CN-121985919-A - Fiducial markers and methods for generating dental restoration position data

Abstract

The present invention provides a method of generating a digital model for constructing an oral restoration, wherein the method comprises superimposing and registering preoperative IOS data and PG data using scannable fiducial markers (including bite references), and further superimposing post-operative PG data to accurately reflect the location of abutment references and restoration, thereby generating a reliable three-dimensional digital model representing the exact spatial relationship of teeth, soft tissue, abutment and implant.

Inventors

• Alan Banksy

Assignees

• 先临三维科技股份有限公司

Dates

Publication Date

20260505

Application Date

20250910

Priority Date

20240910

Claims (5)

1. 1. A method of generating a digital model for constructing an oral restoration, wherein the oral cavity of a patient includes teeth and soft tissue prior to surgery, the method comprising the steps of: (i) Installing an bite reference in the oral cavity, wherein the bite reference comprises a plurality of scannable features; (ii) Performing a preoperative intraoral IOS scan to capture data related to at least a portion of teeth and at least one of the scannable features; (iii) Performing a pre-operative photogrammetry PG scan to capture data related to at least one of the scannable features; (iv) Registering and superposing the data obtained by the preoperative IOS scanning and the data obtained by the preoperative PG scanning to obtain the position information of the teeth and the soft tissues relative to the occlusion reference; (v) Optionally removing the bite references; (vi) Removing the teeth; (vii) Installing an implant in the patient's mouth; (viii) Installing a abutment into the implant; (ix) Mounting a submount datum directly or indirectly into the submount, wherein the submount datum comprises a plurality of scannable features; (x) Performing a post-operative PG scan to capture data relating to at least one of the scannable feature of the bite reference and one or more features of the abutment reference, and (Xi) The data obtained from the post-operative PG scan is registered with the information obtained from the pre-operative IOS scan to obtain positional information of the abutment reference relative to the teeth prior to extraction.
2. 2. The method of claim 1, wherein installing the bite references comprises: The bite references are mounted into the bones of the palate or the bones of the posterior bearing area.
3. 3. The method of any one of the preceding claims, wherein installing the bite reference comprises: the snap-fit datum is mounted on a surgical guide or snap-fit guide which has been mounted in the posterior bearing region or subsequently in the posterior bearing region.
4. 4. The method of any of the preceding claims, wherein registering and superimposing the data obtained from the pre-operative IOS scan with the data obtained from the pre-operative PG scan comprises: Correlating the data of the one or more scannable features obtained by the pre-operative PG scan with the data of the one or more scannable features obtained by the pre-operative IOS scan with respect to the bite reference to obtain location data of the one or more scannable features of the bite reference obtained by the pre-operative PG scan, and information associated with the location data of the tooth and the soft tissue obtained by the pre-operative IOS scan.
5. 5. A method according to any preceding claim, wherein the step of performing a preoperative IOS scan and the step of performing a preoperative PG scan are performed simultaneously or sequentially.

Description

Fiducial markers and methods for generating dental restoration position data The present application claims priority from U.S. provisional application No. 63/693,152 filed on 10/9 at 2024, the entire contents of which are incorporated herein by reference. Technical Field Embodiments of the present invention provide a fiducial marker and method for generating dental restoration position data. Background In the field of the manufacture and installation of dental restorations, in particular full arch dental restorations, it is necessary to remove the existing teeth of the patient and install implants and abutments. The restoration (i.e. the full dental arch restoration) is fixed in place by the abutment after being manufactured. During the manufacture of the prosthesis, the position and orientation of the abutment is critical to the proper positioning of the prosthesis within the patient's mouth. In the conventional art, the position and orientation of the abutment is determined by taking physical impressions, and then making a prosthesis based on the information obtained from these impressions. Modern technology adopts digital imaging technology to generate oral cavity digital model, and based on the oral cavity digital model, a prosthesis is manufactured. For example, post-operative digital imaging of the abutment may be performed directly in the patient's mouth. Common digital imaging techniques include intraoral scanning (Intraoral Scanning, IOS) and photogrammetry (Photogrammetry, PG). Intraoral scanning requires the use of a device capable of emitting electromagnetic radiation (e.g., light or laser) that contacts intraoral objects (e.g., teeth and soft tissue) and then creates a digital model by combining an image scanner with point cloud data. To determine the position and orientation of the abutment, a device with scannable features (often referred to as a scan volume) is typically temporarily mounted to the abutment during intraoral scanning. The photogrammetry uses a photographing device to collect multiple images of a target object and generates a three-dimensional digital model through a triangulation algorithm. It is known to those skilled in the art that photogrammetry can achieve the highest accuracy when the photographic image is able to capture a known size. Therefore, it is common to temporarily mount the scan bodies on the base, where markers (often referred to as targets) are provided on the scan bodies, and the distance between the markers is a known parameter (e.g., a plurality of marker points are provided on the scan bodies). Although photogrammetry is very effective in generating high-precision three-dimensional digital models of abutment position and orientation, this technique does not provide effective imaging effects for teeth and soft tissue. Information about the original bite morphology of the patient is critical to make a usable prosthesis. The original bite morphology of the patient may be obtained by taking a physical impression or by using an intraoral scan. Because of limitations in photogrammetry imaging, it is generally not useful for preoperative imaging of teeth and soft tissue. The pre-operative data (i.e., data acquired by solid-body impression or intraoral scanning) is then correlated with post-operative imaging data of the abutment position and orientation (this process is also referred to as "registration stacking"). Disclosure of Invention One or more embodiments of the present invention provide a method of generating a digital model for constructing an oral restoration, the oral cavity of a patient comprising teeth and soft tissue prior to surgery, the method comprising (i) a method of generating a digital model for constructing an oral restoration, the oral cavity of a patient comprising teeth and soft tissue prior to surgery, (v) optionally removing the bite reference, (vi) fitting the teeth in the oral cavity of the patient, wherein the bite reference comprises a plurality of scannable features, (ii) performing an intraoral IOS scan to capture at least a portion of the teeth and related data of at least one of the scannable features, (iii) performing a preoperative photogrammetry PG scan to capture related data of at least one of the scannable features, (iv) superimposing data obtained by the preoperative IOS scan with data obtained by the preoperative PG scan to obtain positional information of the teeth and the soft tissue relative to the bite reference, (vi) removing the bite reference, (viii) fitting the dental implant in the oral cavity of the patient, (iii) fitting the dental implant in a base station directly into the base station, (ix) scanning the base station, wherein the base station is indirectly accessible to the base station, to capture data related to at least one of the scannable feature of the bite reference and one or more features of the abutment reference, and (xi) to overlay data obtained from a post-operative PG scan with information obta