External Root Resorption of Second Molar Associated with Mesially Impacted Mandibular Third Molar Based on CBCT

doi:10.13701/j.cnki.kqyxyj.2022.10.014

Abstract

Abstract: Objective: To analyze the relationship between mandibular third molar (MTM) and external root resorption (ERR) of mandibular second molar by CBCT. Methods: CBCT scans involving 302 MTMs were assessed. The patient gender and age, mesial angulation and impaction depths of MTMs, and MTMMCEJ-MSMDCEJ distances and contact point localization were assessed. The relationship between each factor and the ERR was analyzed. Results: The detection rate of ERR in second molars was 15.89%. Age, the angle of occlusion between MTM and mandibular second molar, and MTMMCEJ-MSMDCEJ were identified as risk factors for ERR. When the age≥35 years, the angle of occlusion was 45°-60°, and MTMMCEJ-MSMDCEJ＞6 mm, ERR was significantly increased. Conclusion: The age (≥35 years), the angle of occlusion 45°-60°, and MTMMCEJ-MSMDCEJ (>6 mm) could be regarded as the guidelines for preventive removal of MTM.

Key words: mandibular third molar, mesial impaction, mandibular second molar, ERR, CBCT

YU Tianping, WANG Rong, YANG Bin. External Root Resorption of Second Molar Associated with Mesially Impacted Mandibular Third Molar Based on CBCT[J]. Journal of Oral Science Research, 2022, 38(10): 968-971.

References

[1] Singh P, Nath P, Bindra S, et al. The predictivity of mandibular third molar position as a risk indicator for pericoronitis: A prospective study[J]. Natl J Maxillofac Surg, 2018, 9(2):215-221.
[2] Chen YN, Zheng JM, Li DN, et al. Three-dimensional position of mandibular third molars and its association with distal caries in mandibular second molars: a cone beam computed tomographic study[J]. Clin Oral Invest, 2020, 24(9):3265-3273.
[3] Nunn ME, Fish MD, Garcia RI, et al. Retained asymptomatic third molars and risk for second molar pathology[J]. J Dent Res, 2013, 92(12): 1095-1099.
[4] Wang DM, He XT, Wang YL, et al. External root resorption of the second molar associated with mesially and horizontally impacted mandibular third molar: evidence from cone beam computed tomography[J]. Clin Oral Invest, 2017, 21(4):1335-1342.
[5] Yamaoka M, Furusawa K, Ikeda M, et al. Root resorption of mandibular second molar teeth associated with the presence of the third molars[J]. Aust Dent J, 1999, 44(2):112-116.
[6] Li D, Tao Y, Cui M, et al. External root resorption in maxillary and mandibular second molars associated with impacted third molars: a cone-beam computed tomographic study[J]. Clin Oral Invest, 2019, 23(12):4195-4203.
[7] 邱蔚六,张震康.口腔颌面外科学[M].第5版. 北京:人民卫生出版社,2005:66-67.
[8] Ericson S, Kurol J. Incisor root resorptions due to ectopic maxillary canines imaged by computerized tomography: a comparative study in extracted teeth[J]. Angle Orthod, 2000, 70(4):276-283.
[9] Alamadi E, Alhazmi H, Hansen K, et al. A comparative study of cone beam computed tomography and conventional radiography in diagnosing the extent of root resorptions[J]. Prog Orthod, 2017, 18(1):37.
[10] Oenning AC, Melo SL, Groppo FC, et al. Mesial inclination of impacted third molars and its propensity to stimulate external root resorption in second molars-a cone-beam computed tomographic evaluation[J]. J Oral Maxillofac Surg, 2015, 73(3):379-386.
[11] Leone SA, Edenfield MJ, Cohen ME. Correlation of acute pericoronitis and the position of the mandibular third molar[J]. Oral Surg Oral Med Oral Pathol, 1986, 62(3):245-250.

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