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A STUDY OF BONE RESORPTION AT THE POSTERIOR BORDER OF DISTAL SEGMENT AFTER BILATERAL SAGITTAL SPLIT RAMUS OSTEOTOMY OF MANIBULAR PROGNATHIC PATIENTS  

Lee, Yong-In (Department of Oral and Maxillofacial Surgery, Samsung Medical Center, Sungkyunkwan University School of Medicine)
Lim, Jong-Hwan (Department of Oral and Maxillofacial Surgery, Samsung Medical Center, Sungkyunkwan University School of Medicine)
Noh, Kwang-Seob (Department of Oral and Maxillofacial Surgery, Samsung Medical Center, Sungkyunkwan University School of Medicine)
Hong, Jong-Rak (Department of Oral and Maxillofacial Surgery, Samsung Medical Center, Sungkyunkwan University School of Medicine)
Jun, Ju-Hong (Kangnam Samsung Dental Clinic)
Kim, Chang-Soo (Department of Oral and Maxillofacial Surgery, Samsung Medical Center, Sungkyunkwan University School of Medicine)
Publication Information
Journal of the Korean Association of Oral and Maxillofacial Surgeons / v.31, no.1, 2005 , pp. 55-59 More about this Journal
Abstract
Purpose : This study is to predict the changes of the distal segment by investing the resorption of the excessive distal segment regarding the amount of setback after BSSRO. Material and Methods : 20 patients with Mandible prognathism treated by Obwegeser-Dal Pont method during the years 2000 to 2002 were selected for this study. Group A consisted of 5 males & 5 females with a setback amount of 10mm and above(Mean $10.80mm{\pm}1.03$, n=20) and Group B consisted of 2 males & 8 females with a setback amount of below 10mm.(Mean $6.10mm{\pm}1.10$, n=20) Panorama X-ray was taken at day 1, 1month, 3months, 6months, and 12months after the surgery. Resorption areas of excessive distal segment were measured on these panorama X-rays and compared. Results : There was bone resorption in both groups. Group A showed more bone resorption than Group B. Group B showed slightly higher resorption rate than Group A. However, there was no statistically significant difference between the resorption rates of Group A and Group B. (P>0.05). Conclusion : More bone resorption occurred with a larger amount of setback and about one third of the excessive distal segment underwent resorption, irrespective of the amount of setback.
Keywords
Mandibular prognathism; Mandibular setback; Sagittal split ramus osteotomy; Distal segment; Bone resorption;
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