Oral and Maxillofacial Prosthodontics Department, Faculty of Dentistry, Ain Shams University, Cairo, Egypt.
J Prosthodont. 2024 Oct;33(8):808-814. doi: 10.1111/jopr.13769. Epub 2023 Oct 3.
To evaluate the accuracy of tooth positions in printed complete dentures with different designs and teeth positioning techniques.
Five different designs of complete dentures and teeth positioning techniques were evaluated in this in vitro study. In Group I, the denture bases and teeth were designed as a single piece. In groups II and III, the denture bases were designed separately, and the denture teeth were designed as separate teeth. In groups IV and V, the denture bases were designed separately, and the denture teeth were designed as a single piece. Teeth positioning keys were designed for groups III and V. The dentures of all groups were scanned, and the data were imported to the surface matching software to evaluate the accuracy of the teeth positions. Statistical analysis was done using One -way ANOVA of Variance. The significance level was set at p ≤ 0.05.
The results showed that the highest deviations of the positions of the canines (0.0781 ± 0.0154 mm) and the first molars (0.0611 ± 0.0055 mm) were found in Group II. On the other hand, Group I showed the least deviations of the positions of the canines (0.0287 ± 0.0054 mm) and molars (0.0354 ± 0.005 mm).
The most accurate tooth positions are obtained in monolithic printed complete dentures. Fewer deviations in tooth positions occur when denture teeth are designed as a single piece.
评估不同设计和牙齿定位技术的印模全口义齿中牙齿位置的准确性。
本体外研究评估了五种不同设计的全口义齿和牙齿定位技术。在 I 组中，义齿基托和牙齿设计为一体。在 II 组和 III 组中，义齿基托单独设计，义齿牙单独设计。在 IV 组和 V 组中，义齿基托单独设计，义齿牙设计为一体。III 组和 V 组设计了牙齿定位键。所有组别的义齿均进行扫描，并将数据导入表面匹配软件以评估牙齿位置的准确性。使用方差的单因素 ANOVA 进行统计分析。显著性水平设置为 p≤0.05。
结果表明，II 组中犬齿（0.0781±0.0154mm）和第一磨牙（0.0611±0.0055mm）位置的偏差最大。另一方面，I 组中犬齿（0.0287±0.0054mm）和磨牙（0.0354±0.005mm）位置的偏差最小。
整体式打印全口义齿可获得最准确的牙齿位置。当义齿牙设计为一体时，牙齿位置的偏差较小。
