Longitudinal Study Of Predominant Bacrerias On Denture-bearing Areas Relating To Removable Partial Dentures

Longitudinal Study of Predominant Bacrerias on Denture-bearing Areas Relating to Removable Partial DenturesObjective: To study plaques on the palate mucosal before and after insertion removable partial dentures and to find out their changes along with time and in numbers, and in turn to explore the difference between such changes caused by acrylic resin bases and metal bases respectively. Methods: Ten patients who were first time to receive removable partial dentures were random collected and divided into two groups. Five patients used acrylic resin bases while the others used metal bases. Then at the following four points:before dentures were inserted, one month after wearing , three months after wearing and six months after wearing. The amounts of predominant cultural bacterias such as Streptococcus, Lactobacillus, Actinomyces, Neisseria, Candida albicans and Staplylococcus aureus were counted respectively. Result:The cultural bacterias were increased after wearing removable partial dentures no matter what type of bases was selected. The amounts of Streptococcus and Neisseria increased significantly after wearing dentures three months and six monthsamong five patients who used acrylic resin bases. Compare with one month Lactobacillus increased significantly after six months. As for five patients used metal bases, the number of cultural Neisseria increased significantly after insertion dentures three months, and Lactobacillus showed the same result after six months compare with before insertion and after insertion one month. There was no difference of the total amount of predominant cultural bacterias between acrylic resin bases and metal bases. Conclusion: The insertion of removable partial dentures was in favor of bacterias to accumulate. Base material has little effect on bacterias adherence.