S-Space College of Engineering/Engineering Practice School (공과대학/대학원) Dept. of Industrial Engineering (산업공학과) Journal Papers (저널논문_산업공학과)
A three-dimensional analysis of soft and hard tissue changes after a mandibular setback surgery
- Kim, Nam-Kug; Lee, Cheol; Kang, Suk-Ho; Park, Jae-Woo; Kim, Myung-Jin; Chang, Young-Il
- Issue Date
- Computer Methods and Programs in Biomedicine 83 (2006) 178-187
- 3D soft tissue changes; 3D coordinate system; 3D cephalometry; Surgery estimation; Cephalometry based registration
- This paper is concerned with a three-dimensional (3D) analysis on soft and hard tissue
changes after mandibular setback surgery. For comparing with previous two-dimensional
(2D) cephalometric data,we proposed a three-dimensional registration and analysis method
based on the cephalometric knowledge. The 3D changes of bone, soft tissue and the ratio of
soft tissue to bony movement were investigated in eight skeletal class III mandibular prognathism
patients. CT scans of each patient were taken at pre- and post-operative states.
Each scan was registered to a universal 3D coordinate system defined by cephalometric
landmarks. A grid, parallel to the coronal plane,was also designed for the comparison of the
changes. The bone and soft tissue was intersected by the projected line from each point on
the grid. The coordinate values of intersected point were measured and compared between
the pre- and post-operative models. In addition, the reproducibility of the universal coordinate
system and the grid was evaluated. The facial surface changes after setback surgery
occurred not only in the mandible but also in the mouth corner region. The soft tissue
changes of the mandible were measured relatively by the proportional ratios to the bone
changes. The ratios at the mid-sagittal plane were 77–102% (p < 0.05). The ratios at all other
sagittal planes had similar patterns to the mid-sagittal plane with decreased values. All the
results conformed to the previous 2D based clinical knowledge and instinct of orthodontists.
It is expected that the proposed approachwould be applicable to other oral and maxillofacial
surgeries as well as plastic surgeries.
- Files in This Item: There are no files associated with this item.