Exothermal characteristics and release of residual monomers from fiber-reinforced oligomer-modified acrylic bone cement.
The aim of this study is to determine the peak temperature of polymerization, the setting time and the release of residual monomers of a modified acrylic bone cement. Palacos R, a commercial bone cement, is used as the main component. The cement is modified by adding short glass fibers and resorbable oligomer fillers, and an additional cross-linking monomer. The test specimens are classified according to the composition of the bone cement matrix (i.e., oligomer-filler, glass-fiber reinforcement, and/or cross-linking monomer). The exothermal characteristics during autopolymerization are analyzed using a transducer connected with a computer. The quantities of residual monomers were analyzed from different test groups using high performance liquid chromatography (HPLC). The DeltaT value for the oligomer filler and the glass-fiber-containing acrylic bone cement is lower than that for the unmodified bone cement (2.1 +/- 0.8 vs. 23.5 +/- 4.2 degrees C). The addition of a cross-linking monomer, EGDMA, shortens the setting time of the autopolymerization of the unmodified bone cement (7.1 +/- 0.9 min vs. 3.3 +/- 0.3 min). The quantity of the residual monomers released is higher in the modified bone cement than that in the unmodified cement. The cement that contains glass fibers and oligomer fillers has a considerably lower exothermal peak, whereas the total quantity of residual monomers released is increased.
Department of Prosthetic Dentistry & Biomaterials Research, Institute of Dentistry, University of Turku, Finland. mervi.puska@utu.fi
Mervi A
MA
Puska
Lippo V J
LV
Lassila
Allan J
AJ
Aho
Antti
A
Yli-Urpo
Pekka K
PK
Vallittu
Ilkka
I
Kangasniemi
D002484:Cementation / Q000379:methods*; D003432:Cross-Linking Reagents / Q000737:chemistry; D004058:Diffusion; D005898:Glass / Q000737:chemistry*; D006244:Hardness; D006358:Hot Temperature; D007700:Kinetics; D008422:Materials Testing; D019904:Polymethyl Methacrylate / Q000032:analysis* / Q000737:chemistry*; D013696:Temperature
D003432:Cross-Linking Reagents; D019904:Polymethyl Methacrylate