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A study to compare the internal fitness and marginal gap between single crowns and crowns within three-unite bridge of zirconia substructure fabricated by CAD-CAM system. (An In vitro study)

Authors: Auday M. Asady --- Haitham J Al azzawi هيثم جاسم العزاوي
Journal: Journal of baghdad college of dentistry مجلة كلية طب الاسنان بغداد ISSN: 16800087 Year: 2017 Volume: 29 Issue: 1 Pages: 27-31
Publisher: Baghdad University جامعة بغداد

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Abstract

Purpose: the aim of this in vitro study was to compare the marginal gap and internal fitness between single crowns and the crowns within three-unit bridges of zirconium fabricated by CAD-CAM system.Materials and methods: A standard model from ivoclar company was used as a pattern to simulate three-units bridge (upper first molar and upper first premolar) as abutments used to fabricate stone models, eight single crowns for premolar and eight of three units bridges. Crowns and bridges fabricated by CAD-CAM system were cemented on their respective stone models then sectioned at the mid-point buccolingaully and misiodistaly and examined under stereomicroscope.Result: the marginal gap in premolar crowns and premolar within bridge were within the acceptable value 120μm, one –way ANOVA showed that there was significant differences in the internal gaps among the areas. Independent t- Test showed there was significant differences between the premolar crowns and premolar crowns within bridges in marginal opening and cusp tip (lingually and distally)Conclusion: the marginal and internal gaps were in the bridge higher than those in the crowns. The areas of sloped surfaces such as chamfer area, occlusal area and cusp tip had high gap values in comparison with areas of flat surfaces such as axial wall and when the surface area of abutment increased, the marginal and internal gaps of abutment was increase.


Article
Comparison of marginal adaptation, internal fitness and microleakage of Zolid, Zirconia and Empress 2 all-ceramic crown materials (An in vitro study)

Authors: Dr. Ammar Atta-Allah Ali B.D.S., M.Sc., Ph.D. د. عمار عطا الله علي --- Dr. Nasr Rifat Sabea. B.D.S., M.Sc. د. نصر رأفت
Journal: MUSTANSIRIA DENTAL JOURNAL مجلة المستنصرية لطب الاسنان ISSN: 18138500 Year: 2013 Volume: 10 Issue: 2 Pages: 184-192
Publisher: Al-Mustansyriah University الجامعة المستنصرية

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Abstract

The purposes of this in vitro study were to compare the marginal adaptation,internal fitness and the microleakage of three CAD-CAM all ceramic crownsmaterials: Zolid, Zircon, and Empress 2. This study also evaluated the correlation ofmicroleakage of these ceramic crowns materials to the marginal fitness.Forty-five maxillary first premolar teeth were prepared with 2-mm occlusalreduction and 1-mm all around shoulder finish line, teeth were randomly divided intothree main groups according to the type of ceramic material that was used (n=15).Group 1: received a CAD-CAM Ceramill Zolid® unilayered transparent zircon Group2: received a CAD-CAM Ceramill ZI units (Zirconium oxide) Group 3: received aCAD-CAM Ceramill wax units that would subsequently invested and heat pressed tofabricate a hot-press ceramic crowns.The results showed statistical significant difference in marginal fitness, internalfitness and microleakage between Zolid group and other groups (P>0.0001). Therewas highly significant correlation of the marginal and internal fitness, whilst there wasno significant correlation marginal fitness and microleakage.

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