Clinical Demonstrator, Department of Orthodontics, Faculty of Dentistry, Mansoura University, Mansoura, Egypt.
Assistant Professor, Department of Orthodontics, Faculty of Dentistry, Mansoura University, Mansoura, Egypt.
BMC Oral Health. 2024 Aug 29;24(1):1008. doi: 10.1186/s12903-024-04715-7.
Many indices have been suggested to help orthodontists in predicting the ideal dental arch width. One of these was Pont's index which was established by Pont. He suggested equations to predict the ideal maxillary dental arch width (interpremolar and intermolar) from the combined mesiodistal width of the maxillary incisors. This study aimed to test the applicability of Pont's index as an orthodontic diagnostic tool in Egyptian population and to compare the results with those obtained from studies of different ethnic subjects.
This study was performed using dental casts of 184 Egyptian individuals (82 males and 102 females; age range, 19-24 years). The casts were divided into 46 casts with normal occlusion, 46 casts with class I, 46 casts with class II and 46 casts with class III malocclusion, according to Angle's classification. Alginate impressions were taken for all patients and poured immediately using dental plaster. The real models were transformed into digital models using three-dimensional laser scanner to allow digital model analysis. Predicted arch widths were calculated using Pont's equations. The predicted values were compared to the measured values.
Intra class correlation coefficient (ICC) (absolute agreement) between measured and predicted arch widths was determined. Poor absolute agreement was found between measured arch width values and the corresponding values calculated according to Pont's index.
According to the results of this study, Pont's index is not a reliable method for predicting the ideal dental arch widths in Egyptian populations.
许多指标都被建议帮助正畸医生预测理想的牙弓宽度。其中一个是Pont 指数，由 Pont 建立。他提出了从上颌切牙的近远中宽度预测理想上颌牙弓宽度（尖牙间和磨牙间）的方程。本研究旨在测试 Pont 指数作为埃及人群中正畸诊断工具的适用性，并将结果与来自不同种族受试者的研究结果进行比较。
本研究使用了 184 名埃及个体（82 名男性和 102 名女性；年龄范围为 19-24 岁）的牙模。牙模根据 Angle 分类分为 46 个正常咬合组、46 个 I 类组、46 个 II 类组和 46 个 III 类组。所有患者均取藻酸盐印模，并立即使用牙科石膏浇铸。真实模型通过三维激光扫描仪转换为数字模型，以允许进行数字模型分析。使用 Pont 方程计算预测的牙弓宽度。将预测值与实测值进行比较。
测量和预测牙弓宽度之间的组内相关系数（ICC）（绝对一致性）。实测牙弓宽度值与根据 Pont 指数计算的相应值之间存在较差的绝对一致性。
根据本研究的结果，Pont 指数不是预测埃及人群理想牙弓宽度的可靠方法。
