Department of Pediatric Dentistry, São Paulo State University, Araraquara School of Dentistry, UNESP - Araraquara, São Paulo, Brazil.
Int J Paediatr Dent. 2010 Nov;20(6):426-34. doi: 10.1111/j.1365-263X.2010.01097.x. Epub 2010 Aug 24.
The prevalence of molar incisor hypomineralization (MIH) varies considerably around the world; however, few studies have examined MIH in South American countries.
To evaluate the prevalence, severity, and clinical consequences of MIH in Brazilian children residing in rural and urban areas of the municipality of Botelhos, Minas Gerais, Brazil.
Children aged 6 to 12 years (n = 918) with all four-first permanent molars erupted had these teeth evaluated according to the European Academy of Paediatric Dentistry (EAPD) criteria. The examinations were conducted by two previously trained examiners, and the dental impact caused by MIH was evaluated with the Decayed, Missing and Filled Teeth (DMFT) index (WHO).
Molar incisor hypomineralization was present in 19.8% of the 918 children, with a higher prevalence in rural areas. The majority of the defects presented were demarcated opacities without post-eruptive structural loss, which has been considered as mild defects. Children with MIH had higher DMFT values.
Despite the high prevalence of MIH, the severity of the defects was mild. The results indicate a positive association between MIH and the presence of dental caries.
磨牙牙釉质发育不全（MIH）的患病率在世界各地差异很大；然而，很少有研究检查过南美洲国家的 MIH。
评估巴西米纳斯吉拉斯州博泰洛斯市农村和城市地区儿童 MIH 的患病率、严重程度和临床后果。
对 918 名年龄在 6 至 12 岁（n = 918）且所有四颗第一恒磨牙均已萌出的儿童，根据欧洲儿童牙科学会（EAPD）标准对这些牙齿进行评估。检查由两名经过预先培训的检查者进行，并且使用龋失补（DMFT）指数（WHO）评估 MIH 对牙齿造成的影响。
918 名儿童中有 19.8%存在磨牙牙釉质发育不全，农村地区的患病率更高。大多数出现的缺陷是边界不清晰的不透明性，没有萌出后结构丧失，这被认为是轻度缺陷。患有 MIH 的儿童的 DMFT 值更高。
尽管 MIH 的患病率很高，但缺陷的严重程度较轻。结果表明 MIH 与龋齿的存在之间存在正相关关系。
