Effects of DCPA Nano-Particle Filler Level on Ca-and-PO4- Releasing Dental Composites

Published

January 1, 2007

Author(s)

Hockin D. Xu, Michael Weir, Limin Sun, S. Takagi, Laurence C. Chow

Abstract

Dicalcium phosphate anhydrous (DCPA) nano-particles were recently synthesized. The objective of this study was to investigate the effects of filler level on composite mechanical properties and Ca and PO4 release. Nano DCPA and whiskers were used at DCPA:whisker mass ratio of 1:1. The filler mass fractions in the resin ranged from 0 % to 75 %. Flexural strengths (mean sd; n = 6) of the DCPA-whisker composites ranged from (106 39) MPa at 0 % fillers to (114 23) MPa at 75 % fillers, not significantly different from (112 22) MPa of a non-releasing composite (TPH) (p > 0.1). The composite with 75 % fillers yielded a Ca concentration of (0.65 0.02) mmol/L and PO4 of (2.29 0.07) mmol/L at 56 d. At 40 % to 75 % fillers, the composite solutions were supersaturated with respect to hydroxyapatite. Relationships were established between release and DCPA volume fraction in the resin vDCPA: Ca = 4.46 vDCPA1.6, and PO4 = 66.9 vDCPA2.6, indicating that the release increases with vDCPA at a rate faster than being linear. In conclusion, nano DCPA-whisker composites had high strengths and released Ca and PO4 that were supersaturated with respect to hydroxyapatite. They may be useful in stress-bearing and remineralizing restorations.

Citation

Journal of Dental Research

Volume

86

Issue

4

Pub Type

Journals

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Keywords

Ca and PO4 ion release, dental composite, nano particles, remineralization, whisker reinforcement

Citation

Xu, H. , Weir, M. , Sun, L. , Takagi, S. and Chow, L. (2007), Effects of DCPA Nano-Particle Filler Level on Ca-and-PO_4- Releasing Dental Composites, Journal of Dental Research, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=852595 (Accessed October 27, 2025)