J Adv Prosthodont.  2018 Jun;10(3):177-183. 10.4047/jap.2018.10.3.177.

Microtensile bond strength of resin cement primer containing nanoparticles of silver (NAg) and amorphous calcium phosphate (NACP) to human dentin

Affiliations
  • 1Department of Restorative and Cosmetic Dentistry, School of Dentistry, Bojnord University of Medical Sciences, Bojnord, Iran.
  • 2Dental Research Center, Mashhad University of Medical Sciences, Mashhad, Iran. Mohammadipourh@mums.ac.ir
  • 3Department of Restorative and Cosmetic Dentistry, School of Dentistry, Mashhad University of Medical Sciences, Mashhad, Iran.
  • 4Postgraduate Student of Mashhad University of Medical Sciences, Mashhad, Iran.

Abstract

PURPOSE
The purpose of the current study was to evaluate the effect of incorporating nanoparticles of silver (NAg) and amorphous calcium phosphate (NACP) into a self-etching primer of a resin cement on the microtensile bond strength of dentin, regarding the proven antibacterial feature of NAg and remineralizing effect of NACP.
MATERIALS AND METHODS
Flat, mid-coronal dentin from 20 intact extracted human third molars were prepared for cementation using Panavia F2.0 cement. The teeth were randomly divided into the four test groups (n=5) according to the experimental cement primer composition: cement primer without change (control group), primer with 1% (wt) of NACP, primer with 1% (wt) of physical mixture of NACP+Nag, and primer with 1% (wt) of chemical mixture of NACP+Nag. The resin cement was used according to the manufacturer's instructions. After storage in distilled water at 37℃ for 24 h, the bonded samples were sectioned longitudinally to produce 1.0 × 1.0 mm beams for micro-tensile bond strength testing in a universal testing machine. Failure modes at the dentin-resin interface were observed using a stereomicroscope. The data were analyzed by one-way ANOVA and Tukey's post-hoc tests and the level of significance was set at 0.05.
RESULTS
The lowest mean microtensile bond strength was obtained for the NACP group. Tukey's test showed that the bond strength of the control group was significantly higher than those of the other experimental groups, except for group 4 (chemical mixture of NACP and NAg; P=.67).
CONCLUSION
Novel chemical incorporation of NAg-NACP into the self-etching primer of resin cement does not compromise the dentin bond strength.

Keyword

Amorphous calcium phosphate; Bond strength; Nanoparticles; Resin cements; Silver

MeSH Terms

Calcium*
Cementation
Dentin*
Humans*
Molar, Third
Nanoparticles*
Resin Cements*
Silver*
Tooth
Water
Calcium
Resin Cements
Silver
Water

Figure

  • Fig. 1 XRD pattern of calcinated ACP sample. The peaks show the hydroxyapatite and tricalcium phosphate (Ca3(PO4)2) phases produced from dry gel containing amorphous calcium phosphate compound after heat treatment. HA: hydroxyapatite, TCP: tricalcium phosphate.

  • Fig. 2 XRD pattern of calcinated ACP/Ag sample. On this XRD spectrum, in addition to hydroxyapatite and calcium phosphate (Ca3(PO4)2) phases, a tricalcium phosphate phase combined with a silver phase (AgCa10(PO4)7) was produced.

  • Fig. 3 Particle size distribution of ACP sample.

  • Fig. 4 Particle size distribution of ACP/Ag sample.


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