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Relationship between the impacted mandibular third molar and adjacent second molar' external root resorption by
1Department of Stomatology Affiliated Hospital of Yanbian University No.1327 of Juzi Road, Xinxing District Yanji 133000, China lijingxuld@126.com.
Medicina Oral, Patologia Oral Y Cirugia Bucal
|November 22, 2023
Summary
Impacted mandibular third molars can cause external root resorption in the adjacent second molar. Factors like impaction angle, direction, depth, and mandibular anatomy significantly influence this risk, with specific types posing a greater threat.
Area of Science:
- Dentistry
- Oral and Maxillofacial Surgery
- Radiology
Background:
- Investigated the link between impacted mandibular third molars (IMTM) and external root resorption (ERR) of the mandibular second molar (MSM).
- Utilized cone-beam computed tomography (CBCT) for detailed analysis of tooth root structures.
- Aimed to identify risk factors contributing to MSM external root resorption.
Purpose of the Study:
- To analyze the correlation between IMTM characteristics and the occurrence/severity of MSM ERR.
- To examine the influence of mandibular anatomy on the development of MSM ERR.
- To provide a reference for predicting and managing ERR associated with IMTM.
Main Methods:
- Retrospective analysis of 327 patients (578 teeth) undergoing IMTM extraction.
- Evaluation of IMTM inclination angle, impaction direction, and depth.
- Assessment of mandibular ascending ramus classification and its association with MSM ERR.
Main Results:
- Higher ERR incidence observed in males (27.9%) compared to females (17.6%).
- Significant associations found between ERR occurrence and IMTM inclination angle, impaction direction (mesial, horizontal), and depth (low, median).
- Mandibular ascending ramus type III showed a strong correlation with increased ERR severity.
Conclusions:
- IMTM inclination angle, impaction direction, and depth are key factors influencing MSM ERR.
- Mandibular ascending ramus type is also a significant contributing factor to ERR.
- Mesioangular IMTM with lower impaction depth and Type III ramus are associated with more severe MSM ERR.
