الفهرس 
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Abstract
Statement problem:Polyetheretherketone (PEEK) is a suitable material for using in dentistry as a fixed prosthesis; however the retention of this material is still controversial. Purpose: This study is purposed to evaluate the tensile bond strength between PEEK crowns and human dentin after different methods of surface treatments. Materials and methods: Eighty human molar teeth were prepared in standard dimensions. Polyetheretherketone (BioHPP, Bredent, Germany) crowns were fabricated and the specimens were divided according to the surface treatment method into 5 groups (n=16) as follows: gp (A) air abrasion with aluminum oxide particles (RocatecPre,particle size 110 µm, 3M ESPE , seefeld Germany), gp (AP) Piranha acid etching following air abrasion with aluminum oxide particles, gp (Si) Tribochemical treatment with silica coated particles (Rocatec plus, particle size 110 µm, 3M ESPE , seefeld Germany) gp (SP) Piranha acid etching after tribochemical treatment and gp (C) no surface treatment. Each group was then subdivided according to the use of conditioner (visio.link, BredentGmbh& Co. KG) into two subgroups: visio.link (V) and no visio.link (N). All the specimens were luted to the prepared dentin abutments using self-adhesive resin cement (G-Cem, GC, Tokyo, Japan) in a custom made static loading device. After water storage (48 hours) and thermocycling (7500 cycles, 5˚C/55˚C), the tensile bond strength of the crowns was determined with a pull-off test. Data were analyzed with 1-way ANOVA. Results:group CN that was untreated/ unconditioned showed the lowest tensile bond strength value (6.18±0.63 MPa). The highest values were found in the groups (APV and SPV) which were treated with piranha acid etching after alumina particles or silica particles air abrasion (12.03±2.4 MPa and 12.5±2.3 MP respictively). Adhesively conditioned crowns with visio.link always showed higher bond strength values than the crowns that were not treated with visio.link in the same group of surface treatment. Conclusions: The tensile bond strength of the tested PEEK crowns to dentin was improved after treatment with airborne-particle abrasion and silica coating in combination with piranha acid etching.