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BackgroundPain is a major consequence of caries, which negatively impacts the quality of life of children and their families.AimTo analyse the parental report of dental pain and discomfort in preschool children, and to identify clinical and sociodemographic factors associated.DesignThis cross‐sectional study involved 375 four‐ and five‐year‐old preschoolers enrolled in the city of Campo Magro public school system, along with their parents and caregivers. Parents/caregivers answered the Brazilian version of the Dental Discomfort Questionnaire (DDQ‐B) and a sociodemographic questionnaire. Two examiners (kappa > 0.79) performed clinical examinations using dmf‐t and pufa index. The associations were statistically analysed by univariate and multiple Poisson regression with robust variance (α = 0.05).ResultsThe prevalence of dental pain and discomfort was 70.3% (66%‐75% 95% CI). Children from non‐nuclear families (PRa 1.33; 95% CI: 1.01‐1.76) and whose parents presented a lower level of education (PRa 2.43; 95% CI 1.66‐3.55) presented a higher prevalence of dental pain or discomfort. Considering the clinical determinants, after adjusting, only the presence of clinical consequences of untreated dental caries (pufa ≥ 1) (PRa 1.37; 95% CI 1.02‐1.84) was significantly associated with higher dental pain or discomfort.ConclusionsDental pain and discomfort were associated with socioeconomic factors and with the presence of clinical consequences of untreated dental caries.

This cross-sectional study aimed to assess the prevalence of molar incisor hypomineralization (MIH) and its relationship with the number of primary teeth with developmental defects of enamel (DDE). A representative population-based sample of 731 schoolchildren was randomly selected from the public school system in Curitiba, Brazil. Schoolchildren aged 8 years with fully erupted permanent first molars and incisors were eligible for the study. MIH and DDE were classified by four calibrated examiners (kappa > 0.75) according to EAPD criteria and to the FDI-modified DDE index. Clinical data were collected in a school environment. Socioeconomic information was collected through a self-administered semistructured questionnaire applied to the children's caregivers. Statistical analyses were carried out using Poisson multiple regression with robust variance (α = 0.05). MIH prevalence was 12.1% (95%CI: 10-15), and opacities were the most prevalent defect. Socioeconomic factors were not associated with MIH. Children with demarcated opacity in primary teeth presented a higher prevalence of MIH than those without DDE in primary teeth. In the multiple analysis, the increase of one primary tooth affected by demarcated opacity increased the prevalence of MIH by 33% (PR = 1.33, 95%CI: 1.15-1.53, p < 0.001). Asian children had a higher prevalence of MIH (PR = 2.91, 95%CI: 1.08-8.09 p = 0.035) than did Caucasian children. Conclusion: Based on these findings, the prevalence of MIH in Curitiba was 12.1%. Demarcated opacity in primary teeth could be considered a predictor of MIH.

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