Drug – bio-affecting and body treating compositions – Dentifrices
Reexamination Certificate
1998-11-12
2001-11-06
Rose, Shep K. (Department: 1614)
Drug, bio-affecting and body treating compositions
Dentifrices
C433S215000, C433S216000, C433S228100, C433S229000, C433S226000, C106S035000
Reexamination Certificate
active
06312667
ABSTRACT:
FIELD OF THE INVENTION
This invention relates to dental compositions suitable for etching hard tissue having viscosities capable of responding to a change in temperature. The invention also relates to methods of etching hard tissues by applying the composition directly onto a target area of the substrate.
BACKGROUND
An etchant placed on a hard tissue will dissolve the substrate in such a way as to allow for good mechanical retention of a cured adhesive or other coating which is applied subsequent to the etching treatment. In the dental art, the use of a dental etchant is generally necessary to obtain optimal bonding of a restorative or other material to dentin or enamel. To attain proper etching at the desired location on the hard tissue, it is desirable that the etchant be controllable and slow to flow away from it target site. Thus a high viscosity etchant in the oral environment would be quite useful.
Currently available etchants are provided in seemingly extreme viscosity states. That is, there exist compositions that have very low viscosities as well as compositions that are highly thickened and therefore possess high viscosity. Those with low viscosities are difficult to control and have tendencies to flow away from the target site once it is applied. Compositions with high viscosities are difficult to extrude through a small orifice.
Certain etchant compositions may use thickeners such as fumed silica and polyvinyl alcohols. Problems encountered in using these thickeners include aging, which results in non-homogenous gels which make handling difficult, and shear thinning, which reduces the viscosity of a gel when extruded through an orifice and thinning at elevated temperatures. Thinning can result in a material that drips onto soft tissue causing irritation and damage to the tissue.
SUMMARY OF THE INVENTION
The present invention provides a dental composition suitable for etching hard tissue comprising an acid and a thermally responsive viscosity modifier, capable of undergoing an increase in viscosity in response to an increase in temperature. These compositions also preferably have the ability to reverse their viscosity upon the lowering of temperature.
Compositions of the invention work very well in the oral environment where temperature is generally higher than ambient or the pre-treatment temperature of a composition. This differential in temperature thickens the composition and thus provides a thickened, semi-solid or gel-like composition in the oral environment.
A preferred method of use of the invention comprises applying the composition directly onto the hard tissue. Upon exposure of the composition to the oral temperature, the composition thickens to a semi-solid or gel-like state.
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Oxman Joel D.
Trom Matt C.
3M Innovative Properties Company
Rose Shep K.
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