Objectives: The aim of this study was to examine the relationship
between morphologic factors of mandibular protrusion patients and
clinical indices of obstructive sleep apnea (OSA).
Methods: Fifty-two Japanese patients divided into 2 groups: 1 jaw
surgery group (30 patients) and 2 jaw surgery group (22 patients).
Morphologic changes were studied using cephalograms taken
before surgery and 1 year after surgery. Functional changes studied
using impulse oscillometry and pulse oximetry during sleep, both of
which are clinically useful measures in assessing OSA, taken before
surgery and 1 year after surgery.
Result: Lower face cage area significantly decreased in 1 jaw group
than in 2 jaw group patients. Positive significant correlation was
found between changes in 3% oxygen desaturation index (ODI) and
changes of tongue area and vertical position of the hyoid bone in 1
jaw surgery group. Multiple regression analysis indicates that tongue area and airway area were independently significant predictors
of 3% ODI in 1 jaw group patients.
Conclusion: In 2 jaw surgery, maxillary surgery compensated for
the effect of mandibular setback surgery. Mandibular setback
surgery to mandibular protrusion patients was performed within the
range of adequate movement distance, but precautions for risk of
postoperative obstructive sleep apnea syndrome should be considered.