ASSESSMENT OF PUSH-OUT BOND STRENGTH OF PEEK POSTS CONSTRUCTED USING OPTICAL IMPRESSION TECHNIQUE (AN IN VITRO STUDY)

Document Type : Original Article

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Fixed prosthodontics department, Faculty of Dentistry, Cairo University, Egypt

Abstract

Aim: Evaluation of push out bond strength of PEEK custom made post made with direct scanning of post space versus scanning of conventional impression (Addition silicon) of the post space.
Methods: Twenty-Six single rooted teeth were chosen then endodontically treated and prepared at depth 12 mm for receiving post and core restorations. The samples were randomized into two equal groups:
group I, CAD/CAM PEEK post and core restorations were obtained by direct scanning intracanal space. For group II, polyvinylsiloxane impressions (addition silicon) of the post space were scanned. Post and core restorations were milled and cemented on their respective teeth. All of the 26 specimens were then sectioned horizontally, and the post and core push-out bond strength were evaluated using a universal testing machine.
Results: Push out bond strength values were non-significant between direct scanning post space and scanning conventional impression post. The bond strength was slightly higher for coronal third than middle and apical third within non-significant range.
Conclusion: within the limitations of this study Direct scanning by prim scan offers a viable and clinically acceptable alternative to the conventional impression technique and can be used successfully for manufacturing custom post and core restorations.

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