Gonca Merve, Gunacar Dilara Nil, Kose Taha Emre, Karamehmetoglu Irem
Department of Orthodontics, Faculty of Dentistry, Recep Tayyip Erdoğan University, Rize, Turkey.
Department of Oral and Maxillofacial Radiology, Faculty of Dentistry, Recep Tayyip Erdoğan University, Rize, Turkey.
Oral Radiol. 2022 Jan;38(1):63-71. doi: 10.1007/s11282-021-00527-5. Epub 2021 Apr 18.
To investigate mandibular morphologic measurements and trabecular structures that may cause mandibular third molar (MM3) impaction according to MM3 subgroups.
A total of 150 MM3 of 2175 panoramic radiographs (PRs) were reviewed. MM3s according to Winter (vertical), Pell & Gregory Class 1 and group: A, B, C on PRs were included in the study group. Fractal dimensions (FD) and mandibular morphologic measurements were evaluated. Statistical analysis for parametric values was performed using one-way analysis of variance (ANOVA). Statistical analysis for non-parametric values was performed using the Kruskal-Wallis H test.
Statistically, a significant difference was found only in terms of angle of impaction among the groups of MM3 (p < 0.05) [Winter (vertical), and Pell & Gregory Class 1 and group A, B, C]. There was no difference among groups A, B, C in mandibular morphology and trabecular structure, but group C showed different characteristics than the other groups only in terms of impaction angle.
The trabecular structure and morphometric properties except for the angle of impaction do not affect impacted MM3s with adequate retromolar space and vertical angle.
根据下颌第三磨牙（MM3）亚组，研究可能导致MM3阻生的下颌形态测量和小梁结构。
回顾了2175张全景片（PR）中的150颗MM3。根据Winter（垂直型）、Pell & Gregory 1类以及PR上的A、B、C组的MM3被纳入研究组。评估分形维数（FD）和下颌形态测量。参数值的统计分析采用单因素方差分析（ANOVA）。非参数值的统计分析采用Kruskal-Wallis H检验。
统计学上，仅在MM3组（Winter（垂直型）、Pell & Gregory 1类以及A、B、C组）之间的阻生角度方面发现显著差异（p < 0.05）。A、B、C组在下颌形态和小梁结构上无差异，但C组仅在阻生角度方面表现出与其他组不同的特征。
除阻生角度外，小梁结构和形态测量特性不会影响具有足够磨牙后间隙和垂直角度的阻生MM3。
