الفهرس 
IntroductionOnly 14 pages are availabe for public view
 |  | from | 101 |  |  |
| | | from | 101 | | |
Abstract
Objective: This in vitro study was conducted to evaluate the influence of surface treatment on flexural strength of computer aided design/computer aided manufacturing (CAD-CAM) fabricated polyetheretherketone short span Bridges using different surface treatment method. Materials and methods: Twenty-one 3-unit FDPs frameworks replacing a first molar with abutments on 2nd premolar and 2nd molar and were prepared in a standardized method by a steel model was used with 2 abutments, which will also make of steel to minimize their residual deformation during loading. 21 impressions of the model with steel abutments were taken by replisil silicone impression material (REPLISIL 22N, dent-e-con,Germany) then poured in epoxy resin to produce the epoxy resin models. After scanning of the steel model using CAD/CAM optical scanner (SHERA Werkstoff- Technologie GmbH & Co. KG Espohlstrasse Lemförde, Germany). Three group of standardized three-unit FDPs framework was made of Bio HPP blank using (CAD/CAM) milling machine (Imes-Icore GmbH Im Leibolzgraben, Eiterfeld / Germany) with flat occlusal surface (n=7/group) were fabricated. Cementation of the specimens were done using dual cure resin adhesive (Panavia F2). The specimens were divided into 3 groups (n = 7) to receive different surface treatment materials. group I Consists of seven samples (n=7) of peek framework without any surface treatments as a controlled group. group II Consists seven samples (n=7) which were abraded by airborne particles with a mean particle size of 110 μm Aluminium oxide (Al2O3) at 2.5 bar air pressure at a working distance of 7 mm for 15 second. group III: Consists of seven samples (n=7) which were etched with (98%) sulfuric acid for 60 seconds followed by washing in running water for one minute. Scanning electron microscopy was performed to analyze morphological examination only. Flexural strength values were evaluated by three-point bending test using ”Instron testing machine”. Data were analyzed for statistical significance using one-way ANOVA analysis of variance. Results: Different techniques used in surface treatment had an effect on the flexural resistance. Regarding these techniques, the initial flexural resistance of all test groups showed statistical significance difference. Sulfuric group had the highest value (893.429 ±153.314 Mpa) and Controlled group had the lowest value (330.408 ± 19.183 Mpa). Conclusion: Bio-HPP Framework which treated by sulfuric acid showed the highest flexural strength.