Combination of Mandibular Constriction and Intraoral Vertical Ramus Osteotomies for a Transverse Jaw Discrepancy.
BACKGROUND
The aim of the present study was to evaluate the treatment of patients developing a transverse jaw width discrepancy who exhibited class III malocclusion and/or facial asymmetry by a combination of mandibular constriction (MC) and intraoral vertical ramus osteotomies (IVROs).


METHODS
In a retrospective study, functional results, postoperative complications, and skeletal stability were analyzed for all the patients who had undergone MC and IVRO, with more than 2 years of follow-up. A mandibular midline osteotomy for constriction with lag screw technique and IVROs was used for MC and setback.


RESULTS
Sixteen patients were included in the present study. The average degree of MC was 6.34 mm. Both the occlusal relationship and facial appearance in all patients were significantly improved by the surgical orthodontic treatment, with no harmful clinical symptoms. In addition, our original MC using lag screw technique provided the most reliable results in terms of skeletal stability.


CONCLUSIONS
This study showed that MC using lag screw technique gives a very stable mandibular width constriction, and the combination of MC and IVROs offers a promising treatment alternative for patients with mandibular prognathism developing a transverse jaw width discrepancy.
Department of Oral and Maxillofacial Surgery, Kochi Health Sciences Center, Kochi, Japan; Takamatsu Oral and Maxillofacial Surgery Clinic, Takamatsu, Kagawa, Japan; and Hirose orthodontic office, Kochi, Japan.
Shingo
S
Hara
Department of Oral and Maxillofacial Surgery, Kochi Health Sciences Center, Kochi, Japan; Takamatsu Oral and Maxillofacial Surgery Clinic, Takamatsu, Kagawa, Japan; and Hirose orthodontic office, Kochi, Japan.
Masaharu
M
Mitsugi
Department of Oral and Maxillofacial Surgery, Kochi Health Sciences Center, Kochi, Japan; Takamatsu Oral and Maxillofacial Surgery Clinic, Takamatsu, Kagawa, Japan; and Hirose orthodontic office, Kochi, Japan.
Hisamitsu
H
Hirose
Department of Oral and Maxillofacial Surgery, Kochi Health Sciences Center, Kochi, Japan; Takamatsu Oral and Maxillofacial Surgery Clinic, Takamatsu, Kagawa, Japan; and Hirose orthodontic office, Kochi, Japan.
Yukihiro
Y
Tatemoto