ArticleEuropean archives of paediatric dentistry : official journal of the European Academy of Paediatric Dentistry2026
Clinical significance of residual yellow-brown enamel opacities in severe molar incisor hypomineralisation: a cross-sectional study.
Article in European archives of paediatric dentistry : official journal of the European Academy of Paediatric Dentistry, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
objectiveTo assess the prevalence of molar incisor hypomineralisation (MIH) and investigate whether residual yellow-brown enamel opacities coexisting on the same tooth surface as clinically advanced MIH lesions are associated with severe clinical outcomes, including post-eruptive breakdown, atypical restorations, and atypical caries lesions.
methodsThis cross-sectional study examined 680 schoolchildren aged 6 to 10 years from Bauru, Brazil, for MIH. Two trained and calibrated examiners performed the assessments using a modified version of the extended MIH index (MIH_e), which allows the simultaneous recording of multiple clinical features on the same tooth surface. Examinations were conducted under artificial lighting using school chairs, a mouth mirror, and a WHO probe. Descriptive statistics were used to report MIH prevalence and characteristics. Chi-square tests evaluated the association between the colour of residual demarcated opacities and the presence of post-eruptive breakdown, atypical restorations, and atypical caries lesions. The statistical significance level was 5%.
resultsMIH was detected in 24.8% of the participants. The most frequently observed feature was yellow-brown demarcated opacity (45.5%), followed by white-creamy opacity (35.1%), post-eruptive breakdown (9.2%), atypical restorations (5.9%), and atypical caries lesions (5.3%). A statistically significant association (p < 0.05) was found between the colour of opacities and the presence of severe clinical outcomes, with yellow-brown opacities more commonly associated with them.
conclusionMIH prevalence in Bauru was high (24.7%). Yellow-brown residual opacities were statistically significantly associated with clinical severity, reinforcing their usefulness as indicators of more advanced MIH.
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