Effects of incorporating nanosized calcium phosphate particles on properties of whisker-reinforced dental composites.

Effects of incorporating nanosized calcium phosphate particles on properties of whisker-reinforced dental composites. Research Abstract Details 

Research Abstract Table of Contents

Jump to the:

Effects of incorporating nanosized calcium phosphate particles on properties of whisker-reinforced dental composites. Abstract Text:

Hockin H K Xu,Limin Sun,Mike D Weir,Shozo Takagi,Laurence C Chow,Bernard Hockey,

Clinical data indicate that secondary caries and restoration fracture are the most common problems facing tooth restorations. Our ultimate goal was to develop mechanically-strong and caries-inhibiting dental composites. The specific goal of this pilot study was to understand the relationships between composite properties and the ratio of reinforcement filler/releasing filler. Nanoparticles of monocalcium phosphate monohydrate (MCPM) were synthesized and incorporated into a dental resin for the first time. Silicon carbide whiskers were fused with silica nanoparticles and mixed with the MCPM particles at MCPM/whisker mass ratios of 1:0, 2:1, 1:1, 1:2, and 0:1. The composites were immersed for 1-56 days to measure Ca and PO4 release. When the MCPM/whisker ratio was changed from 0:1 to 1:2, the composite flexural strength (mean +/- SD; n = 5) decreased from 174 +/- 26 MPa to 138 +/- 9 MPa (p < 0.05). A commercial nonreleasing composite had a strength of 112 +/- 14 MPa. When the MCPM/whisker ratio was changed from 1:2 to 1:1, the Ca concentration at 56 days increased from 0.77 +/- 0.04 mmol/L to 1.74 +/- 0.06 mmol/L (p < 0.05). The corresponding PO4 concentration increased from 3.88 +/- 0.21 mmol/L to 9.95 +/- 0.69 mmol/L (p < 0.05). Relationships were established between the amount of release and the MCPM volume fraction v(MCPM) in the resin: [Ca]= 42.9 v(MCPM) (2.7), and [PO4] = 48.7 v(MCPM) (1.4). In summary, the method of combining nanosized releasing fillers with reinforcing fillers yielded Ca- and PO4-releasing composites with mechanical properties matching or exceeding a commercial stress-bearing, nonreleasing composite. This method may be applicable to the use of other Ca-PO4 fillers in developing composites with high stress-bearing and caries-preventing capabilities, a combination not yet available in any dental materials.

Effects of incorporating nanosized calcium phosphate particles on properties of whisker-reinforced dental composites. Publishing Authors By Initials

HH Xu,L Sun,MD Weir,S Takagi,LC Chow,B Hockey,

For similar biomechanics: tensile strength research abstracts see: biomechanics: tensile strength research

PUBMED ID PMID:

MEDLINE DATE:

Effects of incorporating nanosized calcium phosphate particles on properties of whisker-reinforced dental composites. Journal Published:

PUBLICATION TYPE: Research Support, U.S. Gov't,

Journal: Journal of biomedical materials research. Part B,

VOLUME: 81

Page Numbers: 116-25

Journal Abbreviation: J. Biomed. Mater. Res. Part B

ISSN: 1552-4973

DAY: 3

MONTH: Apr

YEAR: 2007

Effects of incorporating nanosized calcium phosphate particles on properties of whisker-reinforced dental composites. Information

Number of References:

LANGUAGE: eng

NlmUniqueID: 101234238

Effects of incorporating nanosized calcium phosphate particles on properties of whisker-reinforced dental composites. Keywords Mesh Terms:

KEYWORDS: Tensile Strength

MESH TERMS: chemistry

Chemical & Substance for Abstract: Effects of incorporating nanosized calcium phosphate particles on properties of whisker-reinforced dental composites. Information

Substance Name: silicon carbide

Registry Number: 409-21-2

Grant and Affiliation Information for Effects of incorporating nanosized calcium phosphate particles on properties of whisker-reinforced dental composites.

AFFILIATION: Paffenbarger Research Center, American Dental Association Foundation, Gaithersburg, Maryland 20899, USA. hockin.xu@nist.gov

Country: United States

AGENCY: United States NIDCR

GRANT: R01 DE14190

ACRONYM: DE

MEDLINETA: J Biomed Mater Res B Appl Biom

REFSOURCE:

DATABASENAME:

ACCESSION NUMBER:

Number Hits: 0

Effects of incorporating nanosized calcium phosphate particles on properties of whisker-reinforced dental composites Related Publications

• District nursing sister attached to hospital surgical department.
• Effects of incorporating nanosized calcium phosphate particles on properties of whisker-reinforced dental composites.
• From theory to practice: commentary on Bartlett (1962).
• Management of acute stroke in the elderly: preliminary results of a controlled trial.
• Mixed urinary incontinence: continuing to confound?
• [Research in the nursing field]