𝔖 Bobbio Scriptorium
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Creep of conventional and microfilled dental composites

✍ Scribed by Papadogianis, Yannis ;Boyer, Daniel B. ;Lakes, Roderic S.

Book ID
102291062
Publisher
John Wiley and Sons
Year
1984
Tongue
English
Weight
447 KB
Volume
18
Category
Article
ISSN
0021-9304

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✦ Synopsis

The creep of microspecimens of two conventional and two microfilled composites was studied using a torsional creep apparatus. Small stresses below the materials' proportional limits were maintained for 3 h and recovery was monitored for 30 h. Creep curves were obtained at 21.5,37, and 50Β°C, and three torque levels. The composites exhibited linear viscoelastic behavior at low deformations. The magnitude of creep depended on the amount and type of resin in the composites. The materials did not recover their original shape after 30 h after the stress was removed. No transitions were observed in the temperature range employed. The shear moduli decreased with temperature and are in reasonable agreement with literature values obtained with other tests. spectra of the composites were 35-55% lower than those of human dentin (55,100 psi).

Whiting and Jacobsen3 measured the dynamic shear modulus and the mechanical damping of seven resin-filling materials in the temperature range 20-60Β°C using the torsion pendulum. The highly filled composites had a very

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