Why most patients do not exhibit obstructive sleep apnea after mandibular setback surgery?

Area of Science:

• Oral and Maxillofacial Surgery
• Sleep Medicine
• Anesthesiology

Background:

• Maxillomandibular advancement (MMA) surgery is a recognized treatment for obstructive sleep apnea (OSA), improving airway dimensions.
• The impact of mandibular setback surgery on airway patency and its potential link to OSA development remains controversial.
• Previous research indicates mandibular setback may reduce airway volume, but a direct causal link to OSA is not definitively established.

Purpose of the Study:

• To investigate the controversial effects of mandibular setback surgery on airway dimensions and its potential association with obstructive sleep apnea.
• To explore the relationship between mandibular setback and the development of sleep apnea, considering existing literature and potential confounding factors.

Main Methods:

• Review of existing studies examining airway changes after maxillomandibular advancement and mandibular setback procedures.
• Analysis of case-controlled studies considering demographic variables (age, sex, BMI) and presurgical conditions related to OSA.
• Evaluation of potential differences in airway obstruction patterns between awake and sleep states in patients undergoing mandibular setback.

Main Results:

• While MMA increases airway space, mandibular setback's effect on airway volume and posterior airway space is debated.
• A direct causal relationship between mandibular setback and OSA development is not clearly established, with few reported postoperative cases.
• Differences in patient demographics and obstruction patterns may explain the controversy surrounding mandibular setback and OSA.

Conclusions:

• Preoperative evaluation and management of comorbidities are crucial for preventing OSA after mandibular setback surgery, despite its low incidence.
• Further research is needed to fully elucidate the complex relationship between mandibular setback surgery, airway dynamics, and obstructive sleep apnea.