Statement Of Problem: The bonding of light-activated adhesives to root canal dentin with an additional touch-polymerization activator has been insufficiently examined.
Purpose: The purpose of this in vitro study was to investigate the effect of touch-polymerization activators and extended light-irradiation time on the microtensile bond strength (μTBS) of light-activated adhesives.
Material And Methods: Post cavities were prepared in 50 extracted mandibular premolars and bonded using Prime&Bond Universal (PBU); PBU+Self Cure Activator (SCA); Clearfil SE Bond 2 (SEB); SEB+Clearfil DC Activator (DCA); or Clearfil Universal Bond Quick ER (UBQ). After light-irradiation for 10 or 20 seconds, the post cavities were filled with dual-activated resin core materials. Eight beams were prepared per specimen and subjected to the μTBS test. The μTBS data were analyzed by using 3-way ANOVAs with the Bonferroni correction (α=.05).
Results: The 3-way ANOVAs indicated that the use of touch-polymerization activators (SCA and DCA) significantly increased the μTBS of PBU and SEB in both the coronal (P=.015) and apical (P=.001) regions. The extension of light-irradiation time to 20 seconds significantly improved their μTBS in the apical region (P<.001), but not in the coronal region (P=.09). Light-irradiation for 20 seconds increased the μTBS of UBQ significantly in the coronal region (P=.014).
Conclusions: Touch-polymerization activators improved the bond strength of light-activated adhesives to root canal dentin, especially when combined with an extended light-irradiation time.
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| http://dx.doi.org/10.1016/j.prosdent.2020.11.021 | DOI Listing |
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Article Synopsis
- This study investigates the effectiveness of hydroxyapatite-silver (HA-Ag) hybrid nanoparticles as an antibacterial agent in self-etch adhesives for dental applications, particularly in treating primary molar teeth with carious lesions.* -
- A total of 80 primary molars were divided into four groups based on the concentration of HA-Ag nanoparticles used—0%, 1%, 5%, and 10%—and their effects on microtensile bond strength (μTBS), antibacterial efficacy, and degree of conversion (DC) were assessed.* -
- Results showed that 1% HA-Ag nanoparticles provided the best balance of antibacterial properties, bond strength, and degree of conversion, while the 10% concentration
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