Stomatology ›› 2023, Vol. 43 ›› Issue (1): 70-74.doi: 10.13591/j.cnki.kqyx.2023.01.012

• Clinical Research • Previous Articles     Next Articles

Comparison of panoramic radiography and cone-beam computed tomography images for detecting external root resorption of mandibular second molar associated with third molar impaction

SONG Hongcheng1,2,3,HUANG Hong1,2,3,WANG Zhifan1,2,3,JING Qiuping1,2,3,WANG Dongmiao1,2,3()   

  1. Department of Oral and Maxillofacial Surgery, the Affiliated Stomatological Hospital of Nanjing Medical University, Nanjing 210029, China
  • Revised:2022-08-19 Online:2023-01-28 Published:2023-01-11
  • Contact: WANG Dongmiao E-mail:wdm9921@njmu.edu.cn

Abstract: Objective To compare the diagnostic performance between panoramic radiography(PR)and cone beam computed tomography(CBCT)in the assessment of external root resorption(ERR)of mandibular second molars associated with impacted third molars. Methods A total number of 832 patients with 1 074 mesially and horizontally impacted mandibular third molars treated at our institution from January 2019 to December 2020 were retrospectively analyzed. Presence of ERR on the adjacent second molar was investigated with PR and CBCT. Factors affecting the diagnostic accuracy of PR were determined. Results The overall incidence of ERR in second molars was 33.15%(356/1 074)as detected by CBCT images. The accuracy of PR was 66.39%. Multivariate Logistic regression analyses further revealed that middle and Class Ⅲ impaction, crown contact or overlap with the root of adjacent tooth were risk factors for inaccurate diagnosis of PR(P<0.05). Conclusion The accuracy of detection on ERR of mandibular second molar associated with impacted third molar using panoramic radiography is lower. CBCT is recommended for this clinical scenario.

Key words: impacted mandibular third molar, mandibular second molar, external root resorption, panoramic radiography, CBCT

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