Developmental hypomineralization of the enamel of the first permanent and the second deciduous molars - report of two cases

Abstract

Introduction. Molar-incisor hypomineralisation (MIH) is a developmental defect of dental enamel that affects one to all four first permanent molars (FPM) and frequently permanent incisors. Enamel aberrations are observed as demarcated opacities of different colours (from white to brown) and as posteruptive enamel breakdown (PEB). Clinically similar pathological signs can also be present in deciduous molars. Case outline. Histology of an FPM and a second deciduous molar (SDM) was performed after extraction from two unrelated patients with MIH due to inflammatory complications. Tooth samples were analysed using a stereomicroscope (SM), light microscope (LM) and scanning electron microscope (SEM). Enamel thickness of both affected teeth was normal. An obvious distinction in enamel microstructure was observed between the normally developed and the MIH-hypomineralised enamel with SM, LM, and SEM. Conclusion. In MIH patients, regular dental visits enable early diagnosis of the disease and appropriate treatment of the patient as soon as possible, with included preventive measures.

Timing of clinical eruption of permanent teeth in children with molar incisor hypomineralization

“…In the present study, the permanent first molars and permanent incisors of children aged 6 to 12 were examined for the presence of MIH. Halogen reflector lighting, a mirror, and a probe were used in the dental unit in accordance with the criteria established by Ghanim et al The patients with only affected incisors were not diagnosed with MIH because these defects can be caused by local factors, such as trauma and caries [6,7]. For the patients who lacked the teeth under examination because of extraction, the presence or absence of demarcated opacities in the other teeth was ascertained.…”