Changes in the Duration of the Chewing Cycle in Patients With Skeletal Class III With and Without Asymmetry Before and After Orthognathic Surgery

Ueki, Koichiro; Marukawa, Kohei; Hashiba, Yukari; Nakagawa, Kiyomasa; Degerliyurt, Kagan; Yamamoto, Etsuhide

doi:10.1016/j.joms.2008.06.018

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Volume 67, Issue 1 , Pages 67-72, January 2009

Changes in the Duration of the Chewing Cycle in Patients With Skeletal Class III With and Without Asymmetry Before and After Orthognathic Surgery

Koichiro Ueki, DDS, PhD
- Assistant Professor, Department of Oral and Maxillofacial Surgery, Graduate School of Medicine, Kanazawa University, Kanazawa, Japan
- Address correspondence and reprint requests to Dr Ueki: Department of Oral and Maxillofacial Surgery, Graduate School of Medicine, Kanazawa University, 13-1 Takaramachi, Kanazawa 920-8641, Japan
Kohei Marukawa, DDS, PhD
- Clinical Instructor, Department of Oral and Maxillofacial Surgery, Graduate School of Medicine, Kanazawa University, Kanazawa, Japan
Yukari Hashiba, DDS
- Graduate Student, Department of Oral and Maxillofacial Surgery, Graduate School of Medicine, Kanazawa University, Kanazawa, Japan
Kiyomasa Nakagawa, DDS, PhD
- Associate Professor, Department of Oral and Maxillofacial Surgery, Graduate School of Medicine, Kanazawa University, Kanazawa, Japan
Kagan Degerliyurt, DDS
- Research Fellow, Department of Oral and Maxillofacial Surgery, Graduate School of Medicine, Kanazawa University, Kanazawa, Japan
Etsuhide Yamamoto, DDS, PhD
- Professor and Head, Department of Oral and Maxillofacial Surgery, Graduate School of Medicine, Kanazawa University, Kanazawa, Japan

Purpose

The purpose of this study was to examine the changes in the chewing rhythm before and after mandibular ramus osteotomy in patients with prognathism with and without asymmetry.

Patients and Methods

We divided 12 men and 22 women with mandibular prognathism into groups on the basis of symmetry and osteotomy procedure. The duration of the chewing cycle was recorded preoperatively and postoperatively. The duration of the chewing cycle and coefficient of variation were compared between groups, and the differences were analyzed statistically.

Results

No significant differences in each of 3 phases of the chewing cycle and total duration were found between groups on the basis of symmetry or osteotomy procedure. However, there were significant differences between the preoperative and postoperative coefficients of variation for the undeviated side in the asymmetry group (P = .0037) and in the group undergoing sagittal split ramus osteotomy (P = .0166).