检验无病的

Methods 1000 children first permanent molar normal eruptively were surveyed the extent of initial demineralization on the caries saitivity position by laser-fluorescence system KaVo DIAGNOdent,and chosen 60 no- demineralized children and 60 initial-demineralized or caries-susceptible children,Data were collected by questionnaire from their parents and analyzed by logistic regression and x2 test on computer.

采用激光荧光测定仪对1000名第一恒磨牙均已正常萌出的儿童进行龋敏感点位脱矿程度检查，随机抽取釉质无脱矿组和釉质脱矿组或龋病损组，60份有效配对问卷，进行x2检验及Logistic回归分析。

In the United States, chronic alcoholism and hepatitis C are the most common ones.

在美国，慢性酒精中毒，肝炎是最常见的。

If you have any questions, you can contact me anytime.

如果有任何问题，你可以随时联系我。