# US 4,398,887 A · Dental crown assembly

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- Number: US 4,398,887 A
- Document ID: US4398887A
- Status: Granted
- Kind: A
- Application number: 06/310,803
- Filed: 1981-10-13
- Granted: 1983-08-16
- Earliest claimed: 1980-02-29
- Inventors: John W. Balde; Irvin Vine
- Web page: https://patentgrep.com/patent/US4398887A

## CPC

- A61C 5/70: Tooth crowns; Making thereof
- A61C: DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE (non-driven toothbrushes A46B; {tongue scrapers A61B17/24;} preparations for dentistry A61K6/00; preparations for cleaning the teeth or mouth A61K8/00, A61Q11/00)

## Abstract

A two piece dental crown comprises cup-shaped inner (12) and outer (16) members, the inner member being adapted to be mounted on the occlusal portion of a tooth being capped, and the outer member being adapted to be mounted on the tooth including the inner member, the side wall (18) of the outer member extending beyond the side wall (20) of the inner member and into contact with the gingival portion of the tooth. In use, the inner and outer members are rigidly bonded together in slightly spaced apart relation. In one embodiment, a stiffening member is bonded to the two members in the space therebetween.

## Claims

### Claim 1

A two-piece dental crown assembly adapted to be hand-tool shaped and conformed, in situ, to the shape of a tooth to be capped, characterized as comprising a shallow, generally cup-shaped inner member of a ductile material having one closed end adapted to be mounted on the occlusal portion of the tooth, and a deeper, generally cup-shaped outer member of a ductile material having one closed end disposed around said inner member, the side wall of the outer member being longer than that of the inner member and extending beyond the side wall of the inner member to contact and cover the side portions of the tooth when mounted on said tooth, and a bonding material between said members rigidly bonding together the closed ends thereof.

### Claim 2 (depends on 1)

An assembly according to claim 1, characterized by including a stiffening member (22) dimensioned to fit between the closed ends of the two crown members, and adapted to be bonded thereto.

### Claim 3 (depends on 2)

An assembly according to claim 2, characterized in that said stiffening member is of a mesh-like construction having a plurality of passageways therethrough.

### Claim 4 (depends on 3)

An assembly according to claim 3 in which the stiffening member is pre-impregnated with an adhesive adapted to be activated when required.

### Claim 5

A method of capping a tooth characterized by positioning a shallow, pre-formed generally cup-shaped inner member having a closed occlusal surface on the tooth to be capped and shaping the occlusal surface, disposing an outer cup-shaped member having one closed end and a greater depth than said inner member on the inner member capped tooth and shaping said outer member about said inner member and into close fitting contacting relation with the side wall of said tooth, removing and separating said members, disposing a bonding material in the base portion of said outer member, then inserting said inner member into said outer member to sandwich the bonding material therebetween, and mounting and bonding the assembled crown onto said tooth.

### Claim 6 (depends on 5)

The method of claim 5 characterized by disposing between and bonding a stiffening member (22) to the occlusal portions of said inner and outer members.

### Claim 7 (depends on 6)

The method of claim 6 characterized by using a stiffening member having a plurality of passageways therethrough, and impregnating said member with a bonding material prior to disposing it between said inner and outer members.