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The inflence of the thickness of Zirconia core Made by CAD/CAM on the fracture resistance of crowns (in vitro study)

تأثير سماكة القلوب الزيركونية المصنعة بطريقة ال CAD/CAM في مقاومة التيجان للكسر (دراسة مخبرية)

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 Publication date 2011
  fields Dentistry
and research's language is العربية
 Created by Shamra Editor




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Background& Objective: This study was carried out to test fracture resistance of crowns with Zirconia core made by CAD/CAM of two thicknesses, and test the influence of decreasing the core thickness on its fracture resistance, and study the patterns of failure.



References used
Zarone F. ,Russo S., SorrentinoR.From porcelain-fused-to-metal to zirconia: Clinical and experimental considerations . J Dent Mater 2011;27:83-96
Al-AmlehB.,LyonsK.,Swain M. Clinical trials in zirconia: asystematic review. J Oral Rehabil 2010; 37: 641– 652
Hämmerle C,SailerI,Thoma A, Gianni H,Suter A, Ramelc.Dental Ceramics essential Aspects for clinical practice. Quintessence publishing Co.Ltd (2008).p:2-5,9,16,20,21,39,86
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several factors should be considerate when fabricating zirconia-based crowns to achieve maximum shade symmetry with adjacent natural teeth. Abutment color is one of the before most important factors due to its effect on the final restoration ceme ntation. Therefore, this study aims to detect the effect of different abutment shades on zirconia-based crown color.
Replica technique remain most commonly used technique for measuring the marginal fit in the medical literature, the silicone rubber addition is considered most accurate and least changing dimensions. Aim of study to compare the accuracy and simpl icity of traditional replica technique and modified replica technique to measure marginal fit of zirconium posterior bridges manufactured by CAD\CAM. After removal of first lower molar from TYPODENT (Frasco, Tettnang, Germany), the second lower molar and premolar neighboring were prepared commensurate with full ceramic restoration. Final impression of this bridge was taken by silicone rubber addition (Zhermack Elite HD+) with the aid of custom tray. The impression was condensed with amalgam to make the main metal cast. Fifteen custom acrylic resin trays were used for fabricate fifteen impressions of main metal cast that were used for fabricate 15 zirconium bridges by CAD\CAM technique According to the manufacturer's instructions. Tow rubber thicknesses were taken for the marginal fit of each bridge over its cast gypsum by used light silicone rubber addition. Then the first rubber thickness was treated by developed replica technique to form the Group (A) of the study and the second rubber thickness was treated by replica technique to form the group (B) of the study. Depending on T-test, no significant difference between two techniques was detected. We conclude that developed replica technique reliable technique to study and measure the marginal gap of bridge and crown, and it is statistically more accurate than the traditional technique.
Porcelain has a long history of fixed prosthodontics to achieve optimum beauty by color. However, there is a lack of information on how the color of different thicknesses of ivory porcelain is affected by repeated exposure to baking.
Porcelain is used in thin thicknesses to fabricate ceramic veneers. The low fusing feldspathic porcelain used to fabricate porcelain veneers is easily fractured, brittle porcelain before cementation to tooth structure. However, its fracture resist ance improves significantly after etching with hydrochloric acid, applying the silane and luting to tooth structure with resin cement. Aim of the study: to evaluate the appropriate thickness of laminates made from feldspathic porcelain and its relation to flexural strength.
Recent development in dental materials had led to the fabrication of metal free fixed prosthodontics to improve the mechanical and aesthetic properties to restore posterior teeth depending on many techniques, therefore came the propose of this stud y to compare the marginal fit of Zirconia bridges made by CAD/CAM and Slip-Cast techniques. 30 Bridges were fabricated to restore missing first lower molar, they were divided into two groups (15 CAD\CAM, 15 Slip-Cast). The marginal fit was evaluated by measuring the thickness of light body silicone that made using Replica technique. Depending on T-test, the mean marginal discrepancy for CAD/CAM groups was 13.92μ and 11.30μ for Slip-Cast techniques. Therefore, it was concluded that the marginal fit of Slip-Cast techniques was significantly better than CAD/CAM techniques.

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