弯制卡环与铸造卡环对龈下微生物的影响

目的了解卡环戴入前后基牙龈下微生物变化,考察弯制卡环与铸造卡环对龈下微生物影响的差异.方法检查戴牙前、戴牙后1周、1月和3月,弯制卡环和铸造卡环所在基牙龈下可培养细菌总量及革兰氏阴性菌构成比的变化.结果与戴牙前相比,戴牙后1周、1月和3月龈下可培养细菌总量及革兰氏阴性菌构成比均明显增加,差异有统计学意义(P＜0.05),戴牙后1月,弯制卡环与铸造卡环所在基牙龈下革兰氏阴性菌构成比有统计学差异(P＜0.05).结论在本文观察期(3个月)内,卡环的戴入造成龈下微生物中革兰氏阴性菌构成比显著增加,弯制卡环与铸造卡环对龈下微生物中革兰氏阴性菌构成比的影响没有显著差异.

The influence of wrought wire clasps and casting clasps on gingival sulcus microflora

Objective To investigate the changes in microecology in gingival sulcus of abutment teeth after wearing clasps and the difference in influence of wrought wire clasps and casting clasps on sulcus flora. Methods Ten patients who were ready to accept removable partial denture were selected and divided into 2 groups. One group used wrought wire clasps and the other used casting clasps. Then at the following four time points: before denture was installed, one week, one month and three months after wearing the clasps, the total cultivable flora were counted and the percentages of the G-bacteria in the gingival sulcus of the abutment teeth were calculated. Results The wearing of both types of clasps promoted the accumulation of microflora in abutment gingival sulcus. The percentage of G-bacteria detected in gingival sulcus increased significantly (P<0.05). The increasement of G-bacteria caused by wrought wire clasps was higher than that caused by casting clasps one month after wearing. However, the increasement of G- bacteria three months after installation between wrought wire clasps and casting clasps was not different. Conclusion The wearing of the removable partial denture enhanced the accumulation of G- bacteria in gingival sulcus of abutment teeth.