Jaber Samer T, Hajeer Mohammad Y, Alkhouli Khaled Walid, Al-Shamak Rabab Mohamad, Darwich Khaldoun M A, Aljabban Ossama, Alam Mohammad Khursheed, Kara-Boulad Jehad M
Department of Orthodontics, Faculty of Dentistry, Al-Watanyia Private University, Hama, SYR.
Department of Orthodontics, Faculty of Dentistry, University of Damascus, Damascus, SYR.
Cureus. 2024 Feb 25;16(2):e54869. doi: 10.7759/cureus.54869. eCollection 2024 Feb.
The study's objective was to assess the dimensional accuracy and reliability of dental digital models prepared by direct intraoral scanning and indirect scanning of the plaster models compared to the plaster models as the gold standard.
This study included 20 patients. Nine had a class I malocclusion, seven had a class II malocclusion, and four had a class III malocclusion. Intraoral scanning was done for the upper and lower arches of all the patients enrolled in this study using an intraoral scanner (i700; Medit, Seoul, Korea). The next step was preparing the plaster model for the control group. Addition-silicone impressions were taken for each patient's arches. The impressions were poured according to American Board of Orthodontics (ABO) standards. Finally, the digital models of the indirect scanning group were prepared using a 3D desktop scanner (T710; Medit). In total, 26 measurements were made on the plaster and digital models. Paired t-tests were used to test for significant differences between the studied groups. The reliability of the studied techniques was tested using intraclass correlation coefficients (ICCs). Because of the multiple comparisons, the ɑ level was adjusted and set at 0.002.
No significant differences were found between the intraoral scanning group (20 patients) and the plaster models group (20 patients; P>0.002). The ICCs ranged from 0.814 to 0.993, indicating excellent agreement between the direct digital and traditional plaster models. There were no significant differences between the digital and original plaster models (P>0.002). ICCs ranged from 0.834 to 0.995, indicating excellent agreement between the indirect digital and original plaster models. No significant differences were detected between the direct and indirect digital models (P>0.002). ICCs ranged between 0.813 and 0.999, indicating excellent agreement between direct and indirect digital models.
Both direct and indirect scanning techniques are accurate and reliable for digital model preparation and can be considered an alternative to traditional plaster models used in clinical orthodontics diagnostic applications. The intraoral scanning technique can be considered a valid alternative for indirect scanning of the plaster models to prepare digital working models during the digital design and fabrication of orthodontic appliances such as clear aligners.
本研究的目的是评估与作为金标准的石膏模型相比，通过直接口内扫描和石膏模型间接扫描制备的牙科数字模型的尺寸精度和可靠性。
本研究纳入20例患者。其中9例为安氏I类错牙合，7例为安氏II类错牙合，4例为安氏III类错牙合。使用口内扫描仪（i700；Medit，韩国首尔）对本研究纳入的所有患者的上下牙弓进行口内扫描。下一步是为对照组制备石膏模型。对每位患者的牙弓取加成型硅橡胶印模。按照美国正畸委员会（ABO）标准灌注印模。最后，使用三维桌面扫描仪（T710；Medit）制备间接扫描组的数字模型。总共在石膏模型和数字模型上进行了26次测量。采用配对t检验来检验研究组之间的显著差异。使用组内相关系数（ICC）来检验所研究技术的可靠性。由于进行了多次比较，将ɑ水平调整并设定为0.002。
口内扫描组（20例患者）与石膏模型组（20例患者）之间未发现显著差异（P>0.002）。ICC范围为0.814至0.993，表明直接数字模型与传统石膏模型之间具有极好的一致性。数字模型与原始石膏模型之间无显著差异（P>0.002）。ICC范围为0.834至0.995，表明间接数字模型与原始石膏模型之间具有极好的一致性。直接数字模型与间接数字模型之间未检测到显著差异（P>0.002）。ICC范围在0.813至0.999之间，表明直接数字模型与间接数字模型之间具有极好的一致性。
直接和间接扫描技术在数字模型制备方面均准确可靠，可被视为临床正畸诊断应用中传统石膏模型的替代方法。在正畸矫治器（如透明矫治器）的数字设计和制作过程中，口内扫描技术可被视为石膏模型间接扫描以制备数字工作模型的有效替代方法。
