Department of Orthodontics, University of São Paulo City, Universidade Cidade de São Paulo, São Paulo, Brazil.
Am J Orthod Dentofacial Orthop. 2010 Jan;137(1):54-8. doi: 10.1016/j.ajodo.2007.12.033.
This cross-sectional retrospective epidemiologic study assessed the relationship between exclusive breastfeeding duration and the prevalence of posterior crossbite in the deciduous dentition.
Clinical examinations were performed in 1377 Brazilian children (690 boys, 687 girls), 3 to 6 years old, from 11 public schools in São Paulo, Brazil. Based on questionnaires answered by the parents, the children were classified into 4 groups according to the duration of exclusive breastfeeding: G1, never (119 subjects); G2, less than 6 months (720 subjects); G3, 6 to 12 months (312 subjects); and G4, more than 12 months (226 subjects). The statistical analyses included the chi-square test (P <0.05) and the odds ratio.
The posterior crossbite was observed in 31.1%, 22.4%, 8.3%, and 2.2% of the children, in groups G1, G2, G3, and G4, respectively. The results showed a statistically significant relationship between exclusive breastfeeding duration and the prevalence of posterior crossbite.
Children who were breastfed for more than 12 months had a 20-fold lower risk for the development of posterior crossbite compared with children who were never breastfed and a 5-fold lower risk compared with those breastfed between 6 and 12 months.
本横断面回顾性流行病学研究评估了纯母乳喂养持续时间与乳牙期后牙反牙合患病率之间的关系。
在巴西圣保罗的 11 所公立学校对 1377 名 3 至 6 岁的巴西儿童（690 名男孩，687 名女孩）进行了临床检查。根据家长回答的问卷，将儿童分为 4 组，根据纯母乳喂养的持续时间：G1 组，从不（119 例）；G2 组，少于 6 个月（720 例）；G3 组，6 至 12 个月（312 例）；G4 组，超过 12 个月（226 例）。统计分析包括卡方检验（P<0.05）和比值比。
在后牙反牙合的儿童中，分别在 G1、G2、G3 和 G4 组中观察到 31.1%、22.4%、8.3%和 2.2%。结果表明，纯母乳喂养持续时间与后牙反牙合的患病率之间存在统计学显著关系。
与从未母乳喂养的儿童相比，母乳喂养 12 个月以上的儿童发生后牙反牙合的风险降低 20 倍，与母乳喂养 6 至 12 个月的儿童相比，风险降低 5 倍。
