Characteristics of bony changes and tooth displacement in the mandibular cystic lesion involving the impacted third molar
이진혁, 김성민, 김학진, 전국진, 박광호, 허종기,
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이진혁 ( Lee Jin-Hyeok ) - Yonsei University College of Dentistry Gangnam Severance Dental Hospital Department of Oral and Maxillofacial Surgery
김성민 ( Kim Sung-Min ) - Yonsei University College of Dentistry Gangnam Severance Dental Hospital Department of Oral and Maxillofacial Surgery
김학진 ( Kim Hak-Jin ) - Yonsei University College of Dentistry Yongin Severance Hospital Department of Oral and Maxillofacial Surgery
전국진 ( Jeon Kug-Jin ) - Yonsei University College of Dentistry Yongin Severance Hospital Department of Oral and Maxillofacial Radiology
박광호 ( Park Kwang-Ho ) - Yonsei University College of Dentistry Gangnam Severance Dental Hospital Department of Oral and Maxillofacial Surgery
허종기 ( Huh Jong-Ki ) - Yonsei University College of Dentistry Gangnam Severance Dental Hospital Department of Oral and Maxillofacial Surgery
KMID : 0355620140400050225
Abstract
Objectives: The purpose of this retrospective study is to find the differentiating characteristics of cystic and cystic-appearing lesions that involve the impacted mandibular third molar by analyzing panoramic radiographs and computed tomography images, and to aid the preoperative diagnosis.
Materials and Methods: Eighty-one patients who had a mandibular cystic or cystic-appearing lesion that involved impacted mandibular third molar and underwent cyst enucleation were included in the study. The preoperative panoramic radiograph and computed tomography findings were analyzed in accordance to the histopathologic type.
Results: Most of the cystic lesions containing the mandibular third molar were diagnosed as a dentigerous cyst (77.8%). The occurrence of mesio-distal displacement of the third molar was more frequent in the odontogenic keratocyst (71.4%) and in the ameloblastoma (85.7%) than in the dentigerous cyst (19.1%). Downward displacement was primarily observed in each group. Odontogenic keratocyst and ameloblastoma showed more aggressive growth pattern with higher rate of bony discontinuity and cortical bone expansion than in dentigerous cyst.
Conclusion: When evaluating mandibular cystic lesions involving the impacted mandibular third molar, dentigerous cyst should first be suspected. However, when the third molar displacement and cortical bone absorption are observed, then odontogenic keratocyst or ameloblastoma should be considered.
키워드
Third molar; Dentigerous cyst; Odontogenic cysts; Ameloblastoma; Mandible
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