ISSN:
1365-2842
Source:
Blackwell Publishing Journal Backfiles 1879-2005
Topics:
Medicine
Notes:
Summary In order to investigate the thermal stability, the physical and mechanical, and dynamic viscoelastic properties of glass-fibre reinforced composite materials were measured. The G′ of the seven materials examined was within 5˙20 ± 14˙55 and 4˙50–14˙35 GPa for dry and wet specimens in air at 37 °C, respectively, and decreased with increasing temperature. The G′ values of dry specimens decreased by 7˙74–15˙4% when heated to 60 °C. The value of tan δ ranged from 0˙0102 to 0˙0295 and from 0·0181 to 0·0406 for dry and wet specimens in air at 37 °C, respectively. The coefficient of linear thermal expansion between 30 and 60 °C ranged from 0˙557 to 3˙95 × 10–5/°C. Moreover, the filler content ranged from 56˙36 to 88˙87 wt%. These results showed that the magnitudes of G′, tan δ, and the coefficient of linear thermal expansion and water absorption depend on the inorganic filler or glass-fibre content; i.e. the amount of resin matrix. Moreover, for all the materials examined, the G′ values were thermostable in the temperature range encountered in the oral cavity.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1046/j.1365-2842.2002.00887.x
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