期刊
JOURNAL OF BIOMEDICAL MATERIALS RESEARCH PART B-APPLIED BIOMATERIALS
卷 65B, 期 2, 页码 252-261出版社
WILEY
DOI: 10.1002/jbm.b.10559
关键词
maxillofacial prosthesis; poly(dimethylsiloxane); tear strength; hardness; molecular weight between the cross links
Maxillofacial prosthetic materials are used to rehabilitate patients suffering from acquired or congenital facial disfigurement. Silicone rubber materials [poly(dimethylsiloxane) rubbers] are the materials of choice. However, current formulations have inadequate mechanical properties, in particular, tear strength. The purpose of this study was to formulate a new poly(dimethylsiloxane) material with improved mechanical properties in comparison to commercially available materials. The formulations developed were based on condensation chemistry containing a hydroxy-end-blocked poly(dimethylsiloxane), hydrophobic silica filler, silane cross-linking agents, and a tin catalyst. The following parameters were varied in order to formulate improved materials: (a) bimodal polymeric mix (i.e., ratio of high- and low-molecular-weight polymers); (b) silica filler type and quantity. By varying these parameters a formulation was developed with a base polymer mix of 80%:20% high- to low-molecular-weight polymers into which 20% w/w filler was added. This formulation had a tear strength of 22.23 +/- 1.6 m N/mm compared to the commercial materials having tear strengths in the range 4.53-17.63 N/mm. (C) 2003 Wiley Periodicals, Inc.
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