engleski

The assessment of alveolar bone density arround the abutment teeth

Alveolar bone density changes during the life span. Abutment teeth and the bone around them carry additional load from the lost teeth. The clasp transfer occlusal forces from them to abutment teeth and their periodontal structures. These can load to increased and decreased alveolar bone density depending on the direction of the forces. Aims: The aim of this study is to assess the influence of patial dentures (PD) frequency usage onto alveolar bone density arround abutment teeth in patients that carrie the PD 24 h/day and ones that have a periods of rest. The data was analysed and compared. Methods: 50 patients of both genders carriers of PD were X-rayed twice in period of 3 month for standard retroalveolar radiograph. For calibration on each radiographs copper wedges of different thickness (0, 1-0, 5mm) were used. The radiographs were digitized and the gray levels translated into copper wedges thickness equivalents on 21 regions of interest (ROI) according the Knezović- Zlatarić method. The same ROI were positioned arround abutment teeth on the alveolar bone in both radiographs and the difference were analysed by one way variance test. Results: In the analysed sample 62% of the patients carried the PD 24 h/day, 26% carried PD during the day and 12% only occasionally. There was no statistical difference in the alveolar bone density (p› 0, 05). Conclusions: The correct planing and axial direction of the transfered forces on abutment teeth, periodontal ligament and alveolar bone did not disraped the phisiolgical balance of bone aposition and resorption resulting in mainted alveolar bone density in the analysed period regardless of the frequency of usage.

BONE DENSITY; ABUTMENT TEETH

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