الفهرس 
AcknoledgementsOnly 14 pages are availabe for public view
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Abstract
The maxillary esthetic zone remains a critical area when it comes to the restoration of single implant-supported crowns. An ideal esthetic implant restoration is defined as a combination of a visually pleasing prosthesis and healthy harmoniously scalloped peri-implant soft tissues. Several clinically successful all-ceramic materials have been developed for implant restorations. Among these the highly esthetic lithium disilicates and recently also the resilient hybrid ceramics.
The aim of this study was to evaluate the effect of polymer-infiltrated-ceramic-network hybrid abutment crown on pink and white esthetics in comparison with lithium disilicate. Eighteen patients were enrolled in the study. Each patient received a single screw-retained hybrid abutment crown of either IPS e.max CAD or VITA ENAMIC and was followed up for 6 months. The pink and white esthetics were evaluated by three blinded assessors of different specialities using PES/WES esthetic index. Regarding the combined PES/WES and the PES, no statistically significant difference was found between IPS e.max CAD and VITA ENAMIC hybrid abutment crowns at any timepoint. The investigator therefore failed to reject the first null hypothesis that polymer-infiltrated-ceramic-network hybrid abutment crown would give similar pink esthetic results when compared to the lithium disilicate hybrid abutment crown. However, regarding the white esthetic score, a statistically significant difference was found between the two groups, favouring IPS e.max CAD and therefore, the second null hypothesis that polymer-infiltrated-ceramic-network hybrid abutment crown would give similar white esthetic results when compared to the lithium disilicate hybrid abutment crown was rejected.