Linked Life Data

19409868

Source:http://linkedlifedata.com/resource/pubmed/id/19409868

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
7
pubmed:dateCreated
2009-8-25
pubmed:abstractText
Poly(methyl methacrylate) (PMMA) remains the most common bone substitute material used for vertebroplasty. A possible downside with this material is that the Young's modulus of the cement is significantly higher than that of osteoporotic vertebral cancellous bone. In consequence, an increased fracture risk has been demonstrated for the adjacent vertebral bodies after reinforcement. A solution could be to prepare porous bone cements with a lower bulk modulus as suggested by De Wijn (De Wijn JR. Poly(methyl methacrylate)-aqueous phase blends: in situ curing porous materials. J Biomed Mater Res 1976;10:625-35). The potential of such porous PMMA cements for application in vertebroplasty has been shown in the literature. The present study was performed to study the release of particles, e.g. powder particles such as barium sulfate or hydroxyapatite, from PMMA cements containing an aqueous phase. The aqueous phase was introduced to act as a pore-forming phase to soften the cement and is thought to be released when applied in vivo. Cement particle release is not suitable for the application as they may cause adverse reactions such as embolism. The purpose of the present study was to investigate the amount of the particles released in relation to various aqueous solutions and different preparation methods. As a result of the work presented here, a method was found to reduce the particle release by delayed admixing of the aqueous phase to the partially polymerized PMMA/MMA mixture. This method leads to a reduction in particle release of more than 50%, e.g. reduced from 1.3 to 0.6g particles per 4ml of cement. Despite these improvements, particle release could not be reduced to a suitable level comparable to regular vertebroplasty cement. Therefore, the practicability of the initially promising invention of porous PMMA, in order to make regular PMMA cement more compliant with cancellous bone remains an unsolved issue.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Sep
pubmed:issn
1878-7568
pubmed:author
pubmed:issnType
Electronic
pubmed:volume
5
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
2503-7
pubmed:meshHeading
pubmed:year
2009
pubmed:articleTitle
Evaluation of the particle release of porous PMMA cements during curing.
pubmed:affiliation
R&D Biomaterials, Synthes GmbH, Eimattstrasse 3, 4436 Oberdorf, Switzerland. beck.stefan@synthes.com
pubmed:publicationType
Journal Article, Evaluation Studies