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The International Journal of Adult Orthodontics & Orthogathic Surgery
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Publication:
International Journal of Adult Orthodontics and Orthognathic Surgery

Year 1994
Volume 9 , Issue 4

Back
Pages: 257 - 272

A comparison of wire osteosynthesis and screw fixation in the stability of bimaxillary osteotomies

Ayoub/Stirrups/Moos

This study compared stability of rigid and nonrigid fixation in patients who underwent simultaneous sagittal split mandibular advancement and Le Fort I Maxillary impaction. Immediately postoperative, 6-month, and 1-year follow-up cephalograms were used in the assessment. Slight inferior sett ling of the posterior end of the maxilla was detected in the nonrigid fixation group, but the maxilla generally stayed wihin 1 mm of its immediately postsurgical position in both groups. At the 6-mont h follow-up, the rigid fixation group averaged 2.5 degrees of clockwise mandibular rotation without any change in the gonial angle. In the nonrigid fixation group, the distal segment had rotated in a clockwise direction with an increase in the gonial angle of 3.0 degrees. No further changes were detected in the rigid fixation group, whereas the mandible con tinued its clockwise rotation in the nonrigid fixation group. These results support the belief that rigid fixation is more stable than wire osteosynthesis. The merits of assessing cephalograms with finite element and Euclidean distance matrix analyses to evalute surgical changes and stability are discussed.

 

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