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US 4,259,117 AGranted
Dental filling material
AssigneeKuraray Co., Ltd.
InventorsJunichi Yamauchi, Eiichi Masuhara, Nobuo Nakabayashi, Kyoichiro Shibatani, Tooru Wada
Life of this patent
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Abstract
A dental filling agent is provided, which contains a phosphoric or phosphonic acid ester compound containing at least one polymerizable functional group and either a group of the formula ##STR1## or a group of the formula ##STR2## or a high molecular weight compound obtainable by polymerizing the compound either alone or as a comonomer unit. This agent has a high bonding affinity for the tooth and enjoys prolonged stability in wet environments.
Claims10
A dental filling material of improved affinity for the tooth, consisting essentially of:
- (1) an acrylic or methacrylic acid ester compound,
- (2) a curing agent and (3) a dentally acceptable filler as a mixed material in combination with a phosphoric and/or phosphonic acid ester compound selected from the group consisting of compounds of formulas (A), (B), (C), (D), (E) and (F) in an amount of 2 to 50 weight percent based on said acrylic or methacrylic acid ester compound, said formulas being:
- ##STR34## wherein Ra, Ra', Ra" and Ra'" are hydrogen or methyl;
- Rb, Rb', Rb" and Rb"' are ##STR35## wherein m is an integer of 1 to 5 or ##STR36## wherein l is an integer of 1 to 3;
- Y is a hydrocarbon residue containing 1 to 30 carbon atoms, which residue may be substituted by hydroxyl, alkoxy or halogen;
- Rc and Rc' are X or OX where X is a hydrocarbon residue containing 1 to 30 carbon atoms, which may be substituted by hydroxyl, halogen, amino or carboxyl;
- ##STR37## where Z has the same meaning as X, and ##STR38##
4 more elements
Dependencies are inferred from the claim text.