Department of Oral and Maxillofacial Radiology, Faculty of Dentistry, Aydın Adnan Menderes University, Aydın, Turkey.
Department of Orthodontics, Faculty of Dentistry, Aydın Adnan Menderes University, Aydın, Turkey.
J Orofac Orthop. 2022 Oct;83(Suppl 1):102-110. doi: 10.1007/s00056-022-00406-6. Epub 2022 Jul 1.
This retrospective study aimed to determine whether a correlation exists between the fractal dimension value and overall orthodontic treatment duration in children and young adults.
The study included a total of 643 patients (age: 10-25 years) who received orthodontic treatment between January 2015 and March 2020. Patient records and pretreatment panoramic radiographs were evaluated. The regions of interest selected for calculating fractal dimension were the bilateral mental foramen regions of the mandible. Fractal dimension was set in relation to orthodontic treatment duration using a linear regression model which was also adjusted for potential confounding variables. Total treatment duration was the outcome variable of interest used as a continuous variable. The predictor variables of interest included age, gender, type of dental and skeletal malocclusion, vertical growth pattern, extraction type, and fractal dimension.
The mean age, treatment duration, and fractal dimension were 14.56 years, 27.01 months, and 1.23 mm, respectively. Multiple linear regression analysis showed that the fractal dimension had a significant influence on overall treatment duration (P < 0.001). From the other variables, Angle class II malocclusion significantly influenced treatment duration (P < 0.01), age showed a significant negative correlation with treatment duration (P < 0.01), and treatment duration significantly increased for patients with tooth extractions (P < 0.001).
There was a negative correlation between fractal dimensions at the mandibular mental region and total orthodontic treatment duration. Fractal dimension analysis may help to understand physiologic features of alveolar bone and predict orthodontic tooth movement.
本回顾性研究旨在确定儿童和青少年下颌双侧颏孔区分形维数值与正畸治疗总时长之间是否存在相关性。
该研究共纳入 643 名（年龄：10-25 岁）于 2015 年 1 月至 2020 年 3 月期间接受正畸治疗的患者。评估了患者的病历和治疗前全景片。选择双侧下颌颏孔区域作为计算分形维数值的感兴趣区。使用线性回归模型，根据正畸治疗时长对分形维数值进行设置，该模型还对潜在的混杂变量进行了调整。总治疗时长是作为连续变量的感兴趣的结局变量。感兴趣的预测变量包括年龄、性别、牙颌和骨骼错畸形类型、垂直生长型、拔牙类型和分形维数值。
平均年龄、治疗时长和分形维数值分别为 14.56 岁、27.01 个月和 1.23 mm。多元线性回归分析显示，分形维数值对整体治疗时长有显著影响（P < 0.001）。在其他变量中，安氏 II 类错畸形显著影响治疗时长（P < 0.01），年龄与治疗时长呈显著负相关（P < 0.01），拔牙患者的治疗时长显著增加（P < 0.001）。
下颌双侧颏孔区的分形维数值与正畸治疗总时长呈负相关。分形维数分析有助于了解牙槽骨的生理特征，并预测正畸牙齿移动。
