tailieunhanh - báo cáo khoa học:"The hierarchy of stability and predictability in orthognathic surgery with rigid fixation: an update and extension"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành y học dành cho các bạn tham khảo đề tài: The hierarchy of stability and predictability in orthognathic surgery with rigid fixation: an update and extension | Head Face Medicine BioMed Central Research The hierarchy of stability and predictability in orthognathic surgery with rigid fixation an update and extension William R Proffit Timothy A Turvey and Ceib Phillips Open Access Address Departments of Orthodontics and Oral and Maxillofacial Surgery School of Dentistry University of North Carolina Chapel Hill NC 27599-7450 USA Email William R Proffit - William_Proffit@ Timothy ATurvey - Tim_Turvey@ Ceib Phillips - Ceib_Phillips@ Corresponding author Published 30 April 2007 Head Face Medicine 2007 3 21 doi 1746-160X-3-21 Received 27 March 2007 Accepted 30 April 2007 This article is available from http content 3 1 21 2007 Proffit et al licensee BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License http licenses by which permits unrestricted use distribution and reproduction in any medium provided the original work is properly cited. Abstract A hierarchy of stability exists among the types of surgical movements that are possible with orthognathic surgery. This report updates the hierarchy focusing on comparison of the stability of procedures when rigid fixation is used. Two procedures not previously placed in the hierarchy now are included correction of asymmetry is stable with rigid fixation and repositioning of the chin also is very stable. During the first post-surgical year surgical movements in patients treated for Class II long face problems tend to be more stable than those treated for Class III problems. Clinically relevant changes more than 2 mm occur in a surprisingly large percentage of orthognathic surgery patients from one to five years post-treatment after surgical healing is complete. During the first post-surgical year patients treated for Class II long face problems are more stable than those treated for Class III problems from one to .