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目的    研究孕期及产后妇女饭后咀嚼木糖醇口香糖的防龋效果。方法    随机选取2007年5月在石家庄市第一医院体检的孕期或产后妇女［龋、失、补牙面数（DMFS）≥8］96名。经龋齿基线检查后,随机分为木糖醇组、氟化泡沫组、对照组3组。2年后复查龋患情况。结果    木糖醇组、氟化泡沫组、对照组3组新增龋面均分别为1.28、1.32、2.35,木糖醇组、氟化泡沫组与对照组比较,新增龋面均差异具有统计学意义（P < 0.01）。木糖醇组、氟化泡沫组与对照组比较,新增龋面均降低率分别为43.11%、41.33%。结论    在良好的口腔保健条件下,木糖醇口香糖与氟化泡沫有同等的防龋效果。

A clinical study on Xylitol in dental caries prevention

Objective To assess the preventive effects of Xylitol on dental caries in pregnant and new mothers who chew Xylitol gum. Methods A total of 96 pregnant and new mothers （DMFT≥8） who aged 25 -35 were checked in my hospitol. They were divided into three groups. Group A： Xylitol; Group B： fluoride foam; Group C： the negnative control group.Oral biologic examinations were perfomed at line and after two years. Results New caries of A, B and C were 1.28,1.32 and 2.35. There was no difference in new caries between group A and group B （P ≥ 0.05）. Group A and B, compared to group C, the new caries were significantly different（P 〈 0.01 ）. The decrease rate of new caires was 43.11% and 41.33 in group A and B, compared with group C. Conclusion Both Xylitol and fluoride foam can prevent caries. Xylitol has the same preventive effect as fluoride foam.