Department of Paediatric Dentistry, School of Dentistry, Aristotle University of Thessaloniki, Thessaloniki, Greece.
Eur Arch Paediatr Dent. 2021 Apr;22(2):241-246. doi: 10.1007/s40368-020-00543-9. Epub 2020 Jun 10.
The purpose of this study was to investigate defect distribution and morphology in hypomineralised second primary molars (HSPM), presence of similar defects in other primary teeth and clinical similarities with molar-incisor hypomineralisation (MIH).
This clinical descriptive study involved children who attended a postgraduate paediatric dental clinic in a 20-month period and were diagnosed with HSPM. The updated MIH/HSPM index of Ghanim et al. (Eur Arch Paediatr Dent 16(3):235-46, 2015) was used to record defects on primary molars and canines.
54 children (23 boys) aged 4 to 12 years comprised the study sample. The mean number of affected second primary molars per child was 2.65 with no statistically significant difference between maxilla and mandible or between right and left side with defects more frequently located on buccal surfaces. 66.7% of the children were mildly affected (opacities only) with 29 out of 54 having defects occupying less than 1/3 of the surface. Severity increased with increasing number of affected teeth and extent of the defects per child. Similar defects were recorded in the first primary molars and canines in 55.5% of the children who had those teeth present.
The distribution and morphology pattern of HSPM defects was similar to that in MIH, supporting the notion of a common hypomineralisation entity.
本研究旨在探讨低矿化第二恒磨牙（HSPM）的缺陷分布和形态，以及在其他乳牙中是否存在类似缺陷，并与磨牙-切牙低矿化症（MIH）进行临床比较。
本临床描述性研究纳入了在 20 个月期间就诊于研究生儿科牙科诊所并被诊断为 HSPM 的儿童。采用 Ghanim 等人更新的 MIH/HSPM 指数（Eur Arch Paediatr Dent 16(3):235-46, 2015）记录乳牙和恒前磨牙的缺陷。
研究样本包括 54 名儿童（23 名男孩），年龄在 4 至 12 岁之间。每个孩子受影响的第二恒磨牙的平均数量为 2.65，上颌和下颌之间或左右两侧之间无统计学差异，缺陷更频繁地位于颊面。66.7%的儿童受轻度影响（仅出现不透明），54 名儿童中有 29 名缺陷占据表面不到 1/3。随着受影响牙齿数量和每个孩子缺陷程度的增加，严重程度也随之增加。在存在这些牙齿的儿童中，55.5%记录到第一恒磨牙和恒前磨牙存在类似的缺陷。
HSPM 缺陷的分布和形态模式与 MIH 相似，支持低矿化是一种共同实体的概念。
