الفهرس 
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Abstract
This work was cofIducted to study the effect of telescopic and bar retained overdentures on the supporting oral structures. For this purpose, twenty patients were selected and divided into two groups. Each patient had an edentulous upper jaw, and a canine and a molar on each side of the lower jaw. For the first group a telescopic overdenture,that was placed over metallic copings, was constructed while for the second group an overdenture retained by a laboratory made bar unit was constructed.
These two types of overdenture were studied by eval— uating their effects on the gingiva, periodontal ligament, and the edentulous segments of the ridge. The gingiva was studied by the gingival index, while the periodontium was studied by the pocket depth, loss of fiber attachment, and the bonelevel of the abutments. The edentulous segments of the ridge were studied by lateral cephalometric radio- graphs. All these tests were repeated after one year to evaluate the changes of the oral structures included in this study.
The results of this study for both groups showed a significant increase in the gingival index, pocket depth, and loss of fiber attachment, and a significant decrease
J in the marginal bone level of the abutments. No significant difference was found for the edentulous segments between the initial measurements and those taken one year later.