Skip to main content
U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Systematic Variation of Interfacial Phase Reactivity in Dental Nanocomposites



K S. Wilson, K Zhang, Joseph M. Antonucci


The goal of this study was to determine the effect of varying the chemistry of the interfacial phase on critical composite properties in dental nanocomposite materials. Silica nanoparticles were silanized with varying ratios of 3-methacryloxypropyltrimethoxysilane (MPTMS) and octyltrimethoxysilane (OTMS) while keeping the amount of total silane constant at 10 % by mass. The nanoparticles (60 % by mass) were mixed into a dimethacrylate resin. The composites were photo-cured and tested by biaxial flexure and three point bend flexure testing. Fracture surfaces were analyzed by field-emission scanning electron microscopy (FE-SEM). In formulating the composite pastes, the maximum mass fraction of silanized silica that could be successfully mixed into the resin increased as the fraction of OTMS on the silica increased relative to MPTMS, suggesting improved processability compared to those silanized with only MPTMS.The flexure strengths and moduli of the dual silanized composites were similar up to 5 % OTMS but decreased as OTMS fractions in the silane mixture increased to 7.5 % and 10 %. FE-SEM images revealed evidence for phase separation in the composites containing silica silanized with high fractions of OTMS. Generally, nanocomposites filled with dual silanized (MPTMS and OTMS) silica nanoparticles had mechanical properties comparable to nanocomposites filled with MPTMS-silanized nanoparticles. Among the practical benefits of dual silanized nanoparticles were the improved processability of composite pastes and higher filler loadings tha should lead to lower cure shrinkage.
No. 25


composite, dental restorative material, mechanical properties, nanoparticle, siland, surface treatment


Wilson, K. , Zhang, K. and Antonucci, J. (2005), Systematic Variation of Interfacial Phase Reactivity in Dental Nanocomposites, Biomaterials, [online], (Accessed May 26, 2024)


If you have any questions about this publication or are having problems accessing it, please contact

Created September 1, 2005, Updated February 17, 2017