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Effect of initiator concentration, exposure time and particle size of the filler upon the mechanical properties of a light‐curing radiopaque dental composite
Author(s) -
Krishnan V. Kalliyana,
Yamuna V.
Publication year - 1998
Publication title -
journal of oral rehabilitation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.991
H-Index - 93
eISSN - 1365-2842
pISSN - 0305-182X
DOI - 10.1046/j.1365-2842.1998.00308.x
Subject(s) - ultimate tensile strength , composite material , filler (materials) , indentation hardness , materials science , dental composite , curing (chemistry) , composite number , particle size , compressive strength , particle (ecology) , chemistry , microstructure , oceanography , geology
Concentration of camphorquinone initiator, exposure time of the light source and particle size of a radiopaque glass filler have been varied for an indigenously developed light‐curing dental composite and the changes in the microhardness, compressive strength and diametral tensile strength studied. Higher initiator concentration and exposure times are found to improve the microhardness values while a concentration above 0·25% does not signify any drastic improvement in compressive and diametral strength. Changes in properties are found to be statistically significant at low initiator concentrations. A filler particle size around 1 μm is found to give better properties compared with larger sizes.