Abstract
Objective This in vitro study was designed to evaluate the influence of an Er,Cr:YSGG laser on the bond strength of zirconia and glass fiber posts with root dentin. Materials and methods Ninety extracted single-rooted human teeth were randomized into 6 groups (n = 15/group) on the basis of different posts (zirconia/glass fiber) and Er,Cr:YSGG laser tips (axial and radial). Specimens were prepared for push-out testing with the help of a cutting machine; six slices (2 on each cervical, middle, and apical) of approximately 1 mm thickness were sectioned for all roots on a plane perpendicular to the long axis of the post. All specimens were placed into a universal testing machine with a defined 0.5 mm/min crosshead speed until the maximum failure load was obtained. Results The highest mean push-out bond strength of the glass fiber and zirconia groups was achieved with laser treatment. The highest push-out bond strength was achieved with the axial fiber tip (7.63 ± 1.22 MPa), and the lowest was achieved with a radial fiber tip of the glass fiber group (6.98 ± 0.96 MPa). ANOVA showed a statistically significant difference between the groups (p = 0.041). The mean push-out bond strength was found to be higher with an axial fiber tip for both cervical and apical segments in the glass fiber and zirconia groups (p < 0.05). The independent t-test resulted in the overall highest mean push-out bond strength in the apical segments (p = 0.026). Conclusion Within the limits of the present in vitro research study, an enhancement in the push-out bond strength of resin cement, mainly in the cervical region of the root canal, was achieved after irradiation with an Er,Cr:YSGG laser using an axial fiber tip.
Highlights
Dental posts are used in cases where the tooth structure is extensively deteriorated and requires strong support [1]. e long-term success of endodontic-treated tooth depends on several factors including post surface/interface, root dentin, and the resin cement that helps to tether the post within the root structure [2]. e efficacy of bonding among the three components may aid in the distribution of forces along the root system [3]
Data from previous studies suggest that laser irradiation enhances surface modification on dental posts, which greatly increases the bond strength with resin cements [20,21,22]. e laser therapy of a target dental material differs depending on the laser parameters used, such as wavelength. e in vitro data seeking to improve the adhesive resin cement-post-dentin interface warrant further investigation. erefore, this in vitro study was designed to evaluate the influence of Er,Cr: YSGG laser on the bond strength of zirconia and glass fiber posts with root dentin
Normality testing showed all the variables to be normally distributed after the Shapiro–Wilk test. e study groups without laser treatment were designated as I and IV for the glass fiber and zirconia posts, respectively. e axial fiber tips for both glass fiber and zirconia were designated as II and V, whereas III and VI were assigned to glass fiber and zirconia, respectively (Table 1). e highest mean push-out bond strength of glass fiber and zirconia posts was achieved with laser treatment. e highest push-out bond strength was achieved with an axial fiber tip (7.63 ± 1.22 MPa) and the lowest was achieved with a radial fiber tip in the glass fiber group (6.98 ± 0.96 MPa)
Summary
Is in vitro study was designed to evaluate the influence of an Er,Cr:YSGG laser on the bond strength of zirconia and glass fiber posts with root dentin. E highest mean push-out bond strength of the glass fiber and zirconia groups was achieved with laser treatment. E mean push-out bond strength was found to be higher with an axial fiber tip for both cervical and apical segments in the glass fiber and zirconia groups (p < 0.05). E independent t-test resulted in the overall highest mean push-out bond strength in the apical segments (p 0.026). Within the limits of the present in vitro research study, an enhancement in the push-out bond strength of resin cement, mainly in the cervical region of the root canal, was achieved after irradiation with an Er,Cr:YSGG laser using an axial fiber tip
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