الفهرس 
IntroductionOnly 14 pages are availabe for public view
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Abstract
Purpose: This in vitro study compared between different designs of solitary attachments used to retain implant assisted mandibular distal extension removable partial overdenture (IADERPOD) regarding stresses on abutment teeth.
Materials and Methods: A heat cure acrylic risen model of a mandibular Kennedy Class I was selected with remaining natural teeth from the first premolar on one side to first premolar on the other side was duplicated, and three removable partial denture were fabricated from a cobalt chromium metal framework and acrylic occlusal rims. Strain gauges were placed on the acrylic model at baccal, lingual and distal surfaces to measure the strain around abutment teeth. Two Dentaurum® implants were then placed in the first molar regions and the removable partial dentures were connected to implants using three different attachment namely ball, magnetic and locator attachments. The model was loaded by 50N unilaterally and bilaterally on first molar areas.
Results: Comparison of combined strain around abutment teeth (average strain of buccal, lingual and distal strain gauge positions) between groups during bilateral and unilateral (loading and non-loading sides) load application was made. There was a significant difference between groups during bilateral and unilateral loading application (Kruskal Wallis test, p=.00). Magnetic assisted RPOD demonstrated the highest strain, followed by locator assisted RPOD and the lowest strain was recorded with ball assisted RPOD. The highest strain was recorded at the lingual surface and the lowest strain was recorded at the distal surface of abutment teeth.
Conclusion: In spite of using implants and attachments for assisting distal extension RPD, the abutment teeth still subjected to a considerable stress under loading. Ball attachment recorded the lowest strain around abutment teeth compared to magnetic and locator attachments.