الفهرس 
IntroductionOnly 14 pages are availabe for public view
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Abstract
Purpose: the purpose of this in vitro study was to evaluate the marginal fitness of vonlay nano-ceramic hybrid restorations using different computer add imaging technique (an in vitro study). Materials and methods: Thirty 3D printed models of prepared premolar (no. 14) for vonlay restoration were fabricated using epoxy resin material and used for fabrication of thirty nano-hybrid ceramic vonlays (Grandio Disc, VOCO, Germany). three groups (n=10) of vonlays were fabricated using three different imaging technique: group 1: Imaging of conventional impression of master die, group 2: Imaging of stone master die and group 3: Imaging of master die using chairside TRIOS® Intraoral Scanners (3Shape, Copenhagen, Denmark). vonlays were designed by using a CAD design software program(Exocad Dental CAD, Exocad, Germany). The vonlays were cemented over their corresponding dies with an auto mix dual cure adhesive cement system (Duo-Link universal resin cement, Bisco, Inc. Schaumburg USA) under a static load by using custom made seating device. Digital microscope was used to measure the vertical marginal gap for each. where a total of 120 measurements for the 3 groups (12 sites per vonlay and 10 vonlays per group) were evaluated. One-way ANOVA test was used to analyze the results, student sample t-test was used to examine the marginal gap (MG) differences of each group and in the same group. Results: A significant difference (P<.001) was found between the MG values of the vonlay restoration fabricated by using different imaging technique. The smallest MGs were obtained with vonlay fabricated using chairside Intraoral Scanners as compared with imaging of master die impression and stone master die. But, there was no significant difference between the MG measurements of different sides in the same group. Conclusion: The smallest MGs were obtained with vonlay fabricated using chairside Intraoral Scanners.