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Master Thesis

Histologie des hypominéralisations de premières molaires permanentes (MIH)

Abstract : MIH is an enamel defect whose etiological factors are still poorly known. The objectives of our histological study are to characterize the hypomineralisations according to their severity, but also to highlight the neonatal line and to see the relationship of this line with the MIH lesions. We selected 1 group of 5 first permanent molars with white lesions, 1 group of 5 first permanent molars with yellow lesions, 1 group of 5 first permanent molars with brown lesions, and 1 group of 3 temporary second molars with MIH. Following a histological observation, we were able to objectify an increasing size of the lesions according to the severity of the defect; we could highlight the presence of a layer of healthy surface enamel and preserved cervical enamel. The neonatal line was observed on 4 of 15 permanent molars, most frequently on the mesiovestibular cusps. It was observable on all temporary molars. Our observations are consistent with those found in the literature: the color of the lesion correlates with the degree of severity. The enamel anomaly seems to appear a few weeks before birth, until the 6th/7th month of life. Moreover, the surface enamel observed, explains the limits of our erosion-infiltration therapies. The neonatal line is inconsistent on the first permanent molars, but has provided us with informations on the date of appearance of this lesion.
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https://dumas.ccsd.cnrs.fr/dumas-03451544
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Submitted on : Friday, November 26, 2021 - 3:06:13 PM
Last modification on : Wednesday, December 1, 2021 - 3:48:17 AM

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  • HAL Id : dumas-03451544, version 1

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Simon Courtade-Vignettes. Histologie des hypominéralisations de premières molaires permanentes (MIH). Sciences du Vivant [q-bio]. 2021. ⟨dumas-03451544⟩

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