Effect of Endodocrown Materials on fracture strength of Endodontically Treated Teeth; comparative in vitro study

Document Type : Original Article

Authors

1 Associate Professor of Fixed Prosthodontics, Faculty of Dentistry, Fayoum University

2 Associate Professor, Endodontics, Faculty of Dentistry, MSA University, 6th of October city, Egypt

Abstract

ABSTRACT
Objective: To asses the effect of different CAD/CAM endocrown materials on fracture strength of endodontically treated mandibular molars.
Materials and Methods: Thirty mandibular second molars were selected and randomly divided into three groups (n=10 each). Group 1; the control group were left intact, where neither root canal treatment nor preparation were performed, Group 2 and group 3 were endodontically treated, mounted in epoxy resin blocks and prepared to receive endocrowns using CADCAM. Groups 2 and 3 were individually scanned; endocrowns were designed and milled in Grandio Bloc with high filler loading (HFL) about 86% filler and e.max CAD blocks respectively. Each endocrown was verified for fit, and adhesively cemented using standard bonding protocol to its respective molar. Then all samples were subjected to fracture resistance using universal testing machine by compressive mode under occlusally applied load at a crosshead speed of 0.5 mm/min, fracture loads were recorded in Newtons (N). Statistical analysis of variance (One–Way ANOVA) and Kolmogorov Smirnov and Shapiro- Wilk test was performed and significance level was set at 0.05.
Results: there was a significant difference between different groups (f=6.54, p=0.005). The highest value was found in Grandio (2572.67±280.28), followed by the control group (2546.94±103.54), while the lowest value was found in e.max (2186.59±352.92). Post hoc pairwise comparisons showed e.max to have a significantly lower value than other groups (p < 0.001).

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Egyptian Dental Journal
Volume 68, Issue 3 - Serial Number 5
July (Conservative Dentistry and Endodontics)
July 2022
Pages 2933-2943

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