J Dent Rehabil Appl Sci.  2016 Mar;32(1):24-31. 10.14368/jdras.2016.32.1.24.

Influence of airborne-particle abrasion on flexural strength of fiber-reinforced composite post

• Sim EJ
• Kim JW
• Cho KM
• Park SH

• KMID: 2162376
• DOI: http://doi.org/10.14368/jdras.2016.32.1.24

Abstract

PURPOSE
Many studies have shown that airborne-particle abrasion of fiber post can improve the bonding strength to resin cement. But, airborne-particle abrasion may influence the property of fiber post. The purpose of this study is to evaluate the influence of airborne-particle abrasion on flexural strength of fiber post.
MATERIALS AND METHODS
Two fiber-reinforced posts; DT Light Post Size 2 (1.8 mm diameter, Bisco Inc) and RelyX Fiber Post Size 3 (1.9 mm diameter, 3M ESPE); were used in this study. Each group was divided into 3 subgroups according to different surface treatments; without pretreatment: 50 µm aluminum oxide (Cobra®, Renfert): and 30 µm aluminum oxide modified with silica (Rocatec Soft®, 3M ESPE). After airborne-particle abrasion procedure, three-point bending test was done to determine the flexural strength and flexural modulus. The diameter of each posts was measured to an accuracy of 0.01 mm using a digital micrometer. There was no diameter change before and after airborneparticle abrasion. The mean flexural moduli and flexural strengths calculated using the appropriate equations. The results were statistically analyzed using One-way ANOVA and Scheffe's post-hoc test at 95% confidencial level.
RESULTS
There was no significant difference on flexural strength between groups.
CONCLUSION
In the limitation of this study, flexural strength and flexural modulus of fiber post are not affected by airborne-particle abrasion.

Keyword

airborne-particle abrasion; flexural strength; FRC post; three-point flexural test

MeSH Terms

Aluminum Oxide
Resin Cements
Silicon Dioxide
Aluminum Oxide
Resin Cements
Silicon Dioxide

Figure

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  Fig. 1 SEM micrographs of DT Light post with different surface treatment (A - C) and after flexural test (D - F) (magnification, ×400). (A, D) No treatment, (B, E) 50 μm aluminum oxide, (C, F) 30 μm aluminum oxide modified with silica.

• 

  Fig. 2 SEM micrographs of RelyX Fiber post with different surface treatment (A - C) and after flexural test (D - F) (magnification, ×400). (A, D) No treatment, (B, E) 50 μm aluminum oxide, (C, F) 30 μm aluminum oxide modified with silica.

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