Patent Application
20110070555
1. Field of the Disclosure
The disclosure relates in general to matrix bands for dental applications, and more particularly, to a matrix band which is coated with a combination of polymers to provide enhanced properties.
2. Background Art
The use of matrix bands during tooth restoration is well known in the art. Matrix bands are typically positioned about a tooth during restoration. The matrix band provides an artificial wall when applying a filling material. One such band is often referred to as a Tofflemire band. Such a band comprises a stainless steel sheet that is positioned around a tooth. A tool, such as a band retainer is utilized to maintain the band in position. In other applications, smaller, shaped bands are utilized. One such band is shown in U.S. Pat. No. 5,788,487 issued to Meyer.
Inasmuch as the tooth restoration materials are designed to adhere to teeth, it is important to minimize the adhesion of the materials to the matrix bands. For this reason, a number of different materials and coatings have been applied to matrix bands to limit adhesion to the underlying tooth restoration resins. Among other coatings, particular metals and alloys, such as gold or tin, have been applied to the underlying stainless steel material. One such disclosure is seen in U.S. Pat. No. 6,749,429 issued to Haraden et al.
While certain references have identified the use of fluorocarbons (i.e. PTFE), problems have been identified. For example, U.S. Pub. No. 2009/0142725 has identified the use of fluorocarbons in association with dental matrix bands. However, others have attempted to utilize fluorocarbons in association with matrix bands without success. While fluorocarbons can be coated upon a base material, use in a matrix band results in de-lamination and scraping off of the fluorocarbon material. One such test is described in the above-described '429 patent at Example Six and Example Seven in Column 4 thereof.
The same has been observed through testing, with de-lamination occurring about the perimeter of the matrix band. In addition, such de-lamination only increases with shaped matrix bands. Thus, conventionally applied fluorocarbon materials have been found to be unsuitable for coating matrix bands.
It has been found that particular combinations of polymers, however, can yield coatings that are suitable for use in association with dental applications and matrix bands. Specifically, coatings comprising a combination of fluorinated ethylene propylene, polytetrafluoroethylene and polyether sulfone are suitable for use in association with matrix bands.
Thus, the present disclosure is directed to matrix bands for dental applications wherein the matrix band includes a base material and a coating. The base material has an outer surface and a tooth contact surface. The base material additionally defines a perimeter. The coating is applied to the tooth contact surface so as to extend to the perimeter thereof. The coating comprises a combination of fluorinated ethylene propylene, polytetrafluoroethylene and polyether sulfone.
In a preferred embodiment, the base material comprises a stainless steel.
In another preferred embodiment, the base material is selected from the group consisting of: polymers, metals and alloys thereof.
In another preferred embodiment, the base material has a base thickness, the base thickness is between 0.001 inches and 0.003 inches.
Preferably, the coating has a coating thickness which is between 0.00015 inches and 0.0006 inches.
In certain embodiments, the base material comprises a inwardly concave configuration which is stamped after the coating is applied to the tooth contact surface.
In other embodiments, the coating further includes a pigment selected from a number of pigments so as to allow for differentiation of matrix band properties based upon color.
In another aspect of the invention, the invention comprises a method of manufacturing a matrix band for dental applications comprising the steps of: (a) providing a base material; (b) coating the base material with a coating comprising fluorinated ethylene propylene, polytetrafluoroethylene and polyether sulfone; and (c) forming the base material into a desired configuration.
In a preferred embodiment, the step of coating comprises the steps of: (a) applying the coating to the base material; and (b) curing the coating onto the base material.
In another preferred embodiment, the step of coating further comprises the step of applying a coating to the base material in a thickness of between 0.00015 inches and 0.0006 inches.
In yet another preferred embodiment, the step of forming further comprises the step of stamping the base material into the desired shape and size.
In another preferred embodiment, the step of forming further comprises the step of cutting the base material into the desired shape and size.
The disclosure will now be described with reference to the drawings wherein:
While this invention is susceptible of embodiment in many different forms, there is shown in the drawings and described herein in detail a specific embodiment with the understanding that the present disclosure is to be considered as an exemplification and is not intended to be limited to the embodiment illustrated.
It will be understood that like or analogous elements and/or components, referred to herein, may be identified throughout the drawings by like reference characters. In addition, it will be understood that the drawings are merely schematic representations of the invention, and some of the components may have been distorted from actual scale for purposes of pictorial clarity.
Referring now to the drawings and in particular to
Generally, and with reference to
With the embodiment of
The coating 18 is applied to the tooth contact surface 16. In the embodiment shown, the entirety of the tooth contact surface 16 is coated with the coating. Preferably, the coating extends to the entirety of the tooth contact surface to the perimeter of the base material. The coating comprises a combination of fluorinated ethylene propylene (FEP), polytetrafluoroethylene (PTFE) and polyether sulfone (PES). Surprisingly, whereas other PTFE coatings have been tried without success, it has been found that the foregoing combination of materials yields a coating that can be utilized in the foregoing application without flaking, degradation or de-lamination proximate the perimeter of the base material. This has been found to be the case even after several autoclaving cycles. Additionally, the coating of the present disclosure can be applied prior to forming the matrix bands, even wherein the matrix bands are punched into the inwardly concave configuration of the embodiment shown in
Preferably, the coating is applied through a number of different means. For example, the coating can be applied through spray or coil coating. Once applied, the coating can be cured in ovens. It is preferred that the coating be applied to a thickness of approximately between 0.00015 inches and 0.0006 inches. Additionally, a number of different pigments can be introduced into the coating so as to provide a number of different colors. The colors can be used as indicators of different properties of the respective matrix bands. Among other colors, it is contemplated that Red, Orange, White, Blue, Black, Purple, Grey, Green and Yellow can be utilized. Of course, other colors and color combinations are contemplated.
Preferably, to manufacture the matrix bands of the type shown in
The base material in sheet form with the coating applied thereto is then processed and shaped to make the final matrix bands. For the matrix bands shown in
The foregoing description merely explains and illustrates the invention and the invention is not limited thereto except insofar as the appended claims are so limited, as those skilled in the art who have the disclosure before them will be able to make modifications without departing from the scope of the invention.
