Physical, Mechanical And Environmental Properties Of Denture Base Poly(Methyl Methacrylate) Filled With Hydroxyapatite
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Date
2011-07
Authors
Mohamed Aldabib, Jamal Moammar
Journal Title
Journal ISSN
Volume Title
Publisher
Universiti Sains Malaysia
Abstract
In the field of dental materials, poly(methyl methacrylate) PMMA resin
maintains itself to be the most popular and suitable material for the fabrication of
denture bases in removable prosthodontics. However, the fracture of acrylic denture base
occurs intra-orally because of the stress intensification which is subjected during the
function or when the dentures are accidentally dropped on a hard surface. In this study,
the incorporation of hydroxyapatite ceramic (HA) powder into PMMA was carried out
in order to find out the effect of HA incorporation on the physical, mechanical and
environmental properties of the acrylic denture base. This is as well as investigating the
effect of some other factors which are considered key factors in determining the overall
properties of the composite, i. e. effect of physical mixing as a function of time, coupling
agent ratio and HA filler concentration. The HA powder was treated with different ratios
of the silane coupling agent 3-(trimethoxysily) propyl methacrylate (i. e. 0, 5, 7, and
10% by weight) with respect to the HA powder in order to evaluate the effect of
coupling agent ratio. Three different ratios (i. e. 5, 10, and 15% by weight) of the treated
filler were added into the matrix (PMMA and 0.5% BPO) to be compared with pure
PMMA and the conventional material. The powder components were mixed using the
planetary ball milling technique (PBM) for 10, 20, 30 and 40 min respectively to study
the effect of mixing time.
Description
Keywords
Denture Base Poly(Methyl Methacrylate) , Hydroxyapatite