THE EFFECT OF DIFFERENT SURFACE TREATMENTS ON THE PUSH-OUT BOND STRENGTH OF CAD/CAM MILLED ZIRCONIA POSTS (IN VITRO STUDY)

Document Type : Original Article

Authors

1 Fixed Prosthdontics Department, Faculty of Dentistry, Alexandria University, Alexandria, Egypt

2 Professor of Fixed prosthodontics, Faculty of Dentistry, Alexandria University, Alexandria, Egypt.

3 Lecturer, Department of Conservative Dentistry, Faculty of Dentistry, Alexandria University.

Abstract

Background: Badly destructed teeth receiving root canal treatment is a main indication for post and core foundation. Zirconia posts were also a good treatment option as they combine strength and esthetics. Different methods were made to try to enhance the bonding capability of zirconia to dentinal walls.
Aim of the study: The aim of the present study was to evaluate the effect of different surface treatments on the bond strength of zirconia to the dentinal walls.
Materials and Methods: Thirty endodontically treated human maxillary central teeth were used. The specimens were randomly divided into three groups according to the surface treatment the post received. Group (I) tribochemical silica coating, Group (II) CO2 laser irradiation and Group (III) Er.Cr:YSGG laser irradiation. Push-out bond strength was tested using a universal testing machine at a cross head speed of 0.5mm/min until post debonding occurred then the bond strength values were calculated.
Results: There was a statistically significant difference in the debonding load (Mpa) among the three studied groups (p <0.05). Group I had a mean of debonding load of (12.20±0.90 MPa) and (10.20±0.74 MPa) for group II while the mean of debonding load for Group III was (6.22±1.17 MPa)
Conclusion: Tribochemical silica coating was found to be the best surface treatment method for the zirconia ceramic surface when compared to CO2 and Er.Cr:YSGG laser irradiation and would serve as a successful surface treatment option for zirconia ceramic prior to bonding.

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Alexandria Dental Journal
Volume 47, Issue 2
B (Endodontics, Prosthodontics, Fixed prosthodontics, Conservative dentistry, Dental Biomaterials)
August 2022
Pages 127-133

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