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

Research question For patients in a need for anterior crown, does the use of Milled BioHPP PEEK copings veneered with CAD/CAM composite resin offer better patient satisfaction, marginal adaptation and biocompatibility when compared Milled BioHPP PEEK copings veneered with manual layering? Statement of the problem PEEK exhibits a unique modulus of elasticity close to human bone/dentine so it acts as a shock absorber with stress reducing effect. Moreover from a biologic point of view, PEEK is highly compatible with surrounding tissues and it has very promising surface properties . The use of peek in anterior area is limited due to its opaque nature and grayish color, this drawback has been overcome by the use of composite layering material . PEEK restorations can be veneered with manual or CAD/CAM techniques. Information is lacking regarding the influence of the veneering technique on the patient satisfaction , precision of fit and biocompatibility of these restorations which will in turn influence their performance in patient's satisfaction. Rationale To achieve high esthetics when using PEEK it must be veneered by esthetic material 3 . It is available to be used manually or to be milled by CAD/CAM. The manual veneering of the PEEK coping with composite might affect the marginal integrity and the surrounding gingival tissues leading to decrease in the patient satisfaction, while the CAD/CAM veneering technique is proposed to have better patient satisfaction , marginal adaptation and an excellent biocompatible effect on the surrounding tissue. The importance of this trial lies in providing an alternative solution to the manual veneering technique, which will, in-turn, provide better restoration longevity results Aim of the study: The aim of this study is to evaluate the patient satisfaction ,marginal adaptation and biocompatibility of milled BioHPP PEEK copings veneered with CAD/CAM composite resin and compare them to milled BioHPP PEEK copings veneered with manual