Effect of Two Different Surface Treatments on Retention of Cosmopost with Two Different Core Materials
Received 28 October 2019
Accepted for publication 15 February 2020
Published 30 March 2020 Volume 2020:12 Pages 87—100
Checked for plagiarism Yes
Review by Single-blind
Peer reviewer comments 2
Editor who approved publication: Professor Christopher E. Okunseri
Mohamed A Qudaih,1 Salah A Yousief,1,2 Mahmoud NM Allabban,1 Ali Abkar Mohammed Nejri,1 Ahmed Mohamed Elmarakby3,4
1Department of Restorative Dental Sciences, AlFarabi Private College for Dentistry and Nursing, Jeddah, Kingdom of Saudi Arabia; 2Department of Fixed Prosthodontic, Faculty of Dental Medicine, Al-Azhar University, Assiut Branch, Cairo, Egypt; 3Department of Restorative Dental Science, AlFarabi Colleges for Dentistry and Nursing, Riyadh, Kingdom of Saudi Arabia; 4Department of Operative Dentistry, Faculty of Dental Medicine, Al-Azhar University, Assiut Branch, Cairo, Egypt
Correspondence: Ahmed Mohamed Elmarakby Tel +966506676440
Objective: The objective of this study was to determine the effect of Cosmopost’s two different surface treatments (sandblasting and silica coating) on persistence to various core materials using push-out test set-up.
Material and Methods: A total of 30 Cosmoposts was used in this study. Cosmoposts were divided into three groups (10 samples each) according to the post-surface treatment received. Every category was additionally subdivided into two subgroups according to the type of core material (n = 5 samples). A specially designed copper mold was used for construction of different core materials with standardized dimensions around the posts, in such a way to ensure that the posts will be centralized. Surface roughness was estimated for all Cosmoposts, following different surface treatments using SEM. Cylindrical cores were fabricated of either composite resin or heat-pressed zirconia-containing glass-ceramic (IPS Empress Cosmo, Ivoclar Vivadent). Following the construction of different Core materials, samples were subjected to push-out test set-up to Evaluate the impact of various treatments on post/core bond strength. Data were collected, tabulated and statistically analyzed. SEM was performed on Cosmoposts following debonding of different post/core samples to determine their mode of failure.
Results: Results of push-out bond strength revealed that core material, surface treatment and the interaction between the two variables using Two-way ANOVA had a statistically significant effect on mean push-out bond strength. Regarding the effect of type of core material on Push-out bond strength, results showed that IPS Empress Cores showed statistically significant higher mean push-out bond strength to Cosmopost (36.4± 9.7MPa) than composite cores (15.8± 2.5 MPa).
Conclusion: Within the limitations of this study, direct heat-pressed ceramic core was more beneficial for zirconia post buildups, than Composite Cores, since they provided higher bond strength. Thanks to a double improvement: increase in fracture resistance and retentive capacity to post. Also, Tribochemical Silicacoating technique was proved to be more effective in Cosmopost treatments than sandblasting technique.
Keywords: sandblasting, Cosmopost, push-out bond strength, IPS Empress
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