First Permanent Molars and Permanent Incisors Teeth by Tooth Prevalence of Molar–Incisor–Hypomineralisation in a Group of Spanish Schoolchildren

Abstract

BackgroundMolar-incisor-hypomineralisation (MIH) is a disturbance in dental development that commonly involves first permanent molars but permanent incisors may also be compromised. The prevalence of MIH in the literature varies between 2.5% and 40% of the world child population. Little information is gained on the prevalence of MIH among children in Spain.AimThe aim of this study was to investigate the prevalence of MIH among school children from Barcelona, Spain.Material and methodsA cross-sectional study which included 705 children, aged 6 -14 years and 11 months was carried out. Full mouth examinations were performed using the European Academy of Paediatric Dentistry (EAPD) criteria for the diagnosis of MIH.ResultsA total of 56 cases of MIH were found, 22 (39.3%) boys and 34 (60.7%) girls. The prevalence was 7.94% (6.39% for boys and 9.41% for girls). MIH lesions were seen more often in girls than boys (χ2 = 4.9, p= 0.023) the male/female ratio being 1:1.54. Upper teeth were more prevalent than lower teeth in both genders with an upper/lower ratio of 1.86/1 for boys and 1.68/1 for girls.ConclusionConsidered either by gender or by teeth, upper teeth and girls were ahead in our sample.

Perception, Knowledge and Attitudes Towards Molar Incisor Hypomineralization Among Spanish Dentists: A Cross-sectional Study.

“…There are a limited number of studies on the prevalence of MIH in Spain in which the prevalence varies from 7. 94% 9 , to 11.1% 10 , 17.8% 11 and 21.8% 12 .…”

Perception, knowledge, and attitudes towards molar incisor hypomineralization among Spanish dentists: a cross-sectional study

“…The global recorded prevalence of MIH ranges from 2.4 to 40% and differs between countries [ 7 , 8 ]. There are a limited number of studies on the prevalence of MIH in Spain, where the prevalence varies from 7.94% [ 9 ] to 11.1% [ 10 ], 17.8% [ 11 ] and 21.8% [ 12 ].…”

Microbiology of molar–incisor hypomineralization lesions. A pilot study

“…In order to unravel the origin of these differences, we grouped Hypo samples according to several characteristics of the patients, i.e. atopic dermatitis, food allergies or asthma [10]; if they were treated with fluoride or the number of teeth affected. Only when samples were classified in two groups depending on the number of hypomineralized teeth (<3 [Low] or 4-8 hypomineralized teeth [High]), the clustering was significant (p-value = 0.04) (Figure 4(a)).…”

“…Generally, MIH develops during the first 3 years of life when the mineralization process of the crowns of the first permanent molars (FPM) and permanent incisors (PI) takes place [10,11]. Its prevalence depends mainly on the country examined (2.8% to 44% have been suggested [12]).…”

“…It is believed that the origin of the problem is an alteration in the resorption capacity of the organic matrix and the inhibition of the proteolytic enzymes. In consequence, proteins would be accumulated, reducing the space to deposit the minerals [10] which would result in a porous enamel [17]. In fact, MIH-affected enamel shows from 3 to 21-fold higher protein content and lower hardness and elasticity than normal teeth [18].…”