الفهرس 
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Abstract
This study is done to evaluate the effect of different torquing releasing clasp assemblies as a retainer units to the mandibular distal extension dentures, on the abutment alveolar bone height: radiographic evaluation. The clasp assemblies used are (RPI, RPA, RPL, modified clasp). The study results found that the less resorption of the abutment alveolar bone with the RPA, and modified clasp. Then the RPL clasp follow them in the amount of abutment alveolar bone resorption. The more abutment alveolar bone resorption was found with the RPA clasp assembly.
Find more likely that the twenty patients with upper jaw Aladerd lifting the bottom with a background Tsenama extension to study the effect of clamps designed to launch plucks Bmtkot snap as units designed for crews partial extension to change the background of high Aztm alveolar supporting surrounding teeth.
The patients were divided into four equal groups on the basis of the type of clamp used in this research as follows:
The first group used the clamp RPI.
The second group used a clip RPL.
Total third clip used RB A.
Group D used the clip rate.
Clinically equipped Canine and first premolar the best places to receive the appropriate metal structure was prepared for a partial kit to enable access to a print size and functional relationship was recorded between the jaws then been manufacturing dentures in its final form is received for each patient individually.
To measure the change in the height of the bones supporting the teeth Altsch around the peak X-ray taken in the case, and after six months and twelve months Use the Kroll Drew Alhessoblthdid the change in the bones supporting the teeth socket throughout the study periods.
from the above we can deduce the following:
1. Clamps designed to launch plucks Astaazia not be considered a solution to save the alveolar bone surrounding the teeth supporting cases of corrosion in the background of the extension.
2. If we take into account the jurisprudence of the clamps liberated Alazmip cases during the design of the rear extension possible to choose the rate and clamp buckle RBI to occur, they eat less in the alveolar bone around the teeth supporting.