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Ultra‐violet absorption by two ultra‐violet activated sealantss
Author(s) -
YOUNG K. C.,
MAIN C.,
GILLESPIE F. C.,
STEPHEN K. W.
Publication year - 1978
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 - 10.1111/j.1365-2842.1978.tb01237.x
Subject(s) - absorption (acoustics) , fluorescence , attenuation coefficient , ultra violet , radiation , wavelength , seal (emblem) , materials science , penetration depth , penetration (warfare) , analytical chemistry (journal) , chemistry , optics , composite material , optoelectronics , chromatography , mathematics , physics , art , visual arts , operations research
Summary Since the ability of u.v. setting pit and fissure sealants to set in depth is dependent on the penetration of the u.v. radiation, the absorption coefficients of Nuva‐seal and Alphaseal were determined at 365 nm, the wavelength of radiation used to polymerise both materials. Nuva‐seal and Alphaseal had absorption coefficients of 0·165 mm −1 and 6·25 mm −1 , respectively. The u.v. fluorescent dye present in Alphaseal contributed 2·5 mm −1 to its absorption coefficient and the remaining absorption was due to the 5% w/w catalyst concentration present, since the basic resin had no significant absorption. Therefore Nuva‐seal may set adequately to the depths required of fissure sealants, but Alphaseal may not, unless a very high intensity u.v. source is used. A reduction in the catalyst concentration and the removal of the u.v. fluorescent dye might improve the setting characteristics of Alphaseal.