固定矫治中牙面变形链球菌附着状况及结扎材料对其影响的研究

Changes of Streptococcus mutans concentration of plaque during fixed appliance treatment

目的研究托槽粘接前后牙面变链菌的附着状况及结扎材料对变链菌附着的影响。方法随机在28例患者牙弓一侧用不锈钢丝结扎,另一侧用弹力圈结扎。于粘接前和粘接后1、3、7、11、15、19周进行变链菌和总厌氧菌培养。比较同种结扎材料粘接前后和同一时间点不同结扎材料间变链菌计数和百分比的差异。结果粘接后两种结扎材料侧变链菌计数和百分比均增加,与粘接前差异有统计学意义(P<0.01)。弹力圈结扎侧粘接后1周、3周的变链菌百分比(1.83%、1.87%)分别高于不锈钢丝结扎侧(1.78%、1.82%),差异有统计学意义(P<0.01,P<0.05)。结论托槽粘接后个体患龋概率增高。在矫治中推荐使用不锈钢结扎丝结扎。

Objective To evaluate the dynamic changes of Streptococcus mutans concentration of plaque during fixed appliance treatment and the effects of two materials of ligation on Streptococcus mutans concentration. Methods Twenty-eight patients undergoing fixed appliance treatment were observed. Ligature wire and elastomeric rings were applied on one side of arches, stochastically. The dynamic changes on the quantity and percentage of Streptococcus mutans were observed before and after fixed appliance bonding. Results Statistically significant increase of the quantity and percentage of Streptococcus mutans was found after fixed appliance bonding, and the percentage of Streptococcus mutans in the plaque around the brackets ligated with elastomeric rings was more than that of ligature wire at the beginning of fixed appliance bonding, statistically. Condusions The finding suggested that the caries-associated capability of the plaque increased after bonding and there was greater caries-associated capability of the plague on the teeth when elastomeric rings was used than that of the plague when ligature wire was used at treatment beginning. The ligature wire is recommended in the fixed appliance treatment.