الفهرس 
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Abstract
This study was conducted to evaluate the clinical, radiographic anc cytological changes in the supporting structures of the denture bearin areas to the two types of denture bases (acrylic denture bases, and acrylic dentures lined with thermoplastic resilient liner).
For this purpose, twenty male patients were selected with edentulous upper and lower jaws.
The patients were divided equally into two main groups:
For Group (A) (control Group), complete upper and lower acrylic dentures were constructed.
For Group (B) (test Group), complete acrylic upper and lower dentures lined by thermoplastic resilient liner were constructed.
Clinical and cytological evaluation of the alveolar mucosa wa performed periodically before denture insertion, six and twelve months after denture insertion, to study the changes in the alveolar mucosa in boti groups.
Radiographic evaluation was done before denture insertion, six anc twelve months later to measure the amount of resorption of the residua ridge, and the changes in the bone density in both groups.