Korean J Orthod.  2008 Aug;38(4):252-264. 10.4041/kjod.2008.38.4.252.

Prediction of frontal soft tissue changes after mandibular surgery in facial asymmetry individuals

Affiliations
  • 1Department of Orthodontics, 2nd Stage of Brain Korea 21, School of Dentistry, Dental Science Research Institute, Chonnam National University, Korea. hhwang@chonnam.ac.kr
  • 2Department of Oral and Maxillofacial Surgery, School of Dentistry, University of Washington, Korea.
  • 3Korean Adult Occlusion Study Center, Korea.
  • 4Department of Orthodontics, School of Dentistry, Chonnam National University, Korea.

Abstract


OBJECTIVE
To aid the development of a frontal image simulating program, we evaluated the soft tissue frontal changes in relationship to movement of hard tissue with orthognathic surgery of facial asymmetry patients. METHODS: Preoperative and postoperative frontal cephalograms and frontal view photographs of 45 mandibular surgery patients with facial asymmetry were obtained in a standardized manner. Vertical and horizontal changes of hard tissue and soft tissue were measured from cephalograms and photographs, respectively. Soft tissue change in result to hard tissue change was then analyzed. RESULTS: Both vertical and horizontal correlation analysis showed a weak relationship between the changes. Hard tissue points that were picked for 1:1 mean ratio with soft tissue points did not show any significant relevance. For each soft tissue change, regressive equation was formulated by stepwise multiple regression analysis, and the equation for soft tissue Menton was most reliable in predicting changes. Both vertical and horizontal hard tissue changes were used together in prediction of vertical or horizontal soft tissue change. CONCLUSIONS: The results suggest that computerized image simulation using regression analysis may be of help for prediction of soft tissue change, while 1:1 mean ratio method is not useful.

Keyword

Prediction of soft tissue change; Frontal cephalogram; Frontal photo; Facial asymmetry; Image simulation

MeSH Terms

Facial Asymmetry
Humans
Orthognathic Surgery

Figure

  • Fig 1 Cephalometric landmarks to represent hard tissue change. Detailed description of landmarks is in Table 2.

  • Fig 2 Photometric landmarks to represent soft tissue change. Detailed description of landmarks is in Table 3.


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