Patient Satisfaction , Marginal Adaptation And Biocompatibility of Milled Biohpp Polyetheretherketone (PEEK) Single Anterior Crowns Veneered With Two Different Techniques.

Intervention: Examination and diagnosis: - Selection and examination of the patients according to inclusion and exclusion criteria. Diagnosis of the patients' chief complaint and teeth that will be involved in this study will be done then performing proper scaling and polishing procedure, Primary impression will be taken to produce study cast. The patients will be asked to maintain good oral hygiene measures by using tooth brush twice daily. - Taking a pre-operative professional photo, Tooth preparation procedure: Recording the sulcus depth and gingival condition prior to preparation, Conservative tooth preparation will be prepared after local anesthesia has been given as required., Full coverage preparation will be carried out , After tooth preparation, adequate 2ry Impression using non aqueous elastomeric impression materials and bite registration will be taken., Fabrication of the temporary restoration using composite resin temporary material and cemented using non Eugenol Zinc Oxide temporary cement, Fabrication and cementation of restoration: Bio-HPP will be supplied in the form of discs to fabricate crown core by CAD/CAM technology then veneered with two veneering techniques; the CAD/ CAM and the manual technique using the visio.lign system of appropriate shade. The finished Bio HPP crown will be cemented by adhesive resin cement according to manufacturer instruction, Criteria for discontinuing: Restoration will be removed when there are any signs of leakage, fracture or severe post-operative pain due to pulpal response and replaced by a temporary restoration cemented with Ca (OH) cement in order to alleviate pain, Strategies to improve adherence to intervention protocol: - ''In the first visit, a Face to Face adherence session will be held in which the patient should be informed about the study steps and how to maintain oral hygiene measures. Further sessions will occur at the follow-up visits.8 Participant patients will be asked about any problems they are having. Patients will be recalled every three months for one year for follow up visits. Permitted or prohibited interventions: Oral hygiene measures are permitted for enhanced results while using hard tooth brushes or abrasive containing tooth paste after intervention are prohibited.