Does Mandibular Gonial Angle Influence the Eruption Pattern of the Lower Third Molar? A Three-Dimensional Study
| Autor: | Danila Muraca, Selene Barone, Amerigo Giudice, Federica Diodati, Francesco Bennardo, Alessandro Antonelli, Fiorella Averta |
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| Rok vydání: | 2021 |
| Předmět: |
Molar
Orthodontics Cone beam computed tomography facial typology gonial angle business.industry Mandible Mandibular canal third molar impaction General Medicine lower third molar Article Sagittal plane medicine.anatomical_structure stomatognathic system J&D classification Retromolar space Coronal plane Medicine Gonial angle business |
| Zdroj: | Journal of Clinical Medicine Volume 10 Issue 18 Journal of Clinical Medicine, Vol 10, Iss 4057, p 4057 (2021) |
| ISSN: | 2077-0383 |
| DOI: | 10.3390/jcm10184057 |
| Popis: | Lower third molars (M3M) are the most frequent impacted teeth. The aim of this study was to evaluate the correlation between M3M position and gonial angle. A retrospective cross-sectional study was conducted. The study population included patients with unilateral or bilateral M3M and underwent Cone Beam Computed Tomography. A morphometric analysis of the mandible was performed after three-dimensional reconstruction, recording gonial angle (GA), ramus high, ramus width, ramus divergency, and retromolar space. GA was the primary predictor variable. The primary outcome variable was the position of M3M analyzed in sagittal, axial, and coronal planes. Descriptive, bivariate, and multiple regression statistics were performed (p < 0.05). Study sample included 172 patients (mean age: 26.3 ± 4.6 years) 266 M3Ms were analyzed. The average GA was 122.6° ± 4.8°. A reduced GA value was significantly associated with a deeply impacted M3M in the ramus. With a progressive decrease of GA, M3M assumed a more horizontal position closer to the mandibular canal (p < 0.05). A lower GA showed a reduced retromolar space with more complex impacted M3M (p < 0.05). The results confirm a statistically significant correlation between GA and the position of M3M. Higher incidence of impacted M3M was related to a reduction of the GA value. |
| Databáze: | OpenAIRE |
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