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A Postoperative Evaluation Guideline for Computer-Assisted Reconstruction of the Mandible
Published on: January 28, 2020
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[Three-dimensional analysis of the mandible with impacted mandibular second molar]
Wei Fan1, De-Guo Gao2, Yu-Ting Wang1
1Jiangsu Key Laboratory of Oral Diseases, Nanjing Medical University, Nanjing 210000, China;Dept. of Orthodontics, Affiliated Hospital of Stomatological, Nanjing Medical University, Nanjing 210000, China.
Summary
Mandibular second molar impaction is linked to underdeveloped mandibles, showing reduced length and width. This suggests impacted molars may indicate a degeneration of mandibular development.
Area of Science:
- Orthodontics
- Oral and Maxillofacial Surgery
- Developmental Biology
Background:
- Impacted mandibular second molars are a common clinical finding.
- Understanding mandibular development in these cases is crucial for treatment planning.
Purpose of the Study:
- To investigate the developmental and morphological characteristics of the mandible in patients with impacted mandibular second molars.
- To predict mandibular development trends using three-dimensional (3D) analysis.
Main Methods:
- A comparative study involving 88 patients with impacted mandibular second molars and 88 controls.
- Utilized Mimics software for 3D measurements based on 23 landmark points and 17 parameters.
- Statistical analysis performed using the t-test.
Main Results:
- Patients with impacted mandibular second molars exhibited significantly shorter mandible length and reduced inter-molar and inter-angle distances.
- A higher submandibular angle value was observed in the impacted group.
- Width between first molars was also significantly lower in the impacted group.
Conclusions:
- Mandibular development, in terms of sagittal dimension and width, is compromised in individuals with impacted mandibular second molars.
- The impaction of the mandibular second molar may be a sign of underlying developmental degeneration.
