Cephalometric prediction of risk factors for mandibular third molar impaction Lee WC, Yuh DY, Sung CE, Wu YC, Chen YW, Chen WL, - J Med Sci

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Cephalometric prediction of risk factors for mandibular third molar impaction Wei-Cheng Lee¹, Da-Yo Yuh², Cheng-En Sung², Yu-Chiao Wu³, Ying-Wu Chen², Wei-Liang Chen⁴ ¹ Department of Orthodontics, School of Dentistry, Tri-Service General Hospital, National Defense Medical Center, Taipei, Taiwan ² Department of Periodontology, School of Dentistry, Tri-Service General Hospital, National Defense Medical Center, Taipei, Taiwan ³ Department of Endodontics, School of Dentistry, Tri-Service General Hospital, National Defense Medical Center, Taipei, Taiwan ⁴ Division of Geriatric Medicine, Family and Community Health Center, Tri-Service General Hospital, National Defense Medical Center; School of Medicine, National Defense Medical Center, Taipei, Taiwan Correspondence Address: Wei-Liang Chen, Division of Geriatric Medicine, Family and Community Health Department, Tri-Service General Hospital, National Defense Medical Center, No. 325, Sec. 2, Chenggong Rd., Neihu Dist., Taipei 114 Taiwan Source of Support: None, Conflict of Interest: None DOI: 10.4103/jmedsci.jmedsci_20_23

Background: Mandibular third molar impaction in adult patients is one of the most common problems in dental practice. However, limited data are available on the association between mandibular third molar impaction and craniofacial skeletal problems. Aim: This study aimed to establish a prediction model to evaluate the risk factors for mandibular third molar impaction. Methods: Panoramic and lateral cephalometric radiographs of orthodontic patients aged ≥20 years were obtained from the Tri-Service General Hospital. The radiographs were analyzed by a single examiner. Panoramic radiographs were used to evaluate the mandibular third molar impaction. Lateral cephalometric radiographs were used to evaluate five linear and six angular measurements to define the facial pattern of the participants. The association between cephalometric measurements and mandibular third molar impaction was determined using one-way analysis of variance and logistic regression analysis. Results: This study included 60 participants. The incidence of mandibular third molar impaction was associated with the mandibular plane angle (MPA) and mandibular length (Co-Gn) (P < 0.001). The presence of mandibular third molar impaction was found to gradually increase with increasing MPA and decreasing mandibular length. Conclusion: Individuals with a greater MPA and lesser mandibular length had a higher incidence of mandibular third molar impaction.

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    -  Lee WC
    -  Yuh DY
    -  Sung CE
    -  Wu YC
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    -  Chen WL

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