الفهرس 
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Abstract
Aim: To compare surface roughness of glazed versus polished lithium disilicate crowns as well as wear of enamel antagonists.
Methodology: Twenty-two full coverage crowns were fabricated for posterior teeth. Scaling and polishing was performed for all the patients one week prior to preparation. The patients were divided into two groups according to crown finishing. group 1(control group) fabricated from IPS e.max glazed crowns and group 2 (intervention group) fabricated from IPS e.max polished crowns. The preparation was standardized with supra-gingival, chamfer finish line for all teeth. Fabrication of the crowns was done using lost wax press technique. The restorations were glazed with e.max ceram glazing liquid; an even layer was applied on the entire surface of the crown using a brush. Polishing was performed using EVE abrasive rubbers. Polishing of each crown was performed with rubbers of three different grains, beginning with the most abrasive one (light crimson) for shaping, then an intermediate one (crimson) for pre polishing, and the last, a less abrasive one (yellow)for high shine polishing. Self-adhesive cement was used for both groups. Roughness of crowns as well as opposing teeth wear were measured using non contact 3D profilometer, patient satisfaction was evaluated in the form of questionnaire.
Results: ANOVA was used to compare between the two groups; there was statistical significant difference between mean PD at the two materials’ sides where polished lithium disilicate crowns showed smoother surface than glazed lithium disilicate crowns. There were also statistical difference concerning opposing enamel wear where glazed lithium disilicate crowns exerted more enamel wear to opposing teeth than polished lithium disilicate crowns.No statistically significant difference between both groups regarding patient satisfaction (color, shape, ease of cleaning and chewing ability).
Conclusions: Polished pressable lithium disilicate monolithic crowns are smoother than glazed crowns, both finishing protocols yield high patients’ satisfaction and fine diamond is preferable to be used to polish lithium disilicate that have been adjusted; to make them wear compatible with enamel. Thus, this study was against the null hypothesis. Therefore careful checking of glazed occlusal surface one year post-cementation is recommended.