“…The RCTs evaluated the effects of MADs compared with placebo treatment [11,13,14,22,23,25,[28][29][30], CPAP [11, 13, 16-19, 24, 26, 32, 34] or between appliance designs [15,20,27,31,33,35,36,38]. Three studies reported longer-term results from MAD treatment after 1-4 yrs, compared with CPAP [12], surgery [37] or between two types of MAD [21].…”