Agustín-Panadero Rubén, Estada María Isabel Clemente, Alonso Pérez-Barquero Jorge, Zubizarreta-Macho Álvaro, Revilla-León Marta, Gómez-Polo Miguel
Associate Professor, Department of Stomatology, Faculty of Medicine and Dentistry, University of Valencia, Spain.
Private Practice, Valencia, Spain.
J Prosthet Dent. 2025 Mar;133(3):865-871. doi: 10.1016/j.prosdent.2023.04.002. Epub 2023 May 18.
Intraoral scanners (IOSs) have been used in dentistry for diagnostic and treatment purposes; however, the influence of environmental factors such as humidity or temperature on the accuracy of intraoral scanning is uncertain.
The purpose of this in vitro study was to evaluate the influence of relative humidity and ambient temperature on the accuracy, scanning time, and number of photograms of dentate complete arch intraoral digital scans.
A completely dentate mandibular typodont was digitized by using a dental laboratory scanner. Four calibrated spheres were attached following the International Organization for Standardization (ISO) standard 20 896. A watertight box was designed to simulate 4 different relative humidity conditions (50%, 70%, 80%, and 90%) (n = 30). An IOS (TRIOS 3) was used to obtain a total of 120 complete arch digital scans (n = 120). Scanning time and number of photograms of each specimen were recorded. All the scans were exported and compared with the master cast by using a reverse engineering software program. The linear distances among the reference spheres were used to calculate trueness and precision. A unifactorial analysis of variance (ANOVA) and Levene tests followed by the post hoc Bonferroni test were used to analyze trueness and precision data, respectively. A unifactorial ANOVA followed by a post hoc Bonferroni test was also conducted to analyze scanning time and the number of photogram data.
Statistically significant differences were found in trueness, precision, number of photograms, and scanning time (P<.05). Regarding trueness and precision, significant differences were found between the 50% and 70% relative humidity groups and the 80% and 90% relative humidity groups (P<.01). Regarding scanning time and number of photograms, significant differences were obtained among all groups, except between the 80% and 90% relative humidity groups (P<.01).
The relative humidity conditions tested influenced accuracy, scanning time, and number of photograms in complete arch intraoral digital scans. High relative humidity conditions resulted in the decreased scanning accuracy, longer scanning time, and greater number of photograms of complete arch intraoral digital scans.
口腔内扫描仪（IOS）已在牙科领域用于诊断和治疗目的；然而，湿度或温度等环境因素对口腔内扫描准确性的影响尚不确定。
本体外研究的目的是评估相对湿度和环境温度对有牙列全牙弓口腔内数字扫描的准确性、扫描时间和照片数量的影响。
使用牙科实验室扫描仪对完全牙列的下颌模型进行数字化处理。按照国际标准化组织（ISO）标准20896附着四个校准球体。设计一个防水箱以模拟4种不同的相对湿度条件（50%、70%、80%和90%）（n = 30）。使用一台IOS（TRIOS 3）总共获得120次全牙弓数字扫描（n = 120）。记录每个样本的扫描时间和照片数量。所有扫描结果均导出，并使用逆向工程软件程序与主模型进行比较。参考球体之间的线性距离用于计算准确性和精确性。分别使用单因素方差分析（ANOVA）和Levene检验，随后进行事后Bonferroni检验来分析准确性和精确性数据。还进行了单因素方差分析，随后进行事后Bonferroni检验来分析扫描时间和照片数量数据。
在准确性、精确性、照片数量和扫描时间方面发现了统计学上的显著差异（P <.05）。在准确性和精确性方面，50%和70%相对湿度组与80%和90%相对湿度组之间存在显著差异（P <.01）。在扫描时间和照片数量方面，除80%和90%相对湿度组之间外，所有组之间均存在显著差异（P <.01）。
所测试的相对湿度条件影响了全牙弓口腔内数字扫描的准确性、扫描时间和照片数量。高相对湿度条件导致全牙弓口腔内数字扫描的准确性降低、扫描时间延长和照片数量增加。
