الفهرس 
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Abstract
Twenty patients exhibiting mandibular bilateral distal extension edentulous area (Kennedy class I) and completely edentulous maxillary arch were selected to participate in this study. from the outpatient clinic of Prosthodontic Department, Faculty of Dentistry, Ain Shams University.
The selected patients were free from any systemic diseases that affects bone resorption, temporomandibular joint disorders and with no history of para-functional habits.
Patients were subjected to thorough examination to detect any abnormalities in ridge, mucosa or temporomandibular joint and for each patient; a diagnostic panoramic radiograph was made. All patients were rehabilitated with upper complete dentures and lower chrome cobalt partial dentures following the conventional technique.
After the step of jaw relation, patients were randomly divided into two equal groups according to the type of material of the artificial teeth used in denture construction into:
group I: Ten patients were rehabilitated with mucosa supported complete denture and tooth-tissue supported chrome cobalt partial denture retained by RPI direct retainer having composite artificial teeth.
group II: Ten patients were rehabilitated with mucosa supported complete denture and tooth-tissue supported mandibular chrome cobalt partial denture retained by RPI direct retainer having cross linked acrylic artificial teeth.
Teeth were taken from the same company with the same sizes and occlusal forms as both types were processed from the same mold.
• A duplicate of the diagnostic casts was used for construction of the diagnostic radiographic stents.
• Panoramic radiograph was taken for the patients preoperatively while the patient was wearing the radiographic stent.
• All patients were rehabilitated with mucosa supported upper complete denture and lower tooth-tissue supported chrome cobalt partial denture. Upper and lower primary impressions were made using alginate impression material.
• The required mouth preparations were carried out as was drawn on the lower study cast.
• Secondary impression was taken for the lower arch using rubber base and for the upper arch border molding was done using green stick compound and the secondary impression was made using zinc oxide- Eugenol impression material. Altered cast impression was taken for the lower arch.
• Upper and lower occlusion blocks were constructed. In both groups, setting up of teeth was done following the lingualized concept of occlusion.
• The trial denture bases are checked intra-orally.
Patients were recalled frequently for post-insertion inspection and adjustments. Follow-up visits were scheduled for measuring the changes in the marginal bone height distal to the abutment and at the free end saddle at time of denture insertion, 3 and 6 months for inspection of the prosthesis
and collection of the data. Radiographic evaluation using cone beam computed tomography was followed.
The results were collected, tabulated and statistically analyzed.
The results showed that bone loss distal to the abutment and at the free end saddle in group I was lower than group II, and it was of statistical significance.