Cho Shiu-Yin, Ki Yung, Chu Vanessa
School Dental Care Service, Department of Health, Hong Kong.
Int J Paediatr Dent. 2008 Sep;18(5):348-52. doi: 10.1111/j.1365-263X.2008.00927.x. Epub 2008 Jul 10.
Most prevalence studies on molar incisor hypomineralization (MIH) were carried out in European countries, and data from the East-Asian populations were lacking.
This study aimed to investigate the prevalence of MIH in Hong Kong Chinese children.
Since 2006, charting of teeth with MIH was included into the routine dental examination in a school dental clinic. The dental records of grade 6 primary school children who attended annual check-up in this clinic in 2006 were subsequently reviewed retrospectively. The records were selected for this study if the charting indicated that the children were affected by MIH.
A total of 2635 records were reviewed and 73 cases of MIH were identified. The prevalence of MIH in this group of children was 2.8%. Their mean age was 12, and the male-to-female ratio was 1 : 1.2. The mean decayed, missing, or filled permanent teeth value of those affected was 1.5, which was higher than that of the general Hong Kong Chinese children aged 12 years old (0.8). A total of 192 teeth were affected. The most commonly affected teeth were permanent maxillary first molars, followed by mandibular first molars and maxillary central incisors. Dental fillings and fissure sealants were found in 52 (38%) and 65 (47%) permanent first molars with hypomineralization, respectively. Medical histories were unremarkable in 60 children, whereas early childhood diseases were reported in 13 cases.
The prevalence of MIH in the permanent dentition of Hong Kong Chinese children was 2.8%. Children with MIH showed higher caries experience in the permanent dentition than the general population of similar age.
大多数关于磨牙切牙矿化不全（MIH）的患病率研究是在欧洲国家进行的，缺乏东亚人群的数据。
本研究旨在调查香港中国儿童中MIH的患病率。
自2006年起，患有MIH的牙齿记录被纳入学校牙科诊所的常规牙科检查。随后对2006年在该诊所进行年度检查的六年级小学生的牙科记录进行回顾性审查。如果记录表明儿童受MIH影响，则选择这些记录进行本研究。
共审查了2635份记录，确定了73例MIH病例。这群儿童中MIH的患病率为2.8%。他们的平均年龄为12岁，男女比例为1:1.2。受影响儿童的恒牙龋失补牙面均值为1.5，高于香港12岁中国儿童的总体水平（0.8）。共有192颗牙齿受到影响。最常受影响的牙齿是上颌第一恒磨牙，其次是下颌第一恒磨牙和上颌中切牙。在52颗（38%）矿化不全的第一恒磨牙和65颗（47%）中分别发现了补牙和窝沟封闭。60名儿童的病史无异常，13例报告有幼儿疾病。
香港中国儿童恒牙列中MIH的患病率为2.8%。患有MIH的儿童恒牙列中的龋病经历高于同龄普通人群。
