“…Regarding the instruments, five articles used a single questionnaire [ 27 , 29 , 30 , 36 , 37 ], while eleven employed multiple questionnaires, with the most extensive one using six [ 38 ]. The most commonly referred instruments were the Epworth Sleepiness Scale (nine studies) [ 27 , 28 , 31 , 34 , 35 , 37 , 38 , 39 , 40 , 41 ], SF-36 (four studies) [ 32 , 38 , 39 , 42 ], Functional Outcomes of Sleep (three studies) [ 31 , 39 , 41 ], Ottawa Sleep Apnea (two studies) [ 36 , 39 ], and Rustemever’s method (two studies) [ 32 , 33 ]. The most evaluated outcomes were sleep quality, daytime function, facial aesthetics, dental function and emotional health.…”