Evaluation of a photographic method to measure dental angulation

Objective: To analyze the reliability and reproducibility of a simplified method for analysis of dental angulation using digital photos of plaster dental casts. Methods: Digital and standardized photographs of plaster casts were performed and posteriorly imported to an angle reading graphic program in order to have measurements obtained. Such procedures were repeated to evaluate the random error and to analyze reproducibility through intraclass correlation. The sample consisted of 12 individuals (six male and six female) with full permanent dentition orthodontically untreated. The analyses were bilaterally carried out, and generated 24 measurements. Results: The random error showed variation of 0.77 to 2.55 degrees for teeth angulation. The statistical analysis revealed that the method presents excellent reproducibility (p研究目的：探讨采用石膏牙模数码照片开展牙角度简化分析方法的可靠性与可重复性。研究方法：对石膏牙模拍摄标准化数码照片，随后导入角度读取图形软件以获取测量数据。重复上述操作以评估随机误差，并通过组内相关分析（intraclass correlation）评价该方法的可重复性。研究样本包含12名恒牙列完整且未接受正畸治疗的个体（男性6名、女性6名）。该分析双侧开展，最终获得24组测量数据。研究结果：牙角度测量的随机误差波动范围为0.77°至2.55°。统计学分析显示，该方法具备极佳的可重复性（p