Stomatology ›› 2023, Vol. 43 ›› Issue (6): 534-539.doi: 10.13591/j.cnki.kqyx.2023.06.010

• Clinical Research • Previous Articles     Next Articles

Automated detection of mandibular third molar root contacting with inferior alveolar canal on panoramic radiographs using a lite one-stage deep learning model

WANG Zhifan1,2,3,DAI Xiubin4,ZHOU Yanqi4,MAO Tianyi4,HUANG Hong1,2,3,SONG Hongcheng1,2,3,WANG Dongmiao1,2,3()   

  1. Department of Oral and Maxillofacial Surgery, The Affiliated Stomatological Hospital of Nanjing Medical University, Nanjing 210029, China
  • Revised:2023-03-13 Online:2023-06-28 Published:2023-07-06

Abstract:

Objective To develop a lite one-step deep learning network to detect the topographic proximity of the mandibular third molar(MTM)root to the inferior alveolar canal(IAC)on panoramic radiographs. Methods The samples, which consisted of 1 570 patients with 2 543 MTMs on paired panoramic radiographs and cone-beam computed tomography(CBCT), were randomly divided into the training group (80%), the validation group (10%), and the test group (10%). The evaluation of CBCT was defined as the ground truth. An extension of YOLO(You only look once)network, named as IAC-MTMnet, was trained to detect the proximity of MTM root to IAC on panoramic radiographs. Diagnostic performance analysis used accuracy, sensitivity, specificity, and positive predict value(PPV), and the area under the curve(AUC)was calculated based on the receiver operating characteristic(ROC)curve. Results On CBCT images, direct contact between MTM and IAC was observed on 798(31.38%)sides. The IAC-MTMnet achieved an accuracy of 0.885, a sensitivity of 0.747, a specificity of 0.956, and a PPV of 0.899. The AUC value achieved 0.95 and the test time was 0.059 s. Conclusion IAC-MTMnet is developed as a novel, robust and accurate method for detecting the proximity of MTM/IAC on panoramic radiographs.

Key words: mandibular third molar, inferior alveolar canal, panoramic radiography, CBCT, deep learning

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