الفهرس 
IntroductionOnly 14 pages are availabe for public view
 |  | from | 126 |  |  |
| | | from | 126 | | |
Abstract
PEEK is a polymeric material that belongs to the high-performance polymer group of PAEKs (polyaryletherketones).
PEEK has many advantages regarding its physical, biological, and mechanical properties, this composite material is used in general medicine and also in dentistry, which can be used as implant, provisional abutment and implant supported bar or clamp material. It can also be a suitable material for fixed dental prosthesis (FDPs), due to its high resiliency. It also has a high strength to weight ratio which makes it more favorable for the patients, mechanically it is similar to bone and dentin properties, in addition to its zero-corrosion rate and extremely low water absorption.
Successful long-term bond strength between PEEK frameworks and veneering composite is essential to mask its grey color. However, PEEK low surface energy and chemical inertness suggests a challenge to such bond.
Several studies proposed that the alteration of the PEEK surface with surface treatments and conditioning with an adhesive system enables a mechanical and chemical interaction between PEEK surface and veneering composite.
Objective:
The objective of this study is to evaluate Shear bond strength of PEEK to lithium disilicate ceramic disc using two classes of resin cements after different surface treatment combinations of Air abrasion, Sulfuric Acid etching and application of PEEK chemical primer.
Methods: Eighty PEEK samples were randomly divided into two groups according to the preformed surface treatment modality into group (A): air abrasion, group (S): sulfuric acid etching. Each group was then subdivided into two subgroups according to the use of visio.link primer system into Subgroup (P): primer applied and Subgroup (NP): no primer applied . Bonding of the ceramic samples was done according to the manufacturer instruction using two types of resin cement: Conventional resin cement (B) where a bonding agent was applied and Self- adhesive resin cement(L). Samples were subjected to thermocycling as a method of ageing. The shear bond strength testing was performed using a universal testing machine and failure mode was assessed.
Results:
The results showed significant difference in the shear bond values between the different PEEK surface treatments. Air abrasion led to higher shear bond strength values compared to 98%sulfuric acid etching. However, the effect was only significant when the PEEK primer was used. The type of resin cement also showed difference where conventional resin cement led to better results compared to the self-adhesive type however this was only significant in the air abrasion group combined with the primer.