Observation of trabecular changes of the mandible after orthognathic surgery using fractal analysis
강현주, Jeong Song-Wha, Jo Bong-Hye, 김용덕, 김성식,
소속 상세정보
강현주 ( Kang Hyeon-Ju ) - Pusan National University School of Dentistry Department of Orthodontics
( Jeong Song-Wha ) - Pusan National University School of Dentistry Department of Oral and Maxillofacial Radiology
( Jo Bong-Hye ) - Pusan National University School of Dentistry Department of Oral and Maxillofacial Radiology
김용덕 ( Kim Yong-Deok ) - Pusan National University School of Dentistry Department of Oral and Maxillofacial Surgery
김성식 ( Kim Seong-Sik ) - Pusan National University School of Dentistry Department of Orthodontics
KMID : 0355620120380020096
Abstract
Objectives: This study sought to evaluate trabecular changes in the mandible using fractal analysis and to explain the transient osteopenia related to rapid orthodontic tooth movement after orthognathic surgery. Materials and Methods: Panoramic radiographs were taken of 26 patients who underwent bilateral sagittal split ramus osteotomy. Radiographs taken before the surgery and 1 month after surgery were overlapped, and 40×40 pixel square regions of interest were selected near the mandibular canines and 1st molars. After the image processing procedure, the fractal dimension was calculated using the box-counting method. Results: Fractal dimension after orthognathic surgery decreased in a statistically significant manner (P <0.05). The change in fractal dimension on the canine side had greater statistical significance as compared to that seen on the 1st molar side. Conclusion: This study found that bone density decreases after orthognathic surgery due to transient osteopenia related to the regional acceleratory phenomenon. This result can provide a guide to evaluating orthodontic tooth movement after orthognathic surgery.
키워드
Tooth movement; Orthognathic surgery; Metabolic bone diseases; Regional acceleratory phenomenon; Fractals
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