CN210113625U - Intraoral scanner accuracy evaluation standard model - Google Patents

Abstract

The utility model discloses an intraoral scanner accuracy evaluation standard model, its characterized in that: the model includes closes base (1), simulation gum (2) on last bite, it is provided with simulation gum (2) on the base (1) to go up bite, the last bite of simulation gum (2) closes 13 position (3), 17 position (4), 23 position (5), 27 position (6) installation ball test pieces, the last bite of simulation gum (2) closes 16 position (7) installation crown body test pieces, the last bite of simulation gum (2) closes 26 position (8) installation inlay test pieces, install the simulation tooth on the other positions of simulation gum (2). Aiming at the problems that a uniform model for evaluating the accuracy of the intraoral scanner is not available at present and whether the model can reach the level required by clinical implementation or not, an integrated model is designed.

Description

Intraoral scanner accuracy evaluation standard model

Technical Field

The utility model relates to a model field is used in the scanner aassessment specifically is an intraoral scanner accuracy evaluation standard model.

Background

With the rapid development of CAD and CAM, digitization is introduced into the dental field. Today, extraoral scanners are commonly used in dental preparation, prosthetics, orthodontics, and the like. Overall, the use of an extraoral scanner by a dental technician in the laboratory saves a lot of time to provide a more perfect prosthesis for the patient. Although the extraoral scanner brings many conveniences, it scans the plaster model and impression, and therefore, inevitable errors are generated in the preparation process. In addition, the phenomena of discomfort for patients and long preparation time exist in the process of preparing the printing film. Therefore, the intraoral scanner is invented, the intraoral scanner better meets the clinical requirements of personalized manufacture and rapidness, and the impression of a patient is not needed, so that technicians or stomatologists can edit and innovate more independently and accurately just in front of a computer, the prepared prosthesis is more suitable for the occlusion relation of the patient, and the dentistry becomes simpler. And compared with an extraoral scanner, the intraoral scanner is smaller, and the tension of a patient caused by complicated treatment steps is relieved from the medical psychology perspective.

But the accuracy assessment for clinically used intraoral scanners is still not complete. On the one hand, there are few people using standards for intraoral scanners to evaluate. On the other hand, experimental studies on the reproducibility of intraoral digitized impressions are relatively rare. There are many aspects to the evaluation of intraoral scanners that are worth exploring, such as how to design a model of scan accuracy that is more scientific.

The conventional models currently used to assess the accuracy of intraoral scanners suffer from the following disadvantages: models such as an inlay model (concave), a crown model (convex), a spherical model, a full-mouth dentition and the like need to be manufactured and evaluated respectively, so that errors are large, and evaluation results are not reliable.

Disclosure of Invention

The utility model discloses to above weak point, provide an intraoral scanner accuracy evaluation standard model, to lacking the unanimous unified model that is used for evaluating intraoral scanner accuracy at present to and the model can reach the problem of clinical implementation required level, designed out the integration model.

At present, model design for eliminating measurement errors at the rear part of the dental arch by using a spherical ball does not exist. And at the same time, scan test pieces which are internationally recognized and have different detection capabilities and clinical application values are adhered to the dental arch model, so that the model can evaluate the intraoral scanner more comprehensively, the methods do not exist, all designs of the patent are initiated at home, and the method has certain social value and practical significance.

The utility model provides a scheme that above technical problem took is: the utility model provides an intraoral scanner accuracy aassessment standard model, the model includes closes base, simulation teethridge, it is provided with the simulation teethridge on the base to go up the bite and closes 13 positions, 17 positions, 23 positions, 27 positions installation ball test pieces to go up the bite of simulation teethridge, the crown body test piece is installed to the last bite of simulation teethridge 16 positions, the last bite of simulation teethridge closes 26 positions installation inlay test pieces, install simulation tooth on the other positions of simulation teethridge.

Further, the ball test piece is a sphere.

Further, the crown body test piece is a circular truncated cone.

Further, the inlay test piece is rectangular terrace with edge or square, the inside cylinder fretwork that is provided with of rectangular terrace with edge.

Further, the ratio of the dental arch of the model to the human dental arch is 1: 1.

Further, the ball test piece, the crown body test piece and the inlay test piece model are all processed by titanium alloy, and are sandblasted with silicon carbide coatings.

The prior research shows that the accuracy of scanning convex surfaces and concave surfaces of the same scanner is different, and in the research, the inlay model is scanned by using the intraoral scanner, and the accuracy of the intraoral scanner can be more accurately judged by taking the concave and convex surfaces into consideration.

While research on intraoral scanners is now underway, the clinical value of many studies is on the one hand that the greatest deviation in scanning occurs in the posterior aspect of the dental arch, which may be associated with scanning techniques and difficulties in accessing these areas, which have placed existing studies into a bottleneck. Therefore, an integrated model is designed, a casting is placed on a scanning difficult area, and the scanner is evaluated based on a complex dentition environment. The bottleneck problem is solved, and the result is more convincing and advanced.

Research has shown that the larger the magnification of the model is, the larger the deviation is. Based on this, the utility model combines the inlay model and the sphere model to form a mixed model, and adopts a ratio of 1:1 with the human dental arch, and evaluates the accuracy of the scanner on the premise of reducing the measurement deviation as much as possible.

Drawings

Fig. 1 is a schematic structural view of the present invention;

FIG. 2 shows a crown specimen scan index;

FIG. 3 is an inlay specimen scan index.

Detailed Description

The invention is described in detail below with reference to the following figures and specific embodiments:

example 1

The utility model provides an intraoral scanner accuracy aassessment standard model, the model includes closes base 1, simulation gum 2 on the last bite, be provided with simulation gum 2 on closing base 1, the last bite of simulation gum 2 closes 13 position 3, 17 position 4, 23 position 5, 27 position 6 installation ball test pieces, the last bite of simulation gum 2 closes 16 positions 7 installation crown body test pieces, the last bite of simulation gum 2 closes 26 positions 8 installation inlay test pieces, install simulation tooth on the other positions of simulation gum 2. The ball test piece is a sphere. The crown body test piece is a circular truncated cone. The inlay test piece is the quadrangular frustum, the inside cylinder fretwork that is provided with of quadrangular frustum. The ratio of the dental arch of the model to the dental arch of the human body is 1: 1. The ball test piece, the crown body test piece and the inlay test piece model are all processed by titanium alloy, and are sandblasted with silicon carbide coatings.

Model detection index and principle

As shown in the figure, the detection indexes are all detected by using detection software (GeomagicControl X) specified by the International Committee for standardization.

The scanning index for the crown body test piece is shown in fig. 2, and the diameter of the upper surface circle, the diameter of the lower surface circle, and the height of the crown are measured.

The scanning index of the inlay test piece is shown in fig. 3, and the diameters of the upper and lower circular sockets of the inlay and the distance from the bottom surface to the upper surface of the socket hole are measured.

For the four sphere center distance measurement indexes in dentition, as shown in fig. 1:

and (3) detection data processing:

dR represents a reference value for the object, dM represents a measured value (including length, depth, height, center-to-center distance)

dA represents the mean value obtained, S represents the standard deviation obtained

The prediction and precision are quantified by correlation error to evaluate the accuracy (accuracy) of the intraoral scanner

And (3) calculating a correlation error:

∆dM=

|

∆S(dM)= |

|

the related error Δ dM represents the trueneness of the scan result, and the related error Δ S (dM) describes the precision of the scan result.

Foreground and realistic significance of models

The model can be used for more accurately and convincingly evaluating the accuracy of the intraoral scanner, and the incompleteness of the conventional intraoral scanner evaluation method or model is filled. The development of intraoral scanners and oral medical digitization is promoted, and the method has high practical significance for medical science and technology innovation and navigation.

Claims (6)

1. An intraoral scanner accuracy evaluation standard model is characterized in that: the model includes closes base (1), simulation gum (2) on last bite, it is provided with simulation gum (2) on the base (1) to go up bite, the last bite of simulation gum (2) closes 13 position (3), 17 position (4), 23 position (5), 27 position (6) installation ball test pieces, the last bite of simulation gum (2) closes 16 position (7) installation crown body test pieces, the last bite of simulation gum (2) closes 26 position (8) installation inlay test pieces, install the simulation tooth on the other positions of simulation gum (2).

2. The intraoral scanner accuracy assessment standard model of claim 1, wherein: the ball test piece is a sphere.

3. The intraoral scanner accuracy assessment standard model of claim 1, wherein: the crown body test piece is a circular truncated cone.

4. The intraoral scanner accuracy assessment standard model of claim 1, wherein: the inlay test piece is the quadrangular frustum, the inside cylinder fretwork that is provided with of quadrangular frustum.

5. The intraoral scanner accuracy assessment standard model of claim 1, wherein: the ratio of the dental arch of the model to the dental arch of the human body is 1: 1.

6. The intraoral scanner accuracy assessment standard model of claim 1, wherein: the ball test piece, the crown body test piece and the inlay test piece model are all processed by titanium alloy, and are sandblasted with silicon carbide coatings.

Images