Evaluation of tip and torque on virtual study models: a validation study.
Evaluation of tip and torque on virtual study models: a validation study.
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DOI：
10.1186/2196-1042-14-19
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发表时间：
2013-07-26
影响因子：
4.8
通讯作者：
McNamara JA Jr
中科院分区：
文献类型：
--
作者：
Huanca Ghislanzoni LT;Lineberger M;Cevidanes LH;Mapelli A;Sforza C;McNamara JA Jr
本研究的目的是开发和验证一种新的分析方案，以测量虚拟研究模型牙弓中每颗牙齿的尖端和扭矩的线性和角度测量值。使用三维模型扫描仪扫描了25名具有完整恒牙列的受试者的上下颌牙模型。在每个模型上每个牙弓60个点被数字化，每个牙齿上5个点。开发了一种自定义分析，以测量尖端和扭矩的线性距离和角度，使用新的参考平面作为所有舌侧牙龈点之间的最佳拟合，将磨牙间舌侧距离设置为参考X轴。测量的直线距离包括颊侧、舌侧和尖牙、前磨牙和磨牙水平的质心横向宽度以及牙弓深度和牙弓周长。没有与所用方法相关的系统误差。组内相关系数值均高于0.70。上颌骨的平均随机误差为扭矩1.5° ± 0.4°，头端1.8° ± 0.5°，线性测量值0.4 ± 0.2 mm。下颌骨的平均随机误差为扭矩1.2° ± 0.3°，尖端2.0° ± 0.8°，线性测量0.1 ± 0.1 mm。提出了一种自定义数字分析协议，用于测量虚拟牙模型上的传统线性测量以及尖端和扭矩成角。该验证研究表明，本研究中使用的数字分析具有足够的重现性，为临床诊断和牙颌面研究提供了额外的信息和更准确的牙弓内测量。
The objectives of this study were to develop and validate a novel analysis protocol to measure linear and angular measurements of tip and torque of each tooth in the dental arches of virtual study models. Maxillary and mandibular dental casts of 25 subjects with a full permanent dentition were scanned using a three-dimensional model scanner. Sixty points per arch were digitized on each model, five points on each tooth. A custom analysis to measure linear distances and angles of tip and torque was developed using a new reference plane passing as a best-fit among all of the lingual gingival points, with the intermolar lingual distance set as the reference X-axis. The linear distances measured included buccal, lingual, and centroid transverse widths at the level of canines, premolars, and molars as well as arch depth and arch perimeter. There was no systematic error associated with the methodology used. Intraclass correlation coefficient values were higher than 0.70 on every measure. The average random error in the maxilla was 1.5° ± 0.4° for torque, 1.8° ± 0.5° for tip, and 0.4 ± 0.2 mm for linear measurements. The average random error in the mandible was 1.2° ± 0.3° for torque, 2.0° ± 0.8° for tip, and 0.1 ± 0.1 mm for the linear measurements. A custom digital analysis protocol to measure traditional linear measurements as well as tip and torque angulation on virtual dental casts was presented. This validation study demonstrated that the digital analysis used in this study has adequate reproducibility, providing additional information and more accurate intra-arch measurements for clinical diagnosis and dentofacial research.