الفهرس 
Clinical evaluation and patient satisfaction of shade matching between natural teeth and monolithic all-ceramic crowns fabricated from two materials
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Abstract
Aim: Clinicians face increasing demands and expectations for accurate color matching. As the patients pay more attention to esthetics. Thus, precise color matching has become even more integral to the success of an esthetic restoration. The aim of the present study was to evaluate color difference between zirconia reinforced lithium silicate ceramic (Celtra Press) VS lithium disilicate glass ceramic (e.max) in relation to natural tooth structure to determine which monolithic material will provide restoration with exact shade and optical properties as natural tooth structure. Materials and Methods: 20 teeth esthetic zone requiring full coverage crown -with their adjacent/contralateral are sound and not severely discolored - were prepared to receive an all ceramic crown. The crowns will be divided into two groups: I: Teeth receiving crowns fabricated from IPS e.max press (Ivoclar Vivadent) II: Teeth receiving crowns fabricated from Celtra Press (Dentsply Sirona). Patient satisfaction of the two groups assessed using the Visual Analogue Scale (VAS) which is Binary and documented in chart including number of satisfied and unsatisfied. Shade matching to the contral lateral tooth was evaluated by 3 experienced evaluators modified United States public health service (USPHS) criteria as Alpha (Excellent), Bravo (Acceptable), charlie (Acceptable but modifications needed), and Delta (Unacceptable). The color difference xE (perceptibility threshold) was measured using intraoral spectrophotometer and evaluated for each group. Results: Patient satisfaction was graded according to the visual analogue scale (VAS). There was no statistically significant difference between (group I) and (group II) where (p=1) as both groups showed (100%) Alpha