Molar incisor hypomineralization is a developmental defect of dental enamel associated with rapid caries progression. In order to discover whether molar incisor hypomineralization predisposes to dental caries, a cross-sectional cohort study was conducted in a sample of 414 children aged between eight and nine years. It was found that 24.2% of the children presented molar incisor hypomineralization. Of these, 72% had a mild form and 28% a severe form. Caries prevalence was greater among the children with severe form (60.7%) than in those with mild form (43.1%) or no molar incisor hypomineralization (45.5%). The caries indices were higher in out molar incisor hypomineralization (1.18) or with mild form (1.08). The tooth-surface caries ratio was significantly higher in surfaces with severe hypomineralization than in those with no hypomineralization or mild hypomineralization. A linear regression model showed that cariogenic food intake and the presence of severe molar incisor hypomineralization were significantly associated with DMFS. Consequently, an association was found to exist between dental caries and the presence of surfaces affected by severe molar incisor hypomineralization, which should be considered a risk factor within the multifactorial etiology of caries.

中文翻译：

---

磨牙门牙低矿化的严重程度及其与龋齿的关系。

磨牙门牙矿化作用不足是与快速龋齿发展相关的牙釉质的发育缺陷。为了发现磨牙门牙矿化不足是否易引起龋齿，对414名8至9岁的儿童进行了横断面队列研究。结果发现，24.2％的儿童出现磨牙切牙低矿物质化。其中72％为轻度形式，28％为重度形式。重度患儿（60.7％）的患龋率高于轻度患儿（43.1％）或无磨牙切牙低矿化的患儿（45.5％）。龋齿指数在磨牙门牙低矿化度（1.18）或轻度（1.08）时较高。严重矿化程度低的牙齿表面的龋齿比明显高于没有矿化程度或轻度矿化程度的牙齿。线性回归模型表明，龋齿食物的摄入和严重的磨牙切牙矿化不足与DMFS显着相关。因此，发现龋齿与受严重磨牙门齿矿物质不足影响的表面之间存在关联，应将其视为龋齿多病因学中的危险因素。