Bilateral sagittal split osteotomies and mandibular distraction osteogenesis: a randomized controlled trial comparing skeletal stability
Received 2 February 2009; received in revised form 3 July 2009; accepted 17 July 2009. published online 29 October 2009.
Objective
To conduct a randomized controlled trial comparing the skeletal stability of bilateral sagittal split osteotomy (BSSO) and mandibular distraction ostoegenesis (MDO) for moderate mandibular advancement.
Study design
Fourteen class II mandibular hypoplasia patients requiring mandibular advancement between 6 and 10 mm were randomized into 2 groups for either BSSO or MDO. Serial lateral cephalographs were taken 2 weeks, 6 weeks, 12 weeks, 6 months, and 12 months after surgery for the assessment of skeletal stability. The Student t test was used to analyze stability with statistical significance set at P < .05.
Results
There was no significant difference (P > .05) in horizontal and vertical skeletal relapse between the 2 groups at every postoperative time period.
Conclusions
Although the MDO group reported less horizontal and vertical skeletal relapse for mandibular advancements between 6 and 10 mm at 1 year, no statistically significance was found between the groups. Other patient-related factors need to be considered when choosing one technique over the other.
aSenior Resident, Oral and Maxillofacial Surgery, Discipline of Oral and Maxillofacial Surgery, Faculty of Dentistry, Prince Philip Dental Hospital, University of Hong Kong, Hong Kong, China
bChair Professor, Oral and Maxillofacial Surgery, Discipline of Oral and Maxillofacial Surgery, Faculty of Dentistry, Prince Philip Dental Hospital, University of Hong Kong, Hong Kong, China
Reprint requests: Professor Lim K. Cheung, 2/F, Oral and Maxillofacial Surgery, Faculty of Dentistry, Prince Philip Dental Hospital, 34 Hospital Road, Hong Kong, China
ABSTRACT