engleski

The rate of resorption of different regions of residual ridges in complete denture wearers dependent on the region and the period following the last extraction. One year study.

Residual alveolar ridges (RR) show continual resorpiton after the loss of the natural dentition, resulting in reduction of the morphologic face height and counter clockwise rotation of the mandible, regardless of wether the dentures are worn or not. The aim of this study was to analyse residual rodge resorption (RRR) in 5 different regions of both jaws on the successive lateral cephalograms of 50 complete denture wearers and to correlate such changes with the number of years of edentia and the region where the last extraction was performed. The high of the residual ridges was measured on 5 different sites of the mandible and the maxillary RR using a calibrated grid. The results revealed that all the patients showed significant RRR in the one year period (p<0.01), which was 2.5x more in the mandible than in the maxilla. RRR was bigger in patients who had had their last extraction within a period of one year befor receiving their dentures, than in patients who had extracted their teeth earlier (p<0.01). However, the rate of RRR was significantly higher (p<0.01) in the anterior regions of both jawas compared to distal regions (0.41 and 0.42 mm in the incisive/canine region: 0.2 and 0.17 mm in the premolar/molar region for the maxilla 1.05 and 0.82 mm in the incisive/canine region: 0.27 and 0.11 in the premolar/molar region for the mandible), even in patientswhere the last extraction was performed in the premolar region. It seems that the structure of the bone and strains in RR, due to loading from the dentures, may play a role, not only the period following extraction and the region of the last extraction.

residual ridge resorption; mandibular regions

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