Sawangsri Kedith, Leelaluk Satita, Ellakany Passent, Wade Adam B, Eid Hana W, Zaitseva Daryna, Nassani Leonardo M, Hammoudeh Hanin S
Clinical Assistant Professor, Division of Restorative and Prosthetic Dentistry, The Ohio State University College of Dentistry, Columbus, Ohio.
Resident, Advanced Prosthodontics Program, The Ohio State University College of Dentistry, Columbus, Ohio.
J Prosthet Dent. 2025 Aug;134(2):462-468. doi: 10.1016/j.prosdent.2025.03.022. Epub 2025 Apr 10.
The use of intraoral scanners (IOSs) to digitize complete dentures has been widely adopted. However, the impact of operator experience, scanning patterns, and arch location on the accuracy and scanning time of complete dentures digitized with an IOS is unclear.
The purpose of this in vitro study was to investigate the impact of user experience, scanning patterns, and arch location on the trueness and scanning time of complete dentures digitized with an IOS.
One maxillary and 1 mandibular complete denture were fabricated and scanned using a desktop scanner (E4) to be used as the reference scans. Three experienced (Exp) and 3 inexperienced (Inexp) operators performed denture digitization using an IOS (TRIOS 4) with 2 different scanning patterns: the manufacturer's recommended (MA) and the rolling (RO) scan strategy (n=10). The scanning time for each scan was recorded. Using a 3-dimensional (3D) inspection software program (Geomagic Control X), corresponding test scans were compared with the reference scan using overall best-fit alignment to analyze the trueness (root mean square, RMS). Three-way ANOVA followed by the Bonferroni post hoc tests were applied to analyze the effect of user experience, scanning patterns, and arch location on the trueness and scanning time (α=.05). Qualitative analysis of trueness was performed by using 3D color mapping.
For the trueness of maxillary denture digitization, the Inexp MA group demonstrated the highest RMS value (0.144 ±0.060 mm), while the Exp MA showed the lowest RMS value (0.118 ±0.019 mm). The trueness of mandibular denture digital duplicates exhibited comparable RMS values, ranging from 0.096 ±0.016 mm to 0.101 ±0.017 mm. Analysis of variance revealed significant effects of both arch location and operator experience on the trueness of denture digitization using an intraoral scanner (IOS) (P<.001 and P=.001, respectively). Maxillary digital duplicates exhibited significantly higher RMS values than their mandibular counterparts. Additionally, maxillary duplicates obtained by experienced operators had lower RMS values than those obtained by inexperienced operators. Operator experience also significantly influenced scanning time (P<.01), with experienced operators requiring less time than inexperienced operators, regardless of scanning pattern. Qualitative analysis using 3D color mapping identified increased discrepancies in the maxillary palatal area in scans acquired by inexperienced operators.
Operator experience and arch location significantly impacted the trueness of maxillary denture digitization, while only operator experience significantly influenced the scanning time of maxillary and mandibular denture digitization using an IOS.
使用口内扫描仪（IOS）对全口义齿进行数字化已被广泛采用。然而，操作员经验、扫描模式和牙弓位置对使用IOS数字化全口义齿的准确性和扫描时间的影响尚不清楚。
本体外研究的目的是调查用户经验、扫描模式和牙弓位置对使用IOS数字化全口义齿的准确性和扫描时间的影响。
制作一副上颌和一副下颌全口义齿，并用台式扫描仪（E4）进行扫描，作为参考扫描。三名经验丰富（Exp）和三名经验不足（Inexp）的操作员使用IOS（TRIOS 4）以两种不同的扫描模式对义齿进行数字化：制造商推荐的（MA）和滚动（RO）扫描策略（n = 10）。记录每次扫描的时间。使用三维（3D）检测软件程序（Geomagic Control X），通过整体最佳拟合对齐将相应的测试扫描与参考扫描进行比较，以分析准确性（均方根，RMS）。应用三因素方差分析，随后进行Bonferroni事后检验，以分析用户经验、扫描模式和牙弓位置对准确性和扫描时间的影响（α = 0.05）。通过使用3D颜色映射对准确性进行定性分析。
对于上颌义齿数字化的准确性，Inexp MA组的RMS值最高（0.144±0.060 mm），而Exp MA组的RMS值最低（0.118±0.019 mm）。下颌义齿数字复制品的准确性表现出相当的RMS值，范围从0.096±0.016 mm到0.101±0.017 mm。方差分析显示，牙弓位置和操作员经验对使用口内扫描仪（IOS）进行义齿数字化的准确性均有显著影响（分别为P <.001和P = 0.001）。上颌数字复制品的RMS值显著高于下颌数字复制品。此外，经验丰富的操作员获得的上颌复制品的RMS值低于经验不足的操作员获得的RMS值。操作员经验也显著影响扫描时间（P <.01），无论扫描模式如何，经验丰富的操作员所需时间都比经验不足的操作员少。使用3D颜色映射的定性分析发现，经验不足的操作员采集的扫描在上颌腭部区域的差异增加。
操作员经验和牙弓位置对上颌义齿数字化的准确性有显著影响，而只有操作员经验对使用IOS进行上颌和下颌义齿数字化的扫描时间有显著影响。
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