Scanable tray for producing a dental prosthesis

Patent metadata

Field	Value
Publication number	US-10524650-B2
Application number	US-201414897768-A
Country	US
Kind code	B2
Filing date	Jun 13, 2014
Priority date	Jun 14, 2013
Publication date	Jan 7, 2020
Grant date	Jan 7, 2020

Abstract

A method for taking an impression for producing a dental prosthesis involves:
A) generating an impression of regions of the upper jaw and lower jaw of a patient using an at least two-part tray, whereby the tray is inserted into the oral cavity of the patient; B) fixing the at least two tray parts to each other or against each other; C) determining the position and orientation of the at least two tray parts with respect to each other; and D) taking the tray parts out of the oral cavity of the patient. Also disclosed is the tray for implementing the method, whereby at least one marking is arranged on the surface of each tray part, and a device for intra-oral determination of the orientation and position of the marking and, thus, the at least two tray parts, is provided, whereby the device comprises a computer and a recording facility.

First claim

The invention claimed is:

1. A method for taking an impression of at least partial regions of an upper and lower jaw of a patient for producing a dental prosthesis, said method comprising the steps of:
A) generating an impression of at least partial regions of the upper jaw and lower jaw of the patient using an at least two-part tray in an oral cavity of the patient, whereby the tray is inserted into the oral cavity of the patient for this purpose;
wherein the at least two-part tray comprises at least one tray part for the upper jaw and at least one tray part for the lower jaw, whereby the tray parts are placed at a distance from each other by means of a screw or a pin, and are attachable at an adjustable distance from each other,
wherein the pin, which comprises a mobile pestle that is supported against one of the tray parts as in a bearing in spring-loaded manner, or the screw is arranged on one of the tray parts, whereby the other tray part comprises a recess for accommodation of a tip of the screw or a tip of the pestle, whereby the recess comprises a matching counter-thread for the screw or the recess is a negative fit for the tip of the pestle, whereby the tip of the pestle is arranged appropriately mobile in the recess such that it can be inclined towards all sides,
wherein at least one marking is arranged on a surface of each tray part and the markings are arranged on an edge of the tray parts such that the markings of adjacent tray parts that are inserted into the oral cavity of the patient are situated as close to each other such that the markings can be imaged on just one image of a recording device in the oral cavity of the patient,
B) fixing the at least two tray parts to each other or against each other in the oral cavity of the patient;
C) thereafter determining the position and orientation of the at least two tray parts with respect to each other in the oral cavity of the patient;
wherein the position and orientation of the tray parts with respect to each other are determined by means of the at least one marking on each of the tray parts arranged on a labial surface of the tray parts, wherein the at least one marking is a three-dimensional contoured marking that permits tilting of the marking to be recognized and measured; wherein the position and orientation of the markings of the tray parts are determined with respect to each other and data obtained regarding the position and orientation of the markings are used to determine the position and orientation of the tray parts with respect to each other; and wherein the position and orientation of the tray parts are determined with respect to each other by intra-orally imaging or scanning with an optical method the labial surfaces of the tray parts, at least regions thereof, whereby at least two markings of at least two different tray parts are imaged or scanned concurrently, and
D) thereafter taking the tray parts out of the oral cavity of the patient.

2. Method according to claim 1 , which further comprises determining the position and orientation of the tray parts with respect to each other by recording, digitizing and analyzing regions of the tray parts, which regions optionally comprise the markings, in a computer-based manner by means of a stereo image or at least two images taken from different perspectives.

3. Method according to claim 1 , which further comprises detaching the at least two tray parts from each other before removing from the oral cavity of the patient and after determining the position and orientation of the at least two tray parts with respect to each other, and removing the tray parts from the oral cavity separately.

4. Method according to claim 1 , which further comprises providing a lip shield as at least a third tray part and optionally attaching the lip shield to the tray part for the upper jaw, whereby the lip shield optionally has at least one marking that is used to determine the position and orientation of the lip shield with respect to the tray part for the upper jaw and/or that the lip shield has a surface provided on it on which can be written and which serves to have aesthetic features drawn on it and which has at least one aesthetic feature drawn on it.

5. Method according to claim 1 , which further comprises storing the position and orientation of the at least two tray parts with respect to each other in a computer and using them to calculate a virtual model of the dental prosthesis to be produced, and optionally to calculate the orientation and size of the dental prosthesis of a denture for the upper jaw and/or a denture for the lower jaw of the patient.

6. Method according to claim 5 , which further comprises producing the dental prosthesis by means of a CAD/CAM method, whereby the position and orientation of the at least two tray parts with respect to each other are utilised in the generation of a virtual CAD model.

7. Method according to claim 1 , which further comprises using an impression of the upper jaw and/or lower jaw of the patient taken with the tray to generate a data set by reading a three-dimensional surface structure of the impression of the upper jaw and/or lower jaw of the patient, and optionally using the data set to generate the virtual CAD model of the dental prosthesis, optionally a denture, which is used to produce a real dental prosthesis, optionally a real denture.

8. Method according to claim 1 , which further comprises attaching a rigid connecting element with multiple markings, optionally an irregular raster or an irregular grid, to the at least two tray parts and using the connecting element to determine the position and orientation of the at least two tray parts with respect to each other.

9. A method for taking an impression of at least partial regions of an upper and lower jaw of a patient for producing a dental prosthesis, said method comprising the steps of:
A) generating an impression of at least partial regions of the upper jaw and lower jaw of the patient using an at least two-part tray in an oral cavity of the patient, whereby the tray is inserted into the oral cavity of the patient for this purpose;
B) fixing the at least two tray parts to each other or against each other in the oral cavity of the patient;
C) thereafter determining the position and orientation of the at least two tray parts with respect to each other in the oral cavity of the patient;
wherein the position and orientation of the tray parts with respect to each other are determined by means of at least one marking on each of the tray parts arranged on a labial surface of the tray, wherein the at least one marking is a three-dimensional contoured marking that is elevated with respect to and projects from said surface of the tray that permits tilting of the marking to be recognized and measured; and wherein the position and orientation of the markings of the tray parts are determined with respect to each other by intra-oral imaging or scanning with an optical method the labial surfaces of the tray parts, at least regions thereof, whereby at least two markings of at least two different tray parts are imaged or scanned concurrently and data obtained regarding the position and orientation of the markings are used to determine the position and orientation of the tray parts with respect to each other, and
D) thereafter taking the tray parts out of the oral cavity of the patient.

Assignees

• Heraeus Kulzer Gmbh
• Kulzer & Co Gmbh

Inventors

• Beyer Mario
• Ueberück Norbert
• Böhm Uwe

Classifications

• A61B5/0088

  for oral or dental tissue · CPC title

• A61B1/24 Primary

  for the mouth, i.e. stomatoscopes, e.g. with tongue depressors; Instruments for opening or keeping open the mouth · CPC title

• A61C13/0019

  using three dimensional printing · CPC title

• A61B2090/3912

  Body cavities · CPC title

• A61C9/0006 Primary

  Impression trays · CPC title