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The Marginal Fitness of CAD/CAM All Ceramic Crowns Constructed by Two Types of Direct Digitization Techniques (An In Vitro Study)

Authors: Rana M. Khdeir رنا خضير --- Adel F. Ibraheem عادل فرحان ابراهيم
Journal: Journal of baghdad college of dentistry مجلة كلية طب الاسنان بغداد ISSN: 16800087 Year: 2016 Volume: 28 Issue: 2 Pages: 30-33
Publisher: Baghdad University جامعة بغداد

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Abstract

Background: In capturing a negative image, the digital impression secures a digital record for the purposeofdesigning and creating restorations. The introduction of scanning system presents a paradigm shift in the way of thedental impression procedure and encourages the accuracy of obtained restoration especially in the marginal areaas a result of producing accurate final impression The digital system offers many advantages over theConventional method.. The objective of this present in vitro study was to evaluate the marginal fitness of all ceramiccrowns fabricated by direct digital scanning of the prepared tooth using two types of intra-oral cameras (Bluecamcamera with strip light projection technique and Omnicam camera with video sampling technique).Materials and Methods: Sixteen sound upper first premolar teeth of comparable size were collected. Standardizedpreparation of all teeth samples were carried out to receive all ceramic crown restoration with deep chamferfinishing line (1mm), axial length (4mm) and convergence angle (6◦). The specimens divided in to two groupsaccording to the type of digital impression technique: Group A, eight prepared teeth scanned directly by Bluecamcamera; Group B, eight prepared teeth scanned directly by Omnicam camera. Then CAD/CAM all ceramic crownsconstructed for each tooth sample.Marginal discrepancy was measured at Sixteen points per tooth using digital microscope at (120X) magnification.Results: Independent sample t-test was used to identify and localize the source of difference among the groups. Itwas found that there is statistically non- significant difference in the marginal gap mean values between (group Aand group B).Conclusions: From the above result we can conclude that the two types of direct digitization techniques have thesame accuracy

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