| Objective: This study was designed to find out the changes in subgingival plaque on abutment teeth of the diabetics after wearing of removable partial dentures, and in turn to explore the difference of such changes caused by diabetic oral condition, which can provides biomechanics basis for diabetics' prosthodontic theraphy.Methods: Sixteen patients who were ready to accept removable partial dentures were selected and divided into 2 groups .One group was diabetics the other was non-diabetics.Then at the fllowing four points: before dentures were inserted ,one week,one month and three months after wearing . the total cultivable flora were counted and the percentages of the G~-bacteria in the gingival sulcus of the abutment teeth were calculated. At the same time recorded the patients' periodontal index.Result:1. Compared to pre-restoration,the accumulation of microlora has conspicuous difference in non-diabetics after 1 week, 1 month and 3months.2. Compared to pre-restoration,the accumulation of microlora has no conspicuous difference in diabetics after 1 week;however,they have maked difference after 1 month and 3months. 3. No matter what kind of patients was selected , the percentages of G~-bacteria detected in gingival sulcus both increased significantly (P<0.05) .4. When such changes were compared , we found that the increament of accumuliton of microflora and G~-bacteria in diabetics were higher than that in non-diabetics (P<0.05).Conclusion: The wearing of the removable partial dentures enhanced the accumulation of microflora in abutment gingival sulcus. Compared with such changes between diabetics and non-diabetics, the changes related to diabetic oral conditions are more evident.
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