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Dental Journals | Dentistry Journals | Oral Health | High Impact Articles | Scient Open Access
Journal of Dental and Oral Health


Research Article

Effect of Full Coverage, Endocrowns, Onlays, Inlays Restorations on Fracture Resistance of Endodontically Treated Molars

Ahmed Hamdy

Correspondence Address :

Ahmed Hamdy
Associate Professor
Fixed Prosthodontic Department
Faculty of Dentistry
MSA University, Egypt

Received on: September 29, 2015, Accepted on: October 29, 2015, Published on: November 09, 2015

Citation: Ahmed Hamdy (2015). Effect of Full Coverage, Endocrowns, Onlays, Inlays Restorations on Fracture Resistance of Endodontically Treated Molars

Copyright: 2015 Sato T, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

  • Abstract

Purpose: This in vitro study compared the fracture resistance of endodontically treated first maxillary molars restored with fiber posts (FRC Postec Plus-Ivoclar Vivadent) and lithium disilicate ceramic (IPS e. Max Press/ Ivoclar Vivadent) full crowns, endocrowns, onlays and inlays with respect to the observed failure modes.
Materials and Methods: Fifty sound human maxillary first molars were selected, prepared and divided into five groups. Group 1 was left intact (control), all other groups were endodontically treated, group 2 was restored with lithium disilicate full crown. Group 3: Endocrown restorations. Group 4: Onlay restorations. Group 5: Inlay restorations. All restorations were fabricated from lithium disilicate according to manufacturer instructions. Fracture resistance (N) was measured using a universal testing machine parallel to the long axis of tooth till failure. Fractures were divided into 2 groups restorable and non-restorable. The mean loads of failure of each group were statistically compared using ANOVA p<0.001. Chi-square tests were used to compare frequencies of favorable and unfavorable failure among groups.
Results: Mean failure loads were :group 1:985 N, group 2:1076 N, group 3:989 N, group 4:908 N and group 5:638 N respectively. As regard mode of failure: group 1:40% restorable, group 2:90% restorable, group 3:80% restorable, group 4:80% restorable and group 5:30% restorable.
Conclusions: 1-Full coverage, intact teeth and endocrowns showed the highest fracture resistance respectively with no significant difference. 2-Onlays then inlays showed the least fracture resistance resistance. 3-Full coverage group showed the best mode of failure and inlay showed the worst.