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Assessment of bone density changes following two-jaw surgery using multidetector computed tomography: A pilot study

Korean Journal of Orthodontics 2020년 50권 3호 p.157 ~ 169
이영주 ( Lee Young-Joo ) - Wonkwang University School of Dentistry Department of Orthodontics

박재현 ( Park Jae-Hyun ) - A.T. Still University Arizona School of Dentistry & Oral Health Postgraduate Orthodontic Program
장나영 ( Chang Na-Young ) - Wonkwang University School of Dentistry Department of Orthodontics
 ( Lee Mi-Young ) - Seoul National University Gwanak Dental Hospital Department of Orthodontics
김봉철 ( Kim Bong-Chul ) - Wonkwang University Daejeon Dental Hospital Department of Oral and Maxillofacial Surgery
 ( Seo Hye-Young ) - Wonkwang University College of Natural Sciences School of Big Data and Financial Statistics
 ( Mangal Utkarsh ) - Yonsei University College of Dentistry Department of Orthodontics
채종문 ( Chae Jong-Moon ) - Wonkwang University School of Dentistry Department of Orthodontics

Abstract


Objective: The aim of this retrospective study was to evaluate the pre- and postsurgical bone densities at alveolar and extra-alveolar sites following two-jaw orthognathic surgery.

Methods: The sample consisted of 10 patients (mean age, 23.2 years; range, 18.0?27.8 years; 8 males, 2 females) who underwent two-jaw orthognathic surgery. A three-dimensional imaging program (Invivo 5) was used with multidetector computed tomography images taken pre- and postoperatively (obtained 32.3 ± 6.0 days before surgery and 5.8 ± 2.6 days after surgery, respectively) for the measurement of bone densities at the following sites: (1) alveolar bone in the maxilla and mandible, (2) extra-alveolar sites, such as the top of the head, menton (Me), condyle, and the fourth cervical vertebrae (C4).

Results: When pre- and postsurgical bone densities were compared, an overall tendency of decrease in bone density was noted. Statistically significant reductions were observed in the densities of cancellous bone at several areas of the maxillary alveolar bone; cortical and cancellous bone in most areas of the mandibular alveolar bone; cortical bone in Me; and cancellous bone in C4. There was no statistically significant difference in bone density in relation to the depth of the alveolar bone. In a comparison of the bone densities between groups with and without genioplasty, there was almost no statistically significant difference.

Conclusions: Accelerated tooth movement following orthognathic surgery may be confirmed with reduced bone density. In addition, this study could offer insights into bone metabolism changes following orthognathic surgery, providing direction for further investigations in this field.

키워드

Bone density; Orthognathic surgery; Multidetector computed tomography; Regional and systemic acceleratory phenomena
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