*Patrícia Bittencourt Santos. DDS, MSc, PhD-Assistant Professor, Department of Orthodontics and Paediatric Dentistry, State University of Rio Grande do Norte, Caicó, Brazil.
**Eloisa Cesario Fernandes, Graduate Student. Dental School. State University of Rio Grande do Norte, Caicó, Brazil.
J Clin Pediatr Dent. 2022 Mar 1;46(2):143-147. doi: 10.17796/1053-4625-46.2.9.
To investigate the association between molar-incisor hypomineralization (MIH) and enamel hypoplasia.
The sample consisted of 311 orthodontic files of patients aged between 12 and 18 years, divided into two groups: patients with MIH (109) and without MIH (202). MIH and enamel hypoplasia were diagnosed via panoramic radiographs and intraoral photographs, followed by clinical examination of the MIH-affected patients as per the modified EAPD scoring criteria. Chi-square test and t test were used to assess intergroup comparisons regarding sex, age and race. Fisher's Exact test was used to compare the groups regarding the presence of enamel hypoplasia and the Adjusted Odds Ratios (OR) were calculated.
There was an association between MIH and enamel hypoplasia. The prevalence of enamel hypoplasia (5.5%) was significantly higher in patients with MIH compared to the control group (0.49%). MIH lesions increase 12.45-fold the risk of having enamel hypoplasia.
Patients with MIH have a higher prevalence of enamel hypoplasia and these defects seem to share the same etiological factor.
探讨磨牙牙釉质发育不全（MIH）与釉质发育不全的关系。
该样本由 311 名 12 至 18 岁正畸患者的档案组成，分为两组：MIH 患者（109 例）和非 MIH 患者（202 例）。通过全景片和口腔内照片诊断 MIH 和釉质发育不全，然后根据改良 EAPD 评分标准对 MIH 受累患者进行临床检查。采用卡方检验和 t 检验比较两组间性别、年龄和种族的差异。采用 Fisher 确切检验比较两组釉质发育不全的存在情况，并计算调整后的优势比（OR）。
MIH 与釉质发育不全之间存在关联。与对照组（0.49%）相比，MIH 患者釉质发育不全（5.5%）的患病率明显更高。MIH 病变使发生釉质发育不全的风险增加 12.45 倍。
MIH 患者釉质发育不全的患病率较高，这些缺陷似乎具有相同的病因。
