WO2006000289A1

WO2006000289A1 - Abutment of dental implant

Info

Publication number: WO2006000289A1
Application number: PCT/EP2005/005875
Authority: WO
Inventors: Alejandro Padros Fradera
Original assignee: Soadco, S.L.
Priority date: 2004-06-23
Filing date: 2005-06-01
Publication date: 2006-01-05
Also published as: ES2264852B1; ES2264852A1

Abstract

Abutment for dental implants, of the type which have an axial perforation suitable for the insertion of a dental prosthesis to be fixed so that it forms part of the implant abutment, the outer profile of said abutment comprising a first section of increasing width from the trunk of the screw towards its outer end, and a second section, with no solution for continuity, which forms an outer support area of the prosthesis and which is configured in the form of a cone trunk with decreasing width, in a direction towards the outer end of the screw abutment, the angle which forms the cone distance of the second section with the screw axis being between 8° and 30°; and the height of the support area being between 0.5 mm and 2.5 mm, which favours the positioning of the prosthesis on the support area.

Description

D E S C R I P T I O N

"Abutment of dental implant"

Technical field of the invention The invention refers to an abutment or prosthetic attachment for dental implants.

Background of the invention Internal cone implants are those which comprise an implant, for attachment to the jawbone, whose upper end or abutment has a blind axial perforation, which comprises a section configured in the form of a cone trunk, in which there is often an area with screw threading inside, into which a corresponding fixing stud or screw can be screwed which is provided on the dental prosthesis.

The implant and fixing screw being correctly joined, the prosthesis must rest on a support base provided on the implant abutment while, at the same time remaining adhered to the protruding section of the fixing screw, often configured in the form a cone trunk with decreasing width and called a pillar-screw.

However, this type of implant has a serious tolerance problem, however well it is manufactured, which causes the prosthesis, when resting on the support base, to have a non-tolerable play with respect to the pillar-screw, or protruding section of the fixing screw, and with the prosthesis well positioned on the upper section of the fixing screw, the latter does not sufficiently rest on the base support of the screw, which could cause problems during masticatory cycles, especially when lateral forces are produced.

Explanation of the invention The abutment of the dental implant being the object of the invention, is of the type which have an axial perforation suitable for the insertion of a dental prosthesis to be fixed so that it forms part of the implant abutment, the outer profile of said abutment comprising a first section of increasing width from the trunk of the implant towards its outer end, and a second section, with no solution for continuity, which forms an outer support area of the prosthesis and which is configured in the form of a cone trunk with decreasing width, in a direction towards the outer end of the implant abutment, which forms the upper end of the abutment.

In essence, the abutment is characterized in that the angle which forms the cone distance of said second section with the screw axis is between 8° and 30° and in that the height of said support area is between 0.5mm and 2.5mm, which surprisingly favours the positioning of the prosthesis on the support area.

Preferably, the angle which forms the cone distance of the second section with the screw axis is between 10° and 20°.

Brief description of the drawings The attached drawings contain an illustration of a form of embodiment of the abutment implants being the object of the invention. More specifically:

Fig.1 , is an elevational view of a dental implant whose upper end or abutment is configured in accordance with the invention; and

Fig. 2, is a detailed view of the abutment of the implant in Fig. 1 and of the section protruding from the fixing screw, or pillar-screw, with the prosthesis, fixed so that they form part of the implant abutment and represented in sections.

Detailed description of the drawings The implant 2 in Fig. 1 has on its upper end a widening which forms the abutment 1 thereof.

The external profile of the abutment 1 comprises a first section 3 of increasing width, which starts in the threaded trunk of the implant 2, and a second section joined to the first one, with no solution for continuity, and which forms the support base or outer support area 4 of the prosthesis 6.

This support area 4 is configured in the form of a cone trunk, decreasing in a direction towards the outer end of the implant 2, and its cone distance forms a 20° angle with the axis 5 of the screw 2. The height of the support area 4 is between 0.5mm and 2.5mm, although the example in the drawings is not to scale.

In Fig. 2, the section 8 protruding from the fixing screw and the prosthesis 6 can be seen and, although exaggerated, the play 9 that may exist between said prosthesis and the upper surface of the fixing screw is represented which, in the worst cases, is caused by the accumulation of deviations in the measurements of the abutment of the screw and the prosthesis, although still within the margins of tolerance.

However, with the angle being reduced with respect to the axis 5 of the screw, not only does it ensure that the prosthesis 6 is properly positioned on the support area 4, but also that the contact surface 7 between the prosthesis 6 and the support area 4 is increased, as shown in Fig. 2, making it much more resilient to side forces produced during masticatory cycles.

Furthermore, when differences between the implant axis of insertion and the prosthesis axis of protrusion 6 have to be corrected, the angles between both axes are usually about 15°, for which the optimum cone angle correcting the difference between axes must also be close to 15°. A reduction in the cone angle to values lower than 8° would make correction of the aesthetic axis of the prosthesis difficult

Claims

- A -C L A I M S

1.- Abutment (1) for dental implants (2), of the type which have an axial perforation suitable for the insertion of a dental prosthesis to be fixed so that it forms part of the implant abutment (1), the outer profile of said abutment comprising a first section (3) of increasing width from the trunk of the screw towards its outer end, and a second section (4), with no solution for continuity, which forms an outer support area of the prosthesis and which is configured in the form of a cone trunk with decreasing width, in a direction towards the outer end of the screw abutment, which forms the upper end of the abutment (1), characterized in that the angle (w) which forms the cone distance of the second section with the axis (5) of the screw (2) is between 8° and 30° and in that the height (h) of said support area is between 0.5mm and 2.5mm, which favours the positioning of the prosthesis on the support area.

2.- Abutment for dental implants according to claim 1 , characterized in that the angle which forms the cone distance of the second section with the screw axis is preferably between 10° and 20°.