BE1026091A1 - A COMPOSITION FOR A DENTAL PRECISION ANCHORING - Google Patents

Abstract

A precision anchor for attaching a dental prosthesis to the mouth of a patient comprising a Matrix (1) component incorporated into the removable prosthesis and a Patrix (2) component as part of a pillar in the mouth. The Matrix (1) has a bulge (1b) which makes contact with a Depression (2a) in the Contact Center (3) of the Patrix (2) for support and to reduce the total height. The Radius of the Projection (1c) of the Matrix (1) is smaller than the Radius of the Depression (2b) of the Patrix (2) and creates an Spacing (4) so that the parallel alignment of Matrixes (1) over diverging Patrixen (2) is possible, and also allows a pivotal movement between Matrix (1) and Patrix (2).

Description

A COMPOSITION FOR A DENTAL PRECISION ANCHORING

SCOPE OF THE INVENTION

This invention relates to an aid for anchoring a dental prosthesis in the mouth, commonly known as a precision anchoring. More particularly, this invention relates to components of a precision anchor for removably attaching a dental prosthesis.

The male part is attached in the mouth, typically on implants or on lanes connecting implants or on roots of teeth. A suitable female part is incorporated in the removable dental prosthesis.

The male and female component connect by means of a click mechanism to securely attach the removable dental prosthesis in the mouth.

BACKGROUND OF THE INVENTION

A spherical male component of a precision anchorage is commonly called male in the dental industry.

A widely used application of these precision anchors is that the male is part of a dental implant or is a part of a pillar that is attached in a dental implant.

Since implants often diverge, it is of utmost importance to align the female parts that are commonly called matrices parallel to each other, so that the removable dental prosthesis can be placed without fractures or abnormal wear.

It is important to the user that the precision anchorage is as small as possible to incorporate into the removable dental prosthesis without making the removable dental prosthesis susceptible to breakage or overdimensioning.

Often only two precision anchors are provided in the removable dental prosthesis. Biting forces are in that case transferred to the jaw by the precision anchoring with the pillars and by the removable dental prosthesis on the compressible soft tissues.

It is known that the underlying bone resorbs from the soft tissues. The soft tissue and bone resorption require a hinged movement between the male and the male of the precision anchor.

A typical spherical precision attachment was designed by Dr. Dalla Bona and is commercially available as DALBO by Cendres et Métaux SA in Switzerland. The spherical metal male connects removably to a matrix that is provided with slats.

The precision anchoring of DALBO has also been changed as described in EP1021999 by Cendres et Métaux SA in Switzerland. The height of this precision anchoring is often difficult to incorporate into the plastic of

BE2018 / 0136 the removable dental prosthesis and highly divergent implants make it difficult to parallelize the matrices.

Many other spherical precision anchors with a plastic matrix are available commercially. A typical embodiment is described in the US 5030094 patent of Ezio Nardi. The matrix is an elastically deformable plastic material and is encased in a rigid metal housing.

The plastic material of the matrix must have sufficient thickness to deform and click over the male. This precision anchoring is also often difficult to process in the plastic of the removable dental prosthesis due to the height and the parallel placement of the matrices on very diverging pillars.

A further development of the spherical precision anchoring is described in the WO 2015/188148 patent of Zest IP Holdings. The matrix consists of a combination of a female housing and a female insert.

The external top surface of the female insert is in contact with a central projection of the internal top surface of the female housing. The central projection creates a concave gap that extends radially along an outer circumference of the inner top surface of the housing cavity.

The male has two axially superimposed flattened spherical parts and a flattened superior aspect opposite the inner top surface of the female insert. The radius of the flattened spheroid male is complementary to the inside of the concave female insert, so that the female insert can pivot over the male part to compensate for divergent implant attachments or implants.

The concept of this precision anchoring requires a combination of two components for the matrix to achieve a pivotal motion or to compensate for diverging pillars that affect the cost and complexity for the user.

The two-component concept also requires extra height for precision fixing. The male has a hexagonal internal opening in the flat outer top surface to receive an appropriate instrument for screwing the implant attachment into the implant.

Furthermore, the central projection of the female housing is axially above the opening for the instrument in the male. Given the biting forces and the thin circumference of the upper surface of the female part, the projection is pressed into the male in the male for the instrument. This likely distortion reduces the alleged hinge property between male and female.

DETAILED DESCRIPTION OF THE INVENTION

The precision anchoring in this invention includes a male that is generally spherical and has depression at the center of the superior aspect. The precision anchoring in this invention also includes

BE2018 / 0136 a matrix that fits over the male and has a protrusion in the middle that makes contact with the center of the male's depression.

The male can be produced in metal to be incorporated into a cemented root cap. Alternatively, the male can be manufactured in a castable plastic to be incorporated into the wax of a root cap and then cast into metal with lost wax technique. Alternatively, the male may be part of a dental implant or a dental implant attachment.

The male can also be made available as a digital file for milling purposes and is included in the fixed prosthesis which is attached to the jaw of the patient. The male preferably has a diameter of 2.25 mm and has a depression in its superior aspect. This depression is preferably spherical.

The matrix can be produced in a rigid elastic plastic, in metal or in a techno-polymer such as Peek. The matrix couples with the outside of the male to obtain retention, so that the removable dental prosthesis is held in the mouth by a snap action. For the retention of the matrix with the male, the matrix is preferably provided with 4 flexible slats.

The radius of the bulge in this patent is always smaller - preferably 0.73 mm - than the radius of the depression - preferably 1.83 mm

Dental implants are often divergent and matrices must be aligned in parallel to prevent abnormal wear or fractures.

The difference in radius of depression and the associated radius of bulge creates a central contact and also creates sufficient spacing that extends radially along an outer circumference of the inner upper surface of the matrix so that matrixes pivot up to 20 ° around the center and so that the matrices can be inserted into the prosthesis parallel to each other when male arrays diverge and allow hinge properties up to 20 ° of the dental prosthesis when the dental prosthesis is also supported on soft tissue.

Alternatively, the depression of the male and the protrusion of the matrix can be a rounded conical protrusion of the matrix and a rounded conical depression of the male.

BRIEF DESCRIPTION OF THE DRAWINGS

The features of the invention will become apparent from the following description of a preferred embodiment, given as a non-limiting example.

FIG 1 is a Matrix

FIG 2 is a Patrix

FIG 3 is an axial arrangement of a Matrix with a Patrix

FIG 4 is an inclined arrangement of a Matrix with a Patrix

FIG 5 is an axial arrangement of a Matrix with a Rounded Conical bulge and a Patrix with a Rounded Conical Depression.

BE2018 / 0136

Numbers correspond to the following description:

1. Matrix

1a Lamel

1b bulge

1c Radius of the Bulge

1d Rounded Conical bulge

2. Patrix

2a Depression

2b Radius of the Depression

2c Completed Conical Depression

3. Contact Center

4. Spacing

SUMMARY OF THE INVENTION

The object of this invention is to provide a precision anchorage with a minimum height, a minimum width, a minimum of components and which can largely compensate for the divergence of Patrons (2), typically on dental implants. In this invention, the precision anchoring comprises a Patrix (2) that is generally spherical with a Depression (2a) at the center of the superior aspect.

The precision anchoring in this invention also includes a Matrix (1) that is included in the removable dental prosthesis and fits over the Patrix (2) to be removably connected by a snap mechanism to the Patrix (2). The Matrix (1) has a spherical bulge (1b) that extends radially on the internal surface and has a Center Contact (3) with the spherical Depression (2a) of the Patrix (2) when assembled. The Radius of the Projection (1c) of the Matrix (1) is smaller than the Radius of the Depression (2b) of the Patrix (2).

When the Matrix (1) is assembled axially with the Patrix (2) with the Slats (1a) and with the Center Contact (3), a Gap (4) is created that extends radially along the spherical bulge (1b). The Spacing (4) allows an oblique alignment up to 20 ° as well as a pivotal movement up to 20 ° of the Matrix (1) on top of the Patrix (2).

When the Matrix (1) is mounted at an angle with the Patrix (2) with the Slats (1a) and with the Center Contact (3), the Spacing (4) allows an oblique alignment up to 20 °.

The precision anchoring with Projection (1b) that is part of the Matrix (1) and Depression (2a) that is part of the Patrix (2) significantly reduces the height and width of the precision anchoring compared to other known precision anchors. This precision anchoring composition requires fewer components that the

BE2018 / 0136 costs and complexity then influence comparable precision anchors that also make pivotal movements possible.

The Depression (2a) of the Patrix (2) can also be a Rounded Conical Depression (2c) with a spherical Center Contact (3) and the 5 Projection (1b) of the Matrix (1) can be a Rounded Conical Projection (1d) to be. The Radius (1c) of the Rounded Conical bulge (1d) is smaller than the Radius (2b) of the tip of the Rounded Conical Depression (2c) of the Patrix (2).

Claims (5)

CONCLUSIONS A precision dental anchor for attaching a patient-removable dental prosthesis to the mouth, comprising • a generally spherically shaped Patrix (2) • a matching Matrix (1) with a removable connection to the Patrix (2) characterized in that the Patrix (2) ) has a Depression (2a) in the center of the upper aspect and the Matrix (1) has a bulge (1b) tangent to the inner top in a Center Contact (3) of the Depression (2a) of the Patrix (2) and that the Radius of the Depression (2b) of the Patrix (2) is greater than the Radius of the Projection (1c) of the Matrix (1), leaving a Gap (4) between Matrix (1) and Patrix (2) arises. A dental precision anchorage according to claim 1, characterized in that the space (4) between Matrix (1) and Patrix (2) allows a pivotal movement up to 20 ° of the Matrix (1) on the Patrix (2) A dental precision anchorage according to claims 1 and 2 characterized in that the Gap (4) between Matrix (1) and Patrix (2) allows mounting with divergence up to 20 ° of the Matrix (1) on the Patrix (2). A dental precision anchorage according to claim 1 and claim 2 and claim 3 characterized in that the Matrix (1) is segmented into at least two Slats (1a). A dental precision anchorage according to claim 1 and claim 2 and claim 3 and claim 4 characterized in that the Depression (2a) of the Patrix (2) is a Rounded Conical Depression (2c) and the Projection (1b) of the Matrix (1) is a rounded conical bulge (1d).