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Ultrasonic measurement of the effects of light irradiation and presence of water on the polymerization of self‐adhesive resin cement
Author(s) -
Takenaka Hirotaka,
Ouchi Hajime,
Sai Keiichi,
Kawamoto Ryo,
Murayama Ryosuke,
Kurokawa Hiroyasu,
Miyazaki Masashi
Publication year - 2015
Publication title -
european journal of oral sciences
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.802
H-Index - 93
eISSN - 1600-0722
pISSN - 0909-8836
DOI - 10.1111/eos.12205
Subject(s) - materials science , composite material , polymerization , adhesive , irradiation , elastic modulus , cement , ultrasonic sensor , polymer , acoustics , physics , layer (electronics) , nuclear physics
Self‐adhesive resin cements are useful in restorations because they reduce the number of clinical steps involved in the restoration process. This study evaluated, using ultrasonic measurements, the influence of light irradiation and the presence of water on the polymerization behavior and elastic modulus of a self‐adhesive resin cement. A self‐adhesive resin cement ( R ely X U nicem 2 A utomix) or a resin cement ( R ely X ARC ) was inserted into a transparent mold on a sample stage, and the presence of water and effect of light‐irradiation were evaluated. The transit time of a sonic wave through the cement disk was divided by the specimen thickness to obtain the sonic velocity, and longitudinal and shear waves were used to determine the elastic modulus. When the resin cements were light‐irradiated, the sonic velocity rapidly increased and plateaued at 2,500–2,700 m s −1 . When the cements were not irradiated, the rates of increase in the sonic velocity were reduced. When water was applied to the sample stage, the sonic velocity was reduced. The elastic modulus values of the specimens ranged from 9.9 to 15.9 GPa after 24 h. The polymerization behavior of self‐adhesive resin cements is affected by the polymerization mode and the presence of water.