数字化印模与石膏模型在拔牙病例中虚拟排牙与手动排牙的比较。

Comparison of virtual and manual tooth setups with digital and plaster models in extraction cases.

机构信息

Postgraduate student, Department of Orthodontics, College of Dentistry, Yonsei University, Seoul, Korea.

Associate professor, Department of Orthodontics, College of Dentistry, Yonsei University, Seoul, Korea.

出版信息

Am J Orthod Dentofacial Orthop. 2014 Apr;145(4):434-42. doi: 10.1016/j.ajodo.2013.12.014.

DOI:10.1016/j.ajodo.2013.12.014

PMID:24703281

Abstract

INTRODUCTION

The aim of this study was to compare the virtual and manual tooth setups with digital and plaster models in extraction cases by measuring various occlusal parameters and applying the American Board of Orthodontics objective grading system.

METHODS

Linear intra-arch and interarch dimensions (arch width and length, perimeter, overjet, and overbite), angular variables (tip, torque, and rotation), and American Board of Orthodontics objective grading system scores obtained from a digital virtual setup model were compared with those from a plaster model setup.

RESULTS

The digital virtual setup model resulted in smaller arch perimeters than did the plaster setup model by 2.20 mm in the maxillary arch (P <0.01) and 1.30 mm in the mandibular arch (P <0.05). The digital virtual setup also exhibited significantly lower values for overbite and overjet (P <0.01). The digital virtual setup had tendencies toward mesial angulation of the anterior teeth, labial inclination of the maxillary anterior teeth (P <0.05), and distal in-rotation of the mandibular teeth (P <0.05). The resulting American Board of Orthodontics objective grading system evaluation showed that larger deductions for overjet, occlusal contact, and total score (P <0.01) were required for the digital than for the manual setup model.

CONCLUSIONS

Digital and manual setups lead to similar measurements for intra-arch and interarch occlusal variables. However, because of the possibility of collision on proximal and occlusal contact, delicate adjustments in proximal and occlusal contacts are required.

摘要

简介

本研究旨在通过测量各种咬合参数并应用美国正畸委员会（American Board of Orthodontics）客观分级系统，比较拔牙病例中数字模型和石膏模型的虚拟牙位和手动牙位。

方法

比较数字虚拟牙位模型和石膏模型的线性牙弓内和牙弓间尺寸（牙弓宽度和长度、周长、覆合、覆盖）、角变量（切端、转矩和旋转）和美国正畸委员会客观分级系统评分。

结果

与石膏模型相比，数字虚拟牙位模型的牙弓周长更小，上颌牙弓减小 2.20mm（P<0.01），下颌牙弓减小 1.30mm（P<0.05）。数字虚拟牙位模型的覆合和覆盖也显著降低（P<0.01）。数字虚拟牙位模型还表现出前牙近中倾斜、上颌前牙唇倾（P<0.05）和下颌牙齿远中旋转的趋势（P<0.05）。美国正畸委员会客观分级系统的评估结果表明，数字模型需要更大的扣除分数，以补偿覆盖、咬合接触和总分的不足（P<0.01）。