[Prevalence of oral mucosal alterations in Brazilian adolescents held in two juvenile re-education centers]. / Prevalência de alterações da mucosa bucal em adolescentes brasileiros institucionalizados em dois centros de reeducação.

The purpose of the present study was to verify the prevalence of oral mucosal alterations in Brazilian adolescents institutionalized. A total of 231 adolescents, all male were examined. The criteria used for clinical diagnostic of the lesions were the former proposed by SB 2000 (Brazil). The total oral mucosal lesions prevalence was 27.70% (64 lesions). The total prevalence of buccal mucosal lesions were 27.70% (64 lesions) in 24,24% of the adolescents. The most frequent one was plaque. It was found 293 mucosal alterations. 78.35% of the adolescents examined presented at least one alteration. The melanin pigmentation was the most common alteration. The data collected had been analyzed statistically through Kruskall Wallis non-parametric test and associations through Qui-Square test, considering significant level of 5%. Statistical significant difference was identified concerning between basic lesions and/or mucosal alterations and race (p=0,002) and skin colours and average number of the mucosal alteration (p=0,000) and the present of the melanin pigmentation and leukoedema and race (p=0,000 and p=0,002). There wasn't any statistically significant difference between average number of the mucosal lesions and race (p=0,618).