Abstract
BackgroundThere is no ideal protocol for the surface treatment of fiber posts, especially when using a computer-aided design/computer-aided manufacturing (CAD/CAM) experimental fiberglass block. The purpose of this study was to evaluate the bond strength of a CAD/CAM customized glass fiber post and core after applying different surface treatment techniques.Material and MethodsForty premolars were prepared to receive a customized CAD/CAM glass-fiber post and core obtained from an experimental block of glass fiber and epoxy resin. The specimens were randomly distributed in 4 groups (n=10) according to the post and core surface treatment: ETH - 70% ethanol; HP - 24% hydrogen peroxide for 1 minute; ETH/S - 70% ethanol + silane; HP/S - 24% hydrogen peroxide + silane. The universal adhesive containing silane was applied on the posts and prepared post spaces in all groups. The posts were cemented using dual cure resin cement. The specimens were stored in distilled water at 37°C for 24 h, cut (two slices of 1 mm for each root third - coronal, middle, and apical) and subjected to push-out test (0.5 mm/min). Data was subjected to two-way ANOVA (surface treatment and root third) and Tukey’s test (α=0,05).ResultsThere was no significant difference of bond strength values among groups, regardless the surface treatment (p >0.05). There was significant difference on bond strength values for the different root thirds (p<0.05) (coronal>middle=apical).ConclusionsThe different surface treatment and application of additional silane in the CAD/CAM customized glass-fiber post and core does not interfere on bond strength values. The root dentin third interfered on the bond strength, with higher values for the coronal third. Key words:Post and core technique, cad/cam, shear strength, hydrogen peroxide.
Highlights
The successful rehabilitation of endodontically treated teeth depends on the amount of the remaining tooth structure, the condition of the supporting tissues, the aesthetics of the restoration and reconstruction of the intrarradicular retainer
The higher push-out bond strength values were observed for the group treated with hydrogen peroxide followed by silane application (HP/S) in the coronal third, differing from groups HP and ETH/S, both in the apical third, that showed the lowest bond strength values
Regarding the root canal third, there was a significant difference on the bond strength values, as follows: Coronal (5.76±3.13 MPa)>Middle (3.72±2.07 MPa)=Apical (3.2±2.46 MPa)
Summary
The successful rehabilitation of endodontically treated teeth depends on the amount of the remaining tooth structure, the condition of the supporting tissues, the aesthetics of the restoration and reconstruction of the intrarradicular retainer. There is no scientific evidence supporting the use of customized CAD/CAM posts to restore endodontically treated teeth, especially regarding the longevity of this treatment. There is no ideal protocol for the surface treatment of fiber posts, especially when using a computer-aided design/computer-aided manufacturing (CAD/CAM) experimental fiberglass block. The purpose of this study was to evaluate the bond strength of a CAD/CAM customized glass fiber post and core after applying different surface treatment techniques. Material and Methods: Forty premolars were prepared to receive a customized CAD/CAM glass-fiber post and core obtained from an experimental block of glass fiber and epoxy resin. Conclusions: The different surface treatment and application of additional silane in the CAD/CAM customized glass-fiber post and core does not interfere on bond strength values. The root dentin third interfered on the bond strength, with higher values for the coronal third
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