Assessment of Marginal and Internal Fit of High Performance Polymer PEEK Endocrown Using Two Preparation Designs

First, Participants in this study will be recruited according to inclusion criteria. Proper examination for the participants (clinically and radiographically). Preparation for endodontically treated molar for receiving high performance polymer endocrown. Checking and verification for the restoration (trying) and assessment of marginal and internal fit by replica technique. Then final cementation of endocrown.

Examination and diagnosis: Selection and examination of the patients according to inclusion and exclusion criteria. Diagnosis of the patient's chief complaint and teeth that will be involved in this study will be done. Primary alginate impressions for diagnosis on primary casts and for mounting. The patients will be asked to maintain good oral hygiene measures by using tooth brush twice daily. Taking a professional pre-operative photo. Tooth preparation procedure: Preparation of endocrown with two preparation designs on endodontically treated molars. After tooth preparation, the final impression will be taken for each participant using polyvinyl siloxane impression and temporization of cavity using light curable temporary material. Restoration trial appointment: Endocrown try in and assessment of marginal and internal fit using replica technique with light body rubber impression. Fabrication of final restoration: Delivery of high performance polymer endocrown will be fabricated according to the two preparation designs; butt and bevel.