الفهرس 
IntroductionOnly 14 pages are availabe for public view
 |  | from | 163 |  |  |
| | | from | 163 | | |
Abstract
Purpose: This study aimed to investigate and compare wear of telescopic attachments constructed from different tooth colored materials by evaluating surface changes of both primary and secondary copings using Scanning Electron Microscope (SEM). Materials and methods: Three identical clear acrylic resin models of completely edentulous mandibular arch were fabricated for this study. Two implants were installed bilaterally in canine region of the models by the aid of guide template. The models were scanned to design resilient telescopic attachment using CAD/CAM technology on the 3D virtual model image. According to the material used to fabricate the telescopic attachment, the models were categorized as follows: 1-st group (PP) where primary and secondary telescopic copings were constructed from (Polyetheretherketone) Peek , 2-nd group (ZZ) where primary and secondary telescopic copings were constructed from zirconia, and 3-rd group (ZP) where the primary copings were made from zirconia and secondary ones were made from PEEK. Three identical mandibular complete overdentures were constructed. The secondary telescopic copings of each group were picked up in the overdenture fitting surface. Surface changes of primary and secondary copings were evaluated using scanning electron microscope (SEM) at time of secondary copings pickup (T0) and after simulation of 6 months of overdenture use (T6). Results: Significant wear changes were shown within each group between T0 and T6 and between groups in both primary and secondary copings where the highest wear was found in ZP group followed by PP group and ZZ group respectively.Conclusions: With respect to limitations of this study, it could be concluded that: Combining PEEK and Zro2 materials for telescopic attachment construction may be associated with more changes in surface topography in comparison to all PEEK or all zircon telescopic attachments.