Vol - 25, Issue - 6
About the Journal
[This article belongs to Volume - 25, Issue - 6]
International Medical Journal
Journal ID : IMJ-23-05-2020-477
Total View : 302

Abstract : The purpose of this in vitro study was to evaluate the effect of preparation design of glass fiber post retained crowns, endocrowns with shoulder finish line and endocrowns with butt joint margin on fracture resistance and failure mode of maxillary first premolar restored by lithium disilicate material. Thirty-six sound maxillary first premolars were used that decapitated 2 mm above CEJ from proximal surface and endodontically treated. They were randomly divided into 3 groups (n=12), in which, teeth were prepared to receive all- ceramic restorations made from lithium disilicate material (IPS E-max CAD, Ivoclar-Vivadent). GA: Endodontically treated teeth (ETT) restored with fiber posts and cores prepared with shoulder finish line retained crowns (n=12), GB: ETT restored with endocrowns with shoulder finish line(n=12) and GC: ETT restored with endocrowns with butt joint margin. Teeth of all groups were prepared by (Computerized numerical controlled milling machine (CNC milling machine) then the lithium disilicate restorations were made by CAD/CAM system and adhesively cemented with dual-cure resin cement. Specimens were mounted in a universal testing machine (LARYEE Universal testing machine, China). Each specimen was loaded to failure at a crosshead speed of 0.5 mm /min. Mode of failure was also observed. Data were analyzed using one-way analysis of variance (ANOVA) and Tukey’s post hoc significance difference tests. Differences were considered significant at P<0.05. One -way ANOVA test showed that group (GC) recorded statistically significant (p<0.05) with the highest mean value (1698.92) followed by (GA) (1444.17) then (GB) (1271 N) recorded the lowest mean value. Pair-wise Tukey’s post-hoc test showed significant (p<0.05) difference between GC and GB groups. The clinical significance of this study relates to decision which restoration is most suitable for severely damage endodontically treated and if conservative preparation have effect on the fracture resistance of classical crown with ferrule retained by post –core restoration, endocrown with ferrule or endocrown butt joint margin

Our Certificates
Certificates
Certificates
Certificates
Certificates
Certificates
Certificates
Certificates
Certificates
Certificates
Certificates
Certificates