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Skeletal Relapse After Mandibular Setback in Bi Max Surgery: Intraoral Vertical Ramus versus Bilateral Sagittal Split
Ra'ed M A Al-Delayme1, Moutaz Al-Khen2
1Oral and Maxillofacial Surgery Department, Faculty of Dentistry, Al-Rafidain University College, Baghdad, Iraq ; Oral and Maxillofacial Surgery Department, AL-Yarmuk Teaching Hospital, Baghdad, Iraq.
Objectives:
This study aimed to measure and compare the postoperative horizontal and vertical changes (relapse) that occur at B point and pogonion after intraoral vertical ramus osteotomy (IVRO) without fixation and bilateral sagittal split osteotomy (BSSO) with semi rigid internal fixation in bimax surgery.
Materials And Methods:
Eleven patients with skeletal class III malocclusion mandibular prognathism and maxillary hypoplasia were chosen. Six cases underwent BSSO; and five IVRO. All patients underwent Lefort I osteotomy without genioplasty.
Result:
Postoperative changes (relapse) of B-point and pogonion in horizontal and vertical axes from 1 week post operatively (T0) to 1 year post operatively (T2) were assessed and the percentage of relapse of each point and each axis was compared. It was noted that the horizontal relapse in IVRO was 27.7 % at B point and 40.6 % at pogonion while, in BSSO group it was noted that the horizontal relapse was 28.1 % at B point and a greater number i.e., 40.9 % at pogonion.
Conclusion:
The percentage of horizontal relapse after IVRO without fixation is equal to that after BSSO with semi rigid internal fixation.
