Molar Incisor Hypomineralisation
Molar Incisor Hypomineralisation (MIH)/Molar Hypomineralisation (MH)
MIH is characterised by hypomineralised lesions on first permanent molars (FPMs) and incisors. If only FPMs are involved then the term MH is used. The hypomineralised lesions usually manifest as yellowish demarcated opacities on the affected teeth (Fig. 25.1). Prevalence in Europe is reported to be 6–14%.
Children usually present with:
- demarcated opacities on molars and/or incisors (Fig. 25.2);
- posteruptive enamel loss (Fig. 25.3);
- atypical restorations on FPMs (Fig. 25.4);
- extraction of first permanent molars.
It is important to differentiate MIH from other conditions manifest as hypomineralised disorders of enamel such as amelogenesis imperfecta (AI).
The aetiology is not completely understood so sometimes the term “idiopathic opacities” is still used. Most children with MIH presented with potential medical aetiological factors during the prenata/>