effect of two designs of overdenture on bone density of mandibular alveolar supporting structures using computed tomography

This study evaluated the effect of the design of overdenture on the bone mineral content of the mandibular alveolar bone around the remaining abutment teeth. Six female subjects who made two groups were selected, each received maxillary complete denture opposed by mandibular overdenture. Conventional designs of overdenture were used for the first group, metal dowels, copings for the remaining canines and for the second group cast dowels and copings with tissue bar in between were utilized for the mandibular overdenture. Measurements of bone density were performed at two sites of each canine [mid-root and apex] using computed tomography immediately after insertion of overdentures and 6 months later. The comparison of each site between the first measurement and the 6 months later measurement revealed increase in bone density value, but not statistically significant. Comparison of the mean of each group [representing all sites together] before and after 6-month period showed no statistical significance in the bone density for conventional design group at both sites and a statistical significant increase in bone density for the tissue-bar design group at both sites. Quantitative computed tomography seemed to be a reliable and adaptable technique for bone density measurement which can help in predicting the rate of change in the alveolar bone

use of wax alginate system in making impression for removable partial denture

The purpose of this study was to use the periphery wax which is very easy to apply inside the rest seat areas in the patient's mouth then to make an overall impression of alginate in a stock tray. Upon removal of the impression, the wax in the test seats will be incorporated in the alginate impression. This method was expected to eliminate the problems associated with the conventional technique. In addition, it appears to be less time consuming and less expensive as well