Assistant lecturer, Prosthodontic department, Faculty of Dentistry, Tanta University, Tanta, Egypt.
Professor, Prosthodontic department, Faculty of Dentistry, Tanta University, Tanta, Egypt.
BMC Oral Health. 2024 Jul 5;24(1):764. doi: 10.1186/s12903-024-04495-0.
This clinical study aims to evaluate the accuracy of the conventional implant impression techniques compared to the digital impression ones in bilateral distal extension cases.
A total of 32 implants were placed in eight patients missing all mandibular posterior teeth except the first premolars. Each patient received a total of four implants, with two implants placed on each side, in order to provide support for three units of screw-retained zirconia restorations. Following osteointegration, the same patient underwent two implant-level impression techniques: Conventional open-tray impressions CII (splinted pick-up) and digital implant impressions DII with TRIOS 3 Shape intraoral scanner. The accuracy of impressions was evaluated utilizing a three-dimensional superimposition analysis of standard tessellation language (STL) files. Subsequently, the scan bodies were segmented using Gom inspect software to measure three-dimensional deviations in a color-coding map. Data were statistically analyzed using the Kruskal Wallis test and then a post-hoc test to determine the significance level (P < 0.05).
The study revealed that higher angular and positional deviations were shown toward distal scan bodies compared to mesial ones for both impression techniques. However, this difference was not statistically significant (P > 0.05).
Splinted open-tray conventional impression and intraoral scanning implant impression techniques have demonstrated comparable accuracy.
Clinical Trials.gov Registration ID NCT05912725. Registered 22/06/ 2023- Retrospectively registered, https://register.
gov .
本临床研究旨在评估传统种植体印模技术与数字化印模技术在双侧远中游离缺失病例中的准确性。
共将 32 颗种植体植入 8 名患者体内，这些患者下颌后牙除了第一前磨牙外全部缺失。每位患者共植入四颗种植体，每侧两颗，以支撑三颗螺丝固位氧化锆修复体。在骨整合后，同一位患者接受了两种种植体水平印模技术：传统开放式托盘印模 CII（夹板式取模）和数字化种植体印模 DII，使用 TRIOS 3Shape 口内扫描仪。使用标准 tessellation language (STL) 文件的三维叠加分析评估印模的准确性。随后，使用 Gom inspect 软件对扫描体进行分割，以在彩色编码图中测量三维偏差。使用 Kruskal Wallis 检验和事后检验来确定显著性水平（P < 0.05）对数据进行统计分析。
研究表明，两种印模技术的远中扫描体的角度和位置偏差均高于近中扫描体，但差异无统计学意义（P > 0.05）。
夹板式开放式托盘传统印模和口内扫描种植体印模技术具有相当的准确性。
ClinicalTrials.gov 注册号 NCT05912725。2023 年 6 月 22 日注册-回顾性注册，https://register.
gov.
