H. Baharav et al., EFFECT OF IRRADIATION TIME ON TENSILE PROPERTIES OF STIFFNESS AND STRENGTH OF COMPOSITES, The Journal of prosthetic dentistry, 77(5), 1997, pp. 471-474
Purpose. We compared the effect of irradiation time on the diametral t
ensile strength and stiffness of three visible light-cured composites.
The sensitivity of the two mechanical properties to differentiate bet
ween the materials was also investigated. Material and methods. Cylind
rical specimens of three composites were cured for 20, 40, 80, and 120
seconds (n = 10) and loaded up to failure in a diametral tensile stre
ngth test. Stiffness and diametral tensile strength values were record
ed. Results. Irradiation time significantly influenced diametral tensi
le strength (p = 0.0017) and stiffness (p = 0.0002). With the same irr
adiation times the three tested materials demonstrated no significant
difference when diametral tensile strength was studied (p = 0.31). How
ever, stiffness values did show a significant difference (p = 0.0002).
Conclusions. This study found that stiffness is more sensitive in dis
closing differences in tensile properties between the materials than d
iametral tensile strength.