变异链球菌对不同材料活动义齿牙冠黏附的研究

目的 分析口腔常见条件致龋菌变异链球菌在不同材料活动义齿牙冠上的黏附情况,为临床选择活动义齿牙冠材料以尽可能减少变异链球菌在义齿牙冠上黏附,从而避免佩戴义齿后对口腔环境的二次影响提供参考.方法 3种材料(单层色合成树脂牙、多层色合成树脂、合金钉瓷牙)活动义齿牙冠在无菌处理过的人唾液样本环境下进行24 h黏附,取出牙冠后超声强震荡并10倍梯度稀释后涂板计数,分析3种材料牙冠细菌的黏附量.结果 3种材料的活动义齿牙冠表面均有变异链球菌的黏附,其中单层色合成树脂牙黏附最多,其次为合金钉瓷牙,而多层色合成树脂牙黏附细菌量远远低于另外两种(P＜0.01).结论 3种材料的活动义齿,以多层色合成树脂牙表面黏附的变异链球菌数量最少,变异链球菌在该材料上的黏附能力显著低于单层色合成树脂牙和合金钉瓷牙.

Adhesion of Streptococcus Mutans to Removable Denture Crowns

Objective To determine adhesion of Streptococcus mutans (S.mutans ) to different kinds of removable denture crowns for the purpose of minimizing influence of removable denture on oral environment. Methods Three kinds of removable denture crowns (single color synthetic resin teeth, alloy pin porcelain tooth and minute color synthetic resin teeth) were adsorbed S.mutans for 24 h in sterile saliva, The adhered bacteria were counted by means of sonic oscillation and bacteria coating. Results Highest level of adhesion was found on the single color synthetic resin teeth was adsorbed mostly, followed by alloy pin porcelain teeth. Minute color synthetic resin teeth had far less adhesion than the others (P <0.01). Conclusion Minute color synthetic resin teeth have less adhesion of S.mutans, which may be associated with their lower level of surface free energy.