ISSN:
1365-2842
Source:
Blackwell Publishing Journal Backfiles 1879-2005
Topics:
Medicine
Notes:
summary The polymethylmethacrylate (PMMA) resins containing γ-methacryloxypropyltrimethoxysilane (γ -MPS) of 0, 2, 4, 6, 10, 15, 20 and 30 mo1%, added to methylmethacrylate, were prepared using a monomer–polymer technique and stored in air or water at 37 ± 0·5 °C for 28 days. The flexural strength and flexural modulus of the PMMA resins containing γ -MPS of 20 and 30 mo1% were significantly smaller than those containing 2–6 mo1% and the same statements were true for the adhesive strength to porcelain tooth. However, its value of adhesive strength to Co–Cr alloy was remarkably less than to porcelain tooth. By contrast, there was no significant difference among the Knoop hardness of the PMMA resins examined. On the other hand, the thermal expansion had an increasing tendency with an increase of a γ -MPS content. The dynamic shear modulus within a temperature measured (20–140 °C) decreased s1ightly as the γ -MPS content of the PMMA resins increased, and the peak temperature of mechanical loss tangent also tended to decrease. These results indicated that the PMMA resin containing γ -MPS of 6 mol% was the best composition from the standpoint of an excellent adhesive strength against porcelain, although its water absorption was 1·9 times that of PMMA.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1111/j.1365-2842.2004.01043.x
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