The idea behind MSDO
MSDO stands for mandibular symphyseal distraction osteogenesis. It is a surgical approach to widening the lower jaw: the surgeon makes a controlled cut at the midline, then a distraction device gradually separates the segments so new bone can form between them.
The goal is to address a transverse discrepancy—the relationship between jaw width and the space available for the teeth. The device, amount of expansion and orthodontic sequence depend on the clinical assessment.
How it fits into Double Expansion
At Osteon, MSDO is part of the Double Expansion (SARPE+MSDO) package. SARPE addresses upper jaw expansion; MSDO addresses the lower jaw. Both are planned together with orthodontic care so that the upper and lower dental arches can be coordinated.
Beyond the short video
A 2018 systematic review found that the expansion pattern differed between distraction devices, with greater widening toward the front of the mandible. The included studies had a high risk of bias, and the authors called for better long-term research.
A short video is a starting point for understanding the procedure. It cannot establish who is a candidate or predict an individual result.
Further reading
Mandibular Midline Distraction Osteogenesis: a systematic review (2018)