Exoskeleton support for placement of a dental treatment strip

An exoskeleton support and associated placement system for use in placing a thin, flexible dental treatment strip over a person's tooth surfaces. The exoskeleton support includes an exoskeleton body that is curved so as to approximate the curvature of a person's dental arch. The exoskeleton support includes an inner surface that is oriented toward a person's tooth surfaces during use, an outer surface oriented away from the person's tooth surfaces during use, and means for temporarily holding or attaching a flexible dental treatment strip to the inner surface of the exoskeleton support. The exoskeleton support allows a user to more easily and accurately place a dental treatment strip on tooth surfaces to be treated.

BACKGROUND OF THE INVENTION

1. The Field of the Invention

The present invention is in the field of dental treatment systems that include dental strips used in applying a dental bleach, fluoride, desensitizing agent, antimicrobial agent, anticariogenic agent, or other dental agents to a person's teeth and/or gums. More particularly, the invention relates to placement systems for placing a thin, flexible dental treatment strip over a person's tooth and/or gum surfaces.

2. The Relevant Technology

Virtually all people desire white or whiter teeth. To achieve this goal, people either have veneers placed over their teeth or have their teeth chemically bleached. In the past, people who desired to have their teeth bleached had to submit to conventional in-office bleaching techniques. The process generally involves: (1) making an alginate impression of the patient's teeth; (2) making a stone cast or model of the impression; (3) vacuum forming a dental tray from the model, usually from a sheet of thin ethyl vinyl acetate (EVA) material, and trimming to exclude gingival coverage. This method results in a tray that is soft and flexible and that is very accurately customized to the patient's teeth. However, the method is time consuming and the resulting tray is relatively expensive.

Because of the high cost of producing custom dental trays, less costly alternatives have been developed. One such alternative is a strip of a flexible plastic material coated with a bleaching agent that can be applied to a user's teeth. Such strips are placed against the teeth by the user to cover the labial surface of at least some of the front teeth (e.g., 6-8 teeth) and then folded back to cover the occlusal surface and possibly a portion of the lingual surfaces. Because the dental strips are often very thin and flexible, they can be awkward to place correctly. In many cases, they will fold together and self adhere or become mangled before being properly placed over a person's teeth. Because of this difficulty, replacement and refitting of the strips is often required.

In view of the foregoing, there is an ongoing need for a dental treatment system that would allow a person to more easily and accurately place a dental strip over teeth to be treated.

BRIEF SUMMARY OF THE PREFERRED EMBODIMENTS

The present invention is directed to an exoskeleton support for use in placing a thin, flexible dental treatment strip over a person's tooth surfaces. The exoskeleton support includes a curved body so as to approximate the curvature of a person's dental arch. The exoskeleton support includes an inner surface oriented toward a person's teeth during use, and an outer surface oriented away from the person's tooth surfaces during use. The exoskeleton support also includes means for temporarily holding or attaching a flexible dental treatment strip to the inner surface of the exoskeleton body. The exoskeleton support allows a user to more easily and accurately place a dental treatment strip on a tooth surface to be treated.

In one example, the exoskeleton support may further include a handle (e.g., formed on the outer surface of the exoskeleton body) that facilitates a user gripping and maneuvering the exoskeleton body during use.

The exoskeleton support may be formed of any suitable material and may be semi-rigid, rigid, or flexible. Suitable materials for making the exoskeleton body include, for example, polyurethane, an elastomer, a molded/thermoformed plastic, a shapeable plastic, closed or open cell polymeric foam, metal (e.g., stamped or formed), wire, cardboard, paraffin wax, or any other suitable material.

According to one embodiment, the means for temporarily holding or attaching a flexible dental treatment strip to the inner surface of the exoskeleton body may comprise any suitable sticky or adhesive material. Suitable examples include, but are not limited to glycerin, polyethylene glycol, an adhesive silicon, petrolatum, oils (e.g., mineral oil), a tackifying sweetener (e.g., honey), sticky polymers in water or another solvent (e.g., glycerin or a glycol), or a sticky resin.

In another example, the means for temporarily holding or attaching the flexible dental treatment strip to the exoskeleton body may comprise a static attraction (i.e., static cling) between the exoskeleton body material and the material of the dental treatment strip.

The invention also provides a placement system that includes an exoskeleton support as described above and a flexible dental treatment strip. The strip is removably attached to the inner surface of the exoskeleton body.

The flexible dental treatment strip of the placement system may include a dental treatment composition (e.g., a sticky dental bleaching composition) adjacent to an inner surface of the strip. Other dental treatment compositions may include desensitizing compositions, fluoride compositions, antimicrobial compositions, and anticariogenic compositions.

The exoskeleton support and dental treatment strip of the placement system may be conveniently pre-packaged together e.g., in a foil pouch, under a peelable cover, or in other packaging capable of keeping a dental treatment composition from drying out or otherwise being inactivated or contaminated. In order to use a pre-packaged placement system, the user removes the placement system from the packaging and places it so that the flexible dental treatment strip covers at least a portion of the user's upper or lower teeth. The exoskeleton support is used to support the treatment strip while the user maneuvers the placement system into place. Once the dental treatment strip has been placed as desired, the exoskeleton support is separated from the dental strip. Because the dental treatment strip is coated with a sticky or adhesive treatment composition, once placed over the teeth, the sticky or adhesive treatment composition holds the strip against the teeth in the absence of the exoskeleton support.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

The invention relates to exoskeleton supports and related placement systems for use in placing a thin, flexible dental treatment strip over a person's tooth surfaces. The exoskeleton support includes a curved body so as to approximate the curvature of a person's dental arch. The exoskeleton support includes an inner surface for placement against a person's tooth surfaces, and an outer surface oriented away from the person's tooth surfaces during use. The exoskeleton tray support includes means for temporarily holding or attaching a flexible dental treatment strip to the inner surface of the exoskeleton body.

The exoskeleton support and associated placement system allow a user to more easily and accurately place a dental treatment strip on a tooth surface to be treated. The inventive placement system and exoskeleton support can be used for placing a dental treatment strip used for any desired dental treatment, such as tooth bleaching, desensitizing, fluoride treatments, antimicrobial treatments, and/or anticariogenic treatments.

II. Exemplary Exoskeleton Supports and Placement Systems

FIG. 1Adepicts (in exploded view) an exemplary placement system100including an exoskeleton body102that may be used in placing a flexible dental treatment strip104over a person's teeth. The exoskeleton support body102has a curved body so as to approximate the curvature of a person's dental arch. In the illustrated embodiment the exoskeleton support body102comprises a wall106including an inner surface108for placement against a person's tooth surfaces and an outer surface110oriented away from the person's tooth surfaces during placement.

As illustrated, placement device100also includes means for temporarily holding or attaching flexible dental treatment strip104to the inner surface108of exoskeleton support body102. According to one embodiment, the means for temporarily holding or attaching dental strip104to the body102may comprise any suitable sticky or adhesive material112. Suitable examples include, but are not limited to glycerin, polyethylene glycol, an adhesive silicon, petrolatum, oils (e.g., mineral oil), tackifying sweeteners (e.g., honey), sticky polymers in water or another solvent (e.g., glycerin or a glycol), or a sticky resin.

Alternatively, the means for temporarily holding or attaching the flexible dental treatment strip may comprise a static attraction (i.e., static cling) between the material of exoskeleton support body102and the material of the dental treatment strip104.

The sticky or adhesive materials may be hydrophobic or water soluble, as desired. A hydrophobic material may more easily spread over the inner surface108of the exoskeleton body102and the adjacent surface of the dental treatment strip. A water soluble material may be more easily removed from the exposed surface of the strip, e.g., by rinsing, after placement over the teeth and removal of the exoskeleton body.

In this embodiment, exoskeleton support tray114comprises both exoskeleton body102and means for temporarily holding or attaching (e.g., sticky or adhesive material112to the body102). An exemplary exoskeleton support114is perhaps best seen inFIG. 1A, the figure illustrating placement device100in an exploded configuration.

As illustrated, exoskeleton support114may also include an optional handle116(perhaps best seen inFIG. 3). The handle116facilitates placement of the placement system100over a person's teeth by providing a structure that can be more easily gripped. It also facilitates easy removal of the exoskeleton body102once the dental treatment strip104is adhered to the person's teeth.

In one embodiment, handle116may be located at or near the top or bottom edge (depending on system orientation) of wall106. In such an arrangement, easy placement may be facilitated when the system is oriented such that the handle is disposed towards the occlusal surface of the person's teeth. This minimizes interference between the handle116and the lips of the person during placement. In order to place the system over the opposite dental arch (e.g., the bottom dental arch), the placement system may simply be flipped over so as to orient the handle towards the occlusal surface and minimize interference between the handle and the person's lips.

FIG. 1Billustrates an alternative placement system100′ that includes an exoskeleton body102, dental treatment strip104, and may include means for temporarily holding or attaching strip104to exoskeleton body102(e.g., a sticky or adhesive material). Similar to placement system100, exoskeleton body102includes a wall106and a handle116. Dental treatment strip104is attached to exoskeleton body102so that at least a portion of strip104remains unattached (i.e., hangs free) to exoskeleton body102. Such a configuration allows a user to place the system100′ over the tooth surfaces to be treated, and then fold the unattached portion of dental treatment strip104over the occlusal edge of the tooth surfaces to be treated, without first requiring removal of exoskeleton body102. Depending on the width of the unattached portion of dental strip104, this portion may be further folded to cover at least a portion of the lingual surface of the tooth surfaces to be treated.

In one embodiment, the optional handle may be located at or near the top or bottom edge (depending on system orientation) of wall106. In such an arrangement, easy placement may be facilitated when the system is oriented such that the handle is disposed towards the occlusal surface of the person's teeth. This minimizes interference between the handle and the lips of the person during placement. In order to place the system100′ over the opposite dental arch (e.g., the bottom dental arch), the placement system may simply be flipped over so as to orient the handle towards the occlusal surface and minimize interference between the handle and the person's lips.

FIG. 1Cillustrates an alternative placement system200that includes an alternative exoskeleton support body202, a dental treatment strip204, and means for temporarily holding or attaching strip204to exoskeleton body202(e.g., a sticky or adhesive material). Alternative exoskeleton support body202includes a front wall206, a bottom wall218, and a handle216. The inclusion of bottom wall218gives exoskeleton body202an “L” shaped cross section. Inclusion of bottom wall218helps retain dental treatment strip204in place by preventing disruption of the strip204as the person maneuvers the placement system200as desired. Thus, bottom wall218comprises means for temporarily holding or attaching a strip to an exoskeleton support.

In one embodiment, the optional handle may be located at or near the top or bottom edge (depending on system orientation) of front wall206. In such an arrangement, easy placement may be facilitated when the system is oriented such that the handle is disposed towards the occlusal surface of the person's teeth. This minimizes interference between the handle and the lips of the person during placement. In order to place the system200over the opposite dental arch (e.g., the bottom dental arch), the placement system may simply be flipped over so as to orient the handle towards the occlusal surface and minimize interference between the handle and the person's lips.

FIG. 1Dillustrates another alternative placement system300that includes exoskeleton support body302, a dental treatment strip304, and means for temporarily holding or attaching strip304to exoskeleton body302(e.g., a sticky or adhesive material). Exoskeleton body302includes a front wall306, a bottom wall318, a rear wall320, and a handle316. The inclusion of bottom wall318and rear wall320gives exoskeleton body302an approximate “U” shaped cross section. The relative lengths of front wall306, bottom wall318, and rear wall320may be as desired. Inclusion of bottom wall318and rear wall320help retain dental treatment strip304in place by preventing disruption of the strip304as the person maneuvers the placement system300as desired. They therefore comprise means of temporarily holding or attaching a strip to an exoskeleton support.

In one embodiment, the optional handle may be located at or near the top or bottom edge (depending on system orientation) of front wall306. In such an arrangement, easy placement may be facilitated when the system is oriented such that the handle is disposed towards the occlusal surface of the person's teeth. This minimizes interference between the handle and the lips of the person during placement. In order to place the system300over the opposite dental arch (e.g., the bottom dental arch), the placement system may simply be flipped over so as to orient the handle towards the occlusal surface and minimize interference between the handle and the person's lips.

The exoskeleton support may be formed of any suitable material. Exemplary materials include, but are not limited to polyurethane, an elastomer, molded/thermoformed plastic, a shapeable plastic, a light activated shape memory polymer, closed or open cell polymeric foam, metal (e.g., stamped or formed), wire, cardboard, paraffin wax, or any other suitable material.

Non-limiting examples of some specific suitable plastics include ultra low density polyethylene (ULDPE), low density polyethylene, ethylene-vinyl acetate (EVA) copolymer, polycaprolactone (PCL), polyethylene, polypropylene, or polyvinyl chloride (PVC). Flow additives, plasticizers, and fillers may be added as desired.

Examples of suitable ULDPE materials include various polymers sold under the general trade name Attaneg® by Dow Chemical. Another suitable ULDPE material is Exact®4041made by Exxon-Mobil Chemical. An example of a suitable EVA material is Elvax®250, available from Dupont. An example of a suitable PCL material is Capra®650from Solvoy-Interox. An example of a suitable polyethylene material, which is also a shapeable plastic, is FORTE STRIP from Sekisui Chemical Co. Ltd. An example of a suitable light activated shape memory polymer has been jointly developed by RWTH in Aachen, Germany and MIT in Cambridge, Mass. Other materials and blends useful in making exoskeleton bodies are disclosed in U.S. Pat. No. 5,769,633 to Jacobs et al., U.S. Pat. No. 5,051,476 to Uji et al., and U.S. Pat. No. 6,089,869 to Schwartz. For purposes of disclosing materials that can be made into exoskeleton bodies, the foregoing patents are incorporated herein by reference.

As illustrated inFIG. 2, a placement system according to the invention (e.g., placement system300) can be sealed within a protective package422that includes a rigid support layer424and a peelable cover426. When it is desired to use the placement system300, the peelable cover426is removed and the placement system300is removed or separated from the support layer424.

Although illustrated as packaged within a sealed package, it is to be understood that any placement system may alternatively be packaged within a plastic or foil pouch.

The placement systems according to the invention may be provided in a kit including a plurality of dental treatment strips and at least one exoskeleton body. Such a kit allows a user to reuse the exoskeleton body.

In use, both the dental bleaching strip and exoskeleton support are placed into a person's mouth so as to initially position the strip104over the person's teeth as desired. The exoskeleton may include a handle to facilitate placement and positioning within the mouth. Thereafter, the exoskeleton support is removed, leaving only the dental treatment strip within the person's mouth. Further manipulation (e.g., fine adjustments) of the strip may be performed once the exoskeleton support has been removed, if desired.

FIG. 3depicts a person using a placement system100to place a dental treatment strip over the person's teeth. The exoskeleton support temporarily maintains treatment strip in its original shape so as to facilitate placement of the strip over the person's teeth. The exoskeleton support provides an advantage over attempting to place a flexible dental treatment strip without the assistance of an exoskeleton support. Once the flexible treatment strip has been placed over the person's teeth, the exoskeleton support is removed so that only the treatment strip containing the treatment composition remains over the person's teeth.

FIG. 4illustrates a dental treatment strip104placed over the person's teeth after the exoskeleton body has been removed. The illustrated strip104has been folded over the occlusal and a portion of the lingual surface of the teeth to be treated. Whether the occlusal and lingual tooth surfaces are covered simply depends on the width and placement of the strip104. The illustrated dental treatment strip104covers the eight front teeth, although the strip could be configured to treat more or fewer teeth, as desired.