Polygraphic evaluation of the effects of functional orthodontic treatment with twin block and herbst appliances on sleep quality: a randomized clinical trial.

Researchers compared twin block and Herbst appliances for treating patients with a recessed lower jaw and sleep apnoea, measuring sleep quality and jaw position over 8 months. The Herbst appliance produced significant improvements in sleep apnoea measures, while both appliances improved jaw position and sleep quality ratings.

A plain-English summary of the study's own findings — we don't add our own claims or interpretation. Read the full paper for the complete methods and results, and apply your own clinical judgement.