Ateşalp İleri Sema, Büyükerkmen Emine Begüm
Department of Prosthodontics, Faculty of Dentistry, Necmettin Erbakan University, Konya, Turkey.
J Adv Prosthodont. 2025 Aug;17(4):197-209. doi: 10.4047/jap.2025.17.4.197. Epub 2025 Aug 19.
This study aimed to evaluate the effect of clinically practical auxiliary geometric devices (AGD) on measurement trueness and scan time in full-arch implant-supported prostheses, focusing on different intraoral scanners (IOS) and implant angulations.
Four implants were planned in an edentulous maxillary arch and divided into two groups based on posterior implant angulation: Model A (Parallel) and Model B (30°). Each model was evaluated under three auxiliary geometric devices (AGD) application types (std, agd1, agd2), and scanned using three different intraoral scanners (IOSs) [3Shape Trios 3 (T), Medit i700 (M), and Cerec Primescan (PS)], resulting in nine groups per model (n = 10). Scanning times and faulty scans were recorded. A conventional impression (CON) was taken as a control and digitized with a desktop scanner. Trueness was analyzed using Geomagic Control X, with statistical significance set at < .05.
Group B had higher RMS values than Group A (40.3 µm vs. 34.7 µm). T_std in Group A (51.4 µm) and T_std (53.1 µm) and Con (50.7 µm) in Group B exceeded the acceptable deviation limit. AGDs reduced deviations to acceptable levels in the Trios 3. The Primescan scanner had the shortest scanning times. AGD use, especially in T_agd2 and M_agd2, shortened scan times and eliminated erroneous scans.
The use of AGD has a significant impact on scanners' scanning trueness and time.
本研究旨在评估临床实用的辅助几何装置（AGD）对全牙弓种植支持式修复体测量准确性和扫描时间的影响，重点关注不同的口内扫描仪（IOS）和种植体角度。
在上颌无牙颌弓中植入4颗种植体，并根据后部种植体角度分为两组：模型A（平行）和模型B（30°）。每个模型在三种辅助几何装置（AGD）应用类型（std、agd1、agd2）下进行评估，并使用三种不同的口内扫描仪（IOS）[3Shape Trios 3（T）、Medit i700（M）和Cerec Primescan（PS）]进行扫描，每个模型产生9组（n = 10）。记录扫描时间和错误扫描情况。采用传统印模（CON）作为对照，并用台式扫描仪进行数字化处理。使用Geomagic Control X分析准确性，设定统计学显著性为< 0.05。
B组的RMS值高于A组（40.3 µm对34.7 µm））。A组的T_std（51.4 µm）以及B组的T_std（53.1 µm）和Con（50.7 µm）超过了可接受的偏差限度。AGD将Trios 3中的偏差降低到可接受水平。Primescan扫描仪的扫描时间最短。使用AGD，尤其是在T_agd2和M_agd2中，缩短了扫描时间并消除了错误扫描。
AGD的使用对扫描仪的扫描准确性和时间有显著影响。
