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Aim: Removable partial dentures (RPDs) can influence the oral health and have the potential to cause further tooth loss, especially of abutment teeth. However, no evidence indicates the effective interval of regular periodontal maintenance after RPD provision. This study aimed to examine the impact of regular periodontal maintenance visits on survival of RPD abutment teeth. Materials and Methods: Patients were included if they had been provided with a clasp-retained RPD and had used it for 2 years or more. According to the frequency of periodontal maintenance, study samples were divided into three groups; every 3–6 months (3–6M) group, 1-year (1Y) group and no-maintenance (NM) group. Results: Five-year cumulative survival rates were 82.6% (3–6M), 74.4% (1Y) and 70.8% (NM) respectively. Survival of abutment teeth in the 3–6M group was significantly better than both 1Y and NM groups. Conclusion: The periodontal maintenance at least once in 6 months had the most favorable outcome. Frequent periodontal maintenance after RPD provision could be effective in preventing further tooth loss.

Introduction. Dental intrusion in patients whose support periodontium is deficient is a real and viable means for improving implantation, as the results of previous research are promising. Materials and methods. Catia V5R16 software and the attached Abaqus analysis software was used for investigating the behaviour of periodontal structures affected, to various extents, by periodontal disease. The mathematical models underwent repeated testings, using optimal (0.25 N) and super-optimal (1N, 2N, 3N and 5N) orthodontics forces, for assessing the response of the periodontal structures. Results and discussion. The values of σ ech show an exponential increase, as well as the magnitude of the applied force, irrespective of the presence of the periodontal disease (Fig. 8). The values of σ ech are the same for each level of applied force, whether the maxillary lateral incisor was affected or not. The values of the displacement recorded as a result of the application of intrusive forces on the maxillary lateral incisor, in cases when the periodontium was not affected or when it was affected to an extent of 33% by the periodontal disease, maintain a linear growth, along with the increase of the applied force, without any statistically significant differences as to the extent to which the periodontium was affected. Conclusions. The magnitude of the intrusive forces in the maxillary lateral incisor influences primarily the values of equivalent tensions, then those of orthodontic tooth movement, and lastly those of tensions in the direction of the applied force. [ABSTRACT FROM AUTHOR]