CN-121997399-A - Digital method for accurate copying transfer and verification of in-place channel

CN121997399ACN 121997399 ACN121997399 ACN 121997399ACN-121997399-A

Abstract

The invention discloses a digital method for accurate replication, transfer and verification of a locating channel, and belongs to the technical field of oral repair digitization. The method comprises the following steps of observing a locating channel of a digital model in dental restoration computer aided design software, generating a filling concave model along an observation direction, constructing a parameterized three-dimensional characteristic model according to the filling concave model in reverse modeling software, automatically identifying a projection contour of the characteristic model through an algorithm, calculating a deviation angle between the current observation direction and a target locating channel, and guiding model observation adjustment. The invention constructs the in-situ channel consistency verification system, realizes accurate replication and transfer of the in-situ channel direction in a digital mode, can adapt to the dental restoration computer aided design software with different functional configurations, and provides a standardized and verifiable in-situ channel digital transmission scheme for dental restoration clinical diagnosis and treatment.

Inventors

LIU XIAOZHOU
WU LIN
CHEN QI

Assignees

中国医科大学附属口腔医院

Dates

Publication Date: 20260508
Application Date: 20260123

Claims (2)

1. A digital method for accurate copying, transferring and verifying of a locating channel is characterized by being adaptable to dental restoration computer aided design software with different functional configurations, and comprises a direct method and an indirect method, wherein the direct method is suitable for restoration design software capable of importing and aligning other digital models in a model observation process, and specifically comprises the following steps of: S1, observing a locating channel of a model in repairing CAD software, and obtaining a model with a concave filling along the observation direction, wherein the bottom surface of the concave filling model is vertical to the locating channel direction; S2, importing the inverted concave filling model into reverse modeling software Geomagic, constructing plane characteristics and normal characteristics of the bottom surface of the model, wherein the normal direction indicates the direction of a locating channel of the model, and constructing three cylindrical characteristic models with the locating channel as a central axis, wherein the diameter is 10 mm, and the height is 15 mm; s3, adjusting the positions of the cylindrical feature models to enable the cylindrical feature models to be respectively positioned in front of, on the left side of and on the right side of the inverted concave filling model, so that model observation and prosthesis design are not affected, and combining the cylindrical feature models and the inverted concave filling model; S4, when the working model is observed in the repairing CAD software, a filling concave model with a cylindrical characteristic is imported, and the working model and the filling concave model are aligned by using an alignment function in the CAD software; s5, synchronously rotating the working model and the filling concave die until the top surface of the cylindrical feature model faces the screen completely, so that the projection contour of the feature model under the current observation angle is as close to a perfect circle as possible, and the rest part of the feature model is not exposed; S6, capturing under the current observation angle, wherein the capturing range comprises three complete cylinder feature models; S7, importing the screenshot into a channel consistency verification system, preprocessing the screenshot, automatically identifying the projection profile of a cylindrical feature model in the screenshot, and carrying out initial judgment to provide analysis suggestions, and finally generating a verification report and an observation direction adjustment scheme, wherein the verification report and the observation direction adjustment scheme comprise angle deviations of the channel direction on an X axis and a Y axis, so that accurate transfer of the channel is assisted, and the adjustment scheme is only used as a reference.
2. A digital method for accurate copy transfer and verification of in-place channels based on the method of claim 1 is characterized in that the method can be adapted to dental restoration computer aided design software with different function configurations, the indirect method is suitable for restoration design software without the functions, and the specific steps are as follows: S1, observing a locating channel of a model in repairing CAD software, and obtaining a model with a concave filling along the observation direction, wherein the bottom surface of the concave filling model is vertical to the locating channel direction; S2, importing the inverted concave filling model into reverse modeling software Geomagic, constructing plane characteristics and normal characteristics of the bottom surface of the model, wherein the normal direction indicates the direction of a locating channel of the model, and constructing three cylindrical characteristic models with the locating channel as a central axis, wherein the diameter is 10 mm, and the height is 15 mm; s3, importing the working model into reverse modeling software Geomagic, performing best fitting according to the occlusal surface morphological characteristics of the model, and registering the space coordinates of the unified working model and the inverted concave filling model; s4, transferring the cylindrical feature model to a working model, and merging; S5, observing a working model with a cylindrical feature model in the repairing CAD software, and adjusting the observation angle of the working model until the top surface of the cylindrical feature model faces the screen completely, so that the projection contour of the feature model under the current observation angle is as close to a perfect circle as possible, and the rest part of the feature model is not exposed; S6, capturing under the current observation angle, wherein the capturing range comprises three complete cylinder feature models; S7, importing the screenshot into a channel consistency verification system, preprocessing the screenshot, automatically identifying the projection profile of a cylindrical feature model in the screenshot, and carrying out initial judgment to provide analysis suggestions, and finally generating a verification report and an observation direction adjustment scheme, wherein the verification report and the observation direction adjustment scheme comprise angle deviations of the channel direction on an X axis and a Y axis, so that accurate transfer of the channel is assisted, and the adjustment scheme is only used as a reference.

Description

Digital method for accurate copying transfer and verification of in-place channel Technical Field The invention belongs to the technical field of oral repair digitization, and particularly relates to a digitization method for copying, transferring and verifying a prosthetic in-situ channel. Background In the oral cavity restoration, the correct in-place channel design is a foundation for ensuring that the restoration body obtains good retention and stability, can effectively guide clinical tooth preparation, implant implantation, the overall structural design of the restoration body and the like, and has important significance for improving the long-term restoration effect. Thus, accurate recording and accurate replication transfer of the tracks in place is critical to the design and fabrication of the prosthesis. In removable partial denture repair of dentition defects, the in-place canal refers to a specific direction followed by the denture when the denture is positioned on the rest of the alveolar ridge and the abutment, and the design needs to comprehensively consider a plurality of factors such as retention, stability, support, beauty, rest of the tooth health and the like. The determination of the optimal in-place channel direction through model observation is a key step for ensuring the denture restoration effect. In addition, the direction of the locating channel is required to be transferred among a plurality of links such as diagnosis design, abutment preparation, denture manufacturing and the like, so that the consistency of the locating channel in the repairing process is ensured to have important clinical significance. In the field of implant restoration, the concept of the in-situ canal is expanded into digital planning and accurate replication and transfer of the implant implantation direction. The implantation planning taking repair as guide follows the reverse design principle, the optimal three-dimensional position and implantation angle of the implant are reversely deduced by taking the ideal form and position of the final prosthesis as a reference, and the implantation direction of the virtual planning is accurately copied and transferred to an operation area through a digital implantation guide plate. In implantable removable partial denture restoration, the implant implantation direction must be kept parallel to the denture site canal, however this procedure is still challenging in clinical practice. The traditional in-place channel copying and transferring method is complicated in steps and is easily influenced by subjective factors, and the requirements of modern digital diagnosis and treatment on accuracy and high efficiency cannot be met. With the development of optical three-dimensional scanning and computer aided design and manufacturing (CAD-CAM) techniques, researchers have proposed digital guide plate techniques that can accurately replicate and transfer the designed placement channels into the patient's mouth. However, the existing scheme mainly realizes the copy transfer of the positioning channel from the design software to the oral cavity, and a reverse path for accurately transferring the actual positioning channel direction in the oral cavity to the design software is not established. This may lead to deviations of the subsequently used lane from the initial lane determined at the stage of the guide plate design, which is common in various repair scenarios involving lane replication and migration. In addition, existing digital lane replication and transfer schemes lack visual indication of lane orientation, and consistency of transfer results has not been verified. Aiming at the problems, the invention provides a digital method for accurate copy transfer and verification of a site canal, and the core technical principle of the digital method can be widely applied to the field of oral restoration related to the accurate copy transfer requirement of the site canal. Disclosure of Invention The invention aims to provide a digital method for accurate copy transfer and verification of a positioning channel, which solves the problems in the background technology. In order to achieve the aim, the invention provides a digital method for accurate replication, transfer and verification of a locating channel, which can be adapted to dental restoration computer aided design software with different functional configurations and comprises a direct method and an indirect method, wherein the specific steps of the direct method are as follows: S1, observing a locating channel of a model in repairing CAD software, and obtaining a model with a concave filling along the observation direction, wherein the bottom surface of the concave filling model is vertical to the locating channel direction; S2, importing the inverted concave filling model into reverse modeling software Geomagic, constructing plane characteristics and normal characteristics of the bottom surface of the model, wherein the