fulltext.study @t Gmail

Zinc-based glass polyalkenoate cements with improved setting times and mechanical properties

Paper ID Volume ID Publish Year Pages File Format Full-Text
1853 92 2008 7 PDF Available
Title
Zinc-based glass polyalkenoate cements with improved setting times and mechanical properties
Abstract

The suitability of glass polyalkenoate cements (GPCs) for skeletal applications is limited by the presence, in the glass phase, of the aluminium ion (Al3+), a neurotoxin. The zinc ion (Zn2+), a bacteriocide, has been incorporated into aluminium-free GPCs based on zinc silicate glasses. However, these GPCs have considerably shorter working times and poorer mechanical properties than their Al3+-containing counterparts. Based on results for calcium phosphate cements, there is an indication that mixing a GPC with an organic compound, tricalcium citrate (TSC), may lead to cements with improved rheological and mechanical properties. We developed a range of Zn-based GPCs and determined their working times (Tw), setting times (Ts), compressive strength (CS) and biaxial flexural strengths (BFS). A GPC composed of 1 g of a calcium–zinc silicate glass (BT100) mixed with a 50 wt.% aqueous solution on polyacrylic acid (coded E9, Mw 80,800) at a powder liquid ratio of 2:1.5 exhibited the best combination of Tw, Ts, CS and BFS. We also found that the addition of TSC (over the range 5–15 wt.%) to a GPC led to significant increases in both Tw (from 40 ± 3 to 100 ± 4 s) and Ts (from 70 ± 2 to 3000 ± 4 s) accompanied by changes in both CS and BFS that were affected by the duration of the aging time of the specimens in distilled water (for example, after aging for 7 days CS dropped from 62 ± 2 to 17 ± 1 MPa, while after aging for 30 days, BFS increased 27 ± 6 to 31 ± 7 MPa and then dropped to 17 ± 1 MPa). Future modification and characterization of the examined GPCs are needed before they may be considered as candidates for orthopaedic applications.

Keywords
Glass polyalkenoate cements; Trisodium citrate; Mechanical properties
First Page Preview
Zinc-based glass polyalkenoate cements with improved setting times and mechanical properties
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us
Publisher
Database: Elsevier - ScienceDirect
Journal: Acta Biomaterialia - Volume 4, Issue 2, March 2008, Pages 425–431
Authors
, , , ,
Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us