Comparison of a recently developed nanofiller self-etching primer adhesive with other self-etching primers and conventional acid etching

Abstract

The purpose of this ex vivo study was to compare the bond strengths and modes of failure of brackets bonded with three self-etching products [Adper Prompt L-Pop (3M Espe), Futurabond NR (Voco) and Transbond Plus (3M Unitek)] and a conventional 38 per cent phosphoric acid-etching system Etch-Rite (Pulpdent Corp.) at two different time points. Ninety-six defect-free premolars were randomly allocated to eight groups (n = 12). The etching procedure was carried out according to the manufacturers' instructions. The shear bond strengths (SBSs) were measured after storage in distilled water for 12 and 24 hours. The brackets were debonded using a universal testing machine with a cross-head speed of 0.5 mm/minute. Multiple comparisons of the SBSs for the different etching types were performed using analysis of variance. The chi-square test was used to evaluate differences in adhesive remnant index (CARI) scores among the groups. The differences between SBSs analysed at 12 and 24 hours were not significantly different. Although a significant difference (P < 0.01) was observed with conventional and self-etching primer (SEP) adhesive systems, SEP revealed bond strengths higher than clinically accepted limits (6-8 MPa). SEP systems can achieve successful orthodontic bond strengths. The rate of development of the bond strength must be determined to ensure sufficient maturation of orthodontic adhesives before functional loading.

Effect of nanotechnology in self-etch bonding systems on the shear bond strength of stainless steel orthodontic brackets

“…Previous studies 25 , 26 found that the shrinkage of polymerization was affected by the filler content, and another study 7 indicated that greater shrinkage was produced by smaller nanofillers size, which leads to decreased bond strength of self-etch bonding systems.…”

“…Nanoparticles (NPs) of various composition represent the most widespread use of nanotechnology in dentistry 7 . Incorporated nanofillers in adhesives compositions increased resistance against fracture and wear, provided higher dimensional stability and produced higher SBS than conventional adhesives 20 .…”

“…The development of dental material sciences has introduced nanotechnology in bonding systems 7 . Nanotechnology or molecular nanotechnology is the production of functional structures and materials in the length scale of approximately 0.1-100 nanometers (1 nm = 10 -9 m) by various physical or chemical methods 8 .…”

Classification review of dental adhesive systems: from the IV generation to the universal type

“…In the new agents, the addition of nano-fillers with an average particle size of 12 nm increases the penetration of resin monomers and the hybrid layer thickness, which in turn improves the mechanical properties of the bonding systems (42,43). Nano-bonding agents are solutions of nano-fillers, Classification review of dental adhesive systems: from the IV generation to the universal type @ C I C E d i z i o n i I n t e r n a z i o n a l i which produce better enamel and dentin bond strength, stress absorption, and longer shelf life (24).…”

“…These new agent from self-etch generations have an acidic hydrophilic monomers and can be easily used on the etched enamel after contamination with saliva or moisture (44). Based on the manufacturer, nano-particles acting as crosslinks, will reduced the dimensional changes (42,43). The type of nano-fillers and the method that these particles are incorporated affect the adhesive viscosity and penetration ability of the resin monomers into collagen fibers spaces (43).…”