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Effects of phosphoric acid and tannic acid on dentine collagen
Author(s) -
OKAMOTO Y.,
HEELEY J.D.,
DOGON I.L.,
SHINTANI H.
Publication year - 1991
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.1365-2842.1991.tb00073.x
Subject(s) - phosphoric acid , tannic acid , chemistry , enamel paint , denaturation (fissile materials) , composite number , dentistry , biochemistry , nuclear chemistry , materials science , composite material , organic chemistry , medicine
Summary We examined the effects of phosphoric acid, the most common enamel etchant in composite resin therapy, on dentine collagen. Dentine collagen pretreated with 7 M phosphoric acid was shown to be more susceptible to trypsin digestion than untreated collagen. This susceptibility increased with increasing duration of exposure to the acid. The results indicate that phosphoric acid induces a conformational change in dentine collagen (denaturation or perturbation) similar to that observed with 0.39 M HCI, which has a similar pH value (0.65). However, phosphoric acid‐pretreated dentine collagen, when treated with tannic acid for 2 h, became as resistant to tryptic digestion as intact dentine collagen. The present results suggest that tannic acid may work as a dentine conditioner in composite resin therapy, in view of the fact that phosphoric acid etchant is applied, either deliberately or inadvertently, to dentine, and would thus induce denaturation or perturbation of collagen.