Effects of a new 4-acryloxyethyltrimellitic acid in a visible light-cured dental adhesive on adhesion and polymerization reactivity

✍ Scribed by Kunio Ikemura; Takeshi Endo

• Publisher: John Wiley and Sons
• Year: 1998
• Tongue: English
• Weight: 402 KB
• Volume: 69
• Category: Article
• ISSN: 0021-8995
• DOI: 10.1002/(sici)1097-4628(19980808)69:6<1057::aid-app2>3.0.co;2-f

✦ Synopsis

A new adhesive-promoting monomer, 4-acryloxyethyltrimellitic acid (4-AET), was synthesized. The effects on the adhesion to bovine dentin and the polymerization reactivity [the inclusion varying from 0 to 10 wt % 4-AET of the experimental light-cured dental bonding resins (adhesive), wherein the adhesives were aged artificially at 50ЊC over 2 weeks] were investigated, using tensile and shear bond testing, a differential scanning calorimeter (DSC), and a scanning electron microscope (SEM). Tensile and shear bond strengths to ground dentin were not significantly decreased in 4-AET content over 2 weeks of aging, and the optimum concentration of 4-AET was found to be 5 wt %. The correlation between the tensile and shear bond strengths to the dentin was highly positive (r Å 0.8517-0.9329) during the 2 weeks. The maximum temperature ( T max ) of the polymerization in DSC was affected by the 4-AET content in the positive correlation. The correlation between the T max and the bond strength to dentin was highly positive ( r Å 0.8995-0.9644). The SEM study showed that the bonding resin appeared to adhere strongly to ground dentin without the formation of resin-tags in the dentinal tubules. It was suggested that the bonding strength was attributable to the degree of penetration of the 4-AET/HEMA primer into the dentin and the polymerization reactivity of the bonding resin comprising 4-AET.