Kurt Mehmet Hakan, Yilmaz Serkan, Evli Cengiz, Karahan Sevilay
Faculty of Dentistry, Department of Dentomaxillofacial Radiology, Ankara University, Ankara, Turkey.
Faculty of Dentistry Department of Dentomaxillofacial Radiology, Erciyes University, Kayseri, Turkey.
J Oral Rehabil. 2023 May;50(5):360-369. doi: 10.1111/joor.13435. Epub 2023 Feb 26.
This study aimed to compare the trabecular internal structure of different regions of the mandible according to the grades of appositional classification in the mandible angle region in probable bruxist individuals and non-bruxist G0(Convex course of the basal cortex, no directional change, no bone apposition) individuals by measuring fractal dimension (FD) on panoramic radiographs.
200 sample jaws, bilaterally, of 80 probable bruxists and 20 non-bruxist G0 individuals were included in the study. According to the classification in the literature, each mandible angle apposition severity was classified as G0-G1-G2-G3. FD was calculated by selecting the region of interest (ROI) area of 7 regions from each sample. Gender differences in changes between ROIs in radiographs and independent samples t-test were evaluated. Relation between categorical variables was determined by chi-square test (p < .05).
In the comparison of the probable bruxist and non-bruxist G0 groups, FD was found to be statistically significantly higher in the mandible angle (p = 0.013) and cortical bone (p = 0.000) regions in the probable bruxist group than in the non-bruxist G0 group. There is a statistically significant difference between probable bruxist G0 and non-bruxist G0 grades in terms of FD averages in cortical bone (p < 0.001). A statistically significant difference was found in the relationship of ROIs with gender in canine apex (p = 0.021) and canine distal (p = 0.041) regions.
FD was found to be higher in the mandibular angle region and cortical bone in probable bruxist individuals than in non-bruxist G0 individuals. Morphological changes seen in the mandible angulus region may be a finding that may raise suspicion for bruxism for clinicians.
本研究旨在通过测量全景X线片上的分形维数（FD），比较可能患有磨牙症的个体和非磨牙症G0（基底部皮质呈凸形走行，无方向改变，无骨质增生）个体下颌角区域不同部位的小梁内部结构，这些部位根据下颌骨的对位分级。
本研究纳入了80名可能患有磨牙症的个体和20名非磨牙症G0个体的200个双侧样本颌骨。根据文献中的分类，将每个下颌角对位严重程度分为G0 - G1 - G2 - G3。通过从每个样本中选择7个区域的感兴趣区域（ROI）面积来计算FD。评估X线片中ROI之间变化的性别差异以及独立样本t检验。通过卡方检验确定分类变量之间的关系（p < 0.05）。
在可能患有磨牙症的组和非磨牙症G0组的比较中，发现可能患有磨牙症的组在下颌角（p = 0.013）和皮质骨（p = 0.000）区域的FD在统计学上显著高于非磨牙症G0组。在皮质骨中，可能患有磨牙症的G0级和非磨牙症G0级在FD平均值方面存在统计学显著差异（p < 0.001）。在犬根尖（p = 0.021）和犬远中（p = 0.041）区域，发现ROI与性别的关系存在统计学显著差异。
发现可能患有磨牙症的个体在下颌角区域和皮质骨中的FD高于非磨牙症G0个体。在下颌角区域观察到的形态学变化可能是临床医生对磨牙症产生怀疑的一个发现。
