Aim: To evaluate the prevalence of sleep bruxism in childrenbetween 2 to 6 years old in primary dentition in a public school(A1) and a private school (A2) in the state of Piauí. Method: Itwas cross-sectional and quantitative study in 370 participants,180 in A1 and 190 in A2. The questionnaire to help diagnosebruxism was applied to parents. In the clinical examination,dental wear was evaluated, checking for the presence ofshiny and polished facets on deciduous incisors and / ormolars (palatal surface, incisal edges and working cusps)and the results were noted in the odontogram. Students whohad bruxism participated in group 1 (G1) and those who didnot have it were in the control group (CG) in both A1 and A2.Results: One hundred and five children had sleep bruxism.Tooth wear was more prevalent in the male gender. Both in A1and in A2 and in both genders, wear on primary molars wasmore frequent than in canines. Conclusion: The prevalence ofbruxism in children between 2 and 6 years of age was 28.3%,with a predominance in males. There was an associationbetween sleep bruxism and the habit of sucking a finger,pacifier, bottle use and the habit of awake bruxism. In 98.09%of the children who had sleep bruxism, teeth pain was found.
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