Malik Ovais H, Stevenson Helen, Mandall N A, Alsaeed Mubarak A
Aust Orthod J. 2016 Nov;32(2):221-228.
The aim'of the present study was to investigate whether the same orthodontic information can be obtained from study models or photographs of study models in order to assess the Index of Orthodontic Treatment Need (IOTN). The study also aimed to assess inter- and intra-examiner reliability in the assessment of orthodontic treatment need.
Thirty sets of start and finish study models, demonstrating a range of malocclusions, were non-randomly obtained from patients treated at the University of Manchester Dental Hospital. The start models demonstrated a range of malocclusions (according to The British Standard Institute Incisor Classification 1983) of varying complexity.
Six photographic views of each set of study models were taken against a dark background. Millimetric distances were determined by using dividers to measure photographic distances and actual distances in millimeters from a ruler embedded in the image. Four examiners assessed the study models and photographs of the models in a random order and the Aesthetic and Dental Health components of the IOTN were recorded.
There were no statistically significant differences in the IOTN scores from photographs of study models compared with IOTN scoresrom study models of the same patient.
The IOTN scores derived from photographs of study models are valid and reliable measures of malocclusion.
本研究的目的是调查是否可以从研究模型或研究模型的照片中获得相同的正畸信息，以评估正畸治疗需求指数（IOTN）。该研究还旨在评估检查者之间和检查者内部在评估正畸治疗需求方面的可靠性。
从曼彻斯特大学牙科医院接受治疗的患者中，非随机获取了30套起始和结束时的研究模型，这些模型展示了一系列错颌畸形。起始模型展示了一系列根据1983年英国标准协会切牙分类法划分的、复杂度各异的错颌畸形。
以深色背景为背景，拍摄每组研究模型的六个照片视图。通过使用两脚规测量照片距离以及图像中嵌入的尺子上以毫米为单位的实际距离来确定毫米距离。四名检查者以随机顺序评估研究模型及其照片，并记录IOTN的美学和牙齿健康组成部分。
与同一患者研究模型的IOTN分数相比，研究模型照片的IOTN分数没有统计学上的显著差异。
从研究模型照片得出的IOTN分数是错颌畸形的有效且可靠的测量指标。
