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Comparison of the Marginal Fitness of the Ceramic Crowns Fabricated with Different CAD/CAM Systems (An In Vitro Study)

Authors: Akram M. Abdulkareem اكرم عبد الكريم --- 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: 4 Pages: 28-33
Publisher: Baghdad University جامعة بغداد

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Abstract

Background: The marginal fit is the most characteristic that closely related to the longevity or success of a restoration, which is absolutely affected by the fabrication technique. The objective of present in vitro study was to evaluate the effect of four different CAD/CAM systems on the marginal fit of lithiμm disilicate all ceramic crowns.Materials and Methods: Adentoform tooth of a right mandibular first molar was prepared to receive all ceramic crown restoration with deep chamfer finishing line (1mm) and axial reduction convergence angle of 6 degree, dentoform model duplicated to have Nickel-Chromiμm master die. Thirty two stone dies produce from master die and distributed randomly in to four groups (8 dies for each group) according to the type of CAD/CAM system that used: Group A: fabricated with CERAMILL motion2 (Amann Girrbach); Group B:fabricated with CEREC in lab MCXL (Sirona);Group C: fabricated with CORiTEC 250i (imes-icore); Group D: fabricated with ZIRKONZAHN M5 (Zirkonzahn). Marginal discrepancy was measured at four points at each tooth surface. Sixteen points per tooth were measured using digital stereomicroscope at (140X) magnification.Results: ANOVA and LSD post Hoc tests were used to identify and localize the source of difference among the groups. It was found that there is a highly significant difference in the marginal gap mean values between group C and group D, and highly significant differences between group A and group D.Conclusions: From the above result we can conclude that better marginal fit values were may be exhibited by CORiTEC 250i CAD/CAM system.


Article
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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