Department of Dental Materials and Prosthodontics, School of Dentistry, São Paulo State University, Araraquara, São Paulo, Brazil.
Department of Physical Chemistry, Institute of Chemistry, São Paulo State University, Araraquara, São Paulo, Brazil.
Am J Orthod Dentofacial Orthop. 2021 Jan;159(1):86-96. doi: 10.1016/j.ajodo.2020.04.020. Epub 2020 Nov 19.
Computer-aided design and manufacturing (CAD-CAM) systems have assisted orthodontists to position brackets virtually. The purpose of this study was to evaluate if a CAD-CAM system could predict the orthodontic treatment outcome of patients with Angle Class I malocclusion with mild crowding or spacing and with no need for orthodontic extraction.
Using the American Board of Orthodontics Cast-Radiograph Evaluation (ABO-CRE) and color map superimposition, the treated occlusion was compared with the virtual final occlusion of 24 young adults with Class I occlusion. Using eXceed software (eXceed, Witten, Germany), we created the final occlusion prediction for each patient (virtual set up group). A digital model of the final occlusion of each patient was created (treated occlusion group). ABO-CRE score was used to compare groups. In addition, a color map was created for all subjects to access the mean and range values between the virtual set up model and treated occlusion model of each patient. Random and systematic errors were calculated. In addition, chi-square and t test were used.
Comparisons between virtual set up occlusion and treated occlusion showed statistically significant differences in 3 out of 7 measurements: interproximal contact score was larger for treated than virtual occlusion (0.45 mm and 0.04 mm, respectively), and the treated occlusion showed larger values than the virtual occlusion for occlusal contacts (14.13 mm and 7.62 mm, respectively) and overjet (7.37 mm and 0.66 mm, respectively). Although the treated occlusion showed a larger score than the virtual occlusion (50.41 mm and 34.58 mm, respectively), there is no significant difference between both. Root angulation decreased (from 1.95 ± 1.29 to 0.65 ± 0.71) because of the treatment.
ABO-CRE overall score presents no difference between groups. In addition, CAD-CAM setup occlusion closely predicts the final teeth alignment and leveling with interarch relationships showing less ABO-CRE score deduction.
计算机辅助设计和制造(CAD-CAM)系统已经帮助正畸医生虚拟定位托槽。本研究的目的是评估 CAD-CAM 系统是否可以预测轻度拥挤或间隙的安氏 I 类错颌且无需正畸拔牙的患者的正畸治疗结果。
使用美国正畸医师协会铸型射线评估(ABO-CRE)和彩色图谱叠加,将治疗后的咬合与 24 名安氏 I 类错颌的年轻成人的虚拟最终咬合进行比较。我们使用 eXceed 软件(eXceed,德国威腾)为每个患者创建最终咬合的预测(虚拟设置组)。为每个患者创建最终咬合的数字模型(治疗组)。使用 ABO-CRE 评分比较两组。此外,为所有受试者创建了一个彩色图谱,以获取每个患者虚拟设置模型和治疗后模型之间的平均值和范围值。计算随机和系统误差。此外,还使用了卡方检验和 t 检验。
虚拟设置的咬合与治疗后的咬合相比,有 3 项测量结果存在统计学差异:治疗后的咬合的近中接触评分大于虚拟咬合(分别为 0.45mm 和 0.04mm),治疗后的咬合的咬合接触大于虚拟咬合(分别为 14.13mm 和 7.62mm),以及前牙覆盖(分别为 7.37mm 和 0.66mm)。尽管治疗后的咬合评分大于虚拟咬合(分别为 50.41mm 和 34.58mm),但两者之间没有显著差异。由于治疗,根倾斜度减小(从 1.95±1.29 减小到 0.65±0.71)。
ABO-CRE 总体评分在两组之间无差异。此外,CAD-CAM 设置的咬合与最终牙齿排列和牙弓关系的水平密切相关,显示出较少的 ABO-CRE 评分减少。