal cycling was observed. SGZ onlays performed well for internal fitness; the overall internal gaps were 72.05 ± 8.16 and 100.96 ± 22.53 μm in Groups DI and CI, respectively. SGZ onlays exhibited clinically acceptable marginal and internal fitness values. The marginal adaptation of DI-fabricated onlays was better than that of CI-fabricated onlays.

摘要

分析了使用计算机辅助设计/计算机辅助制造制造的自釉氧化锆 (SGZ) 高嵌体的适用性，并将传统印模 (CI) 与口内数字印模 (DI) 进行了比较。将高嵌体制备应用于左下颌第一磨牙，制作 22 个复制模具，分为 DI 组和 CI 组。DI 制造的高嵌体的边缘间隙小于 CI 制造的高嵌体 ( p  < 0.05)。在两组中，远端牙龈的边缘间隙都比其他区域大（p < 0.05)，并且观察到热循环后边际精度下降的趋势。SGZ 嵌体在内部健身方面表现良好；DI 组和 CI 组的整体内部间隙分别为 72.05 ± 8.16 和 100.96 ± 22.53 μm。SGZ 嵌体表现出临床上可接受的边际和内部适合度值。DI 制造的高嵌体的边缘适应性优于 CI 制造的高嵌体。