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Objective <p>To 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.</p> Methods <p>This cross-sectional study examined 680 schoolchildren aged 6 to 10&#xa0;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%.</p> Results <p>MIH 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 (<i>p</i> &lt; 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.</p> Conclusion <p>MIH 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.</p>

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Clinical significance of residual yellow–brown enamel opacities in severe molar incisor hypomineralisation: a cross-sectional study

  • 期刊论文

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  • 发表日期：

    2026年3月5日

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  • F. L. Mendonça,
  • I. C. Grizzo,
  • D. D. S. Martins,
  • B. L. Polo,
  • A. M. Ferreira,
  • D. Rios

摘要

Objective

To 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.

Methods

This 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%.

Results

MIH 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.

Conclusion

MIH 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.