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Register a new userThe 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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Added by
Damascus University ورقة بحثية
Publication date
2011
fields
Dentistry
and research's language is
العربية
Created by
Shamra Editor
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هدف هذه الدراسة هو اختبار مقاومة الكسر للتيجان ذات القلنسوات المصنعة من الزيركونيا وفق طريقة ال CAD/CAM بسماكتين مختلفتين و معرفة تأثير تقليل سماكة القلنسوة في مقاومة التيجان للكسر، و دراسة أنماط الفشل.
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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