JP2015080569A - Dental prosthesis manufacturing apparatus and dental prosthesis manufacturing method. - Google Patents

Abstract

A dental prosthesis manufacturing apparatus and a dental prosthesis manufacturing method capable of obtaining an impression of a front reference point of an artificial dental arch and recording a jaw position at the same time when a dental prosthesis is manufactured by CAD / CAM. . A dental prosthesis manufacturing apparatus 10 has a size and thickness that can be supported by a lip when mounted in the oral cavity, and a bite stage unit 12 capable of entering a front reference point of an artificial dental arch, and a bite stage A bite fork part 14 which is attached to the part 12 and can be fixed to at least one of the upper jaw impression tray and the lower jaw impression tray in the oral cavity and can be taken out of the oral cavity without changing the positional relationship with the bite stage part 12; The anterior post part 16 which is attached to the bite stage part 12 and serves as a reference point for superimposing the patient's image data and the CAD data of the impression, and attached to the bite stage part 12 on the patient's head when installed in the oral cavity And a headband portion 18 that can be mounted so as to be parallel to the prosthetic plane. [Selection] Figure 2

Description

  The present invention relates to a dental prosthesis manufacturing apparatus and a dental prosthesis manufacturing method used when manufacturing a dental prosthesis.

  Conventionally, an anterior tooth artificial tooth as a dental prosthesis (hote) object (or device) is generally determined with reference to an anterior reference point determined vertically, horizontally, and anteroposteriorly. is there. The vertical arrangement position is based on the lip joint line when the upper and lower lips are closed in a physiologically resting state, and the horizontal arrangement position is based on the face midline. Further, the anteroposterior position is based on the lip of the lip obtained by the patient with the lip lightly closed. In addition, a virtual occlusal plane is determined based on the prosthetic plane, and the anterior teeth artificial teeth can be arranged.

  In this way, in addition to the upper and lower lip joint line, the face midline, the line that records the lip richness determined by the operator, and the virtual occlusal plane, the jaw position (gait) is obtained. A series of operations is called occlusal acquisition in dentistry.

  For example, when determining the front reference point of a patient's artificial dental arch when making a complete denture, it is necessary to correct the excess and deficiency of the lip side of the occlusal levee. The position is taken. Such work is performed on a trial and error basis, requiring a lot of time and labor, and the burden on the patient and the operator is great.

  Also, in recent denture creation methods using CAD / CAM as disclosed in Patent Document 1, dentures are often created by optically scanning the impression surface. In this case, since an occlusal acquisition is performed at the same time as an impression acquisition, an effect such as a reduction in the number of patient visits is expected. On the other hand, as described above, since the front reference point that was originally obtained by trial and error at the time of occlusion acquisition lost the opportunity to be acquired, it is recorded at the time of occlusion acquisition performed at the same time as impression acquisition New methods have become necessary. Many of the current methods use methods such as recording the measurement results using vernier calipers or taking average values after taking an impression, but they are simple and can be used as an alternative to the conventional occlusal acquisition method. A reliable method for obtaining a forward reference point has not been established.

JP-T-2006-521136

  The present invention relates to a dental prosthesis manufacturing apparatus and a dental prosthesis manufacturing method that can record an anterior reference point of an artificial dental arch at the same time as impression and jaw position acquisition when a dental prosthesis is manufactured by CAD / CAM. It is a problem to obtain.

  A dental prosthesis manufacturing apparatus according to claim 1 of the present invention is sized and thick enough to be supported in a lip in a state that it can be mounted in the oral cavity of a patient and is mounted in the oral cavity, and an artificial dentition A bite stage part capable of entering a forward reference point of the bow, and attached to the bite stage part, and capable of being fixed to at least one of an upper jaw impression tray and a lower jaw impression tray in the oral cavity. A bite fork part that can be taken out of the oral cavity without changing the positional relationship with the bite stage part, and attached to the bite stage part to superimpose the image data of the patient and the CAD data of the impression A post part serving as a reference point for the tool and attached to the bite stage part, and the bite stage part and the bite fork part are mounted in the oral cavity. In state, having a head band portion mountable so as to be parallel to the prosthesis histological plane on the head of the patient.

  According to the above configuration, after taking an impression using at least one of the upper jaw impression tray and the lower jaw impression tray according to a well-known normal method, the bite stage portion of the dental prosthesis manufacturing apparatus, A bite fork portion attached to the bite stage portion is mounted in the oral cavity, and the bite fork portion is interposed between at least one of the upper jaw impression tray and the lower jaw impression tray. After that, for example, by filling a fixing material such as a silicone impression material as an example between at least one of the upper jaw impression tray and the lower jaw impression tray, the bite fork portion is formed with the upper jaw impression tray and the lower jaw impression tray. Fix to at least one of the The bite stage part is supported by the lips, and the face midline is recorded on the bite stage part. By supporting the bite stage part with the lips, the bite stage part itself can reproduce the lip joint line.

  Furthermore, if the headband part is mounted on the patient's head so as to be parallel to the prosthetic plane, the sagittal projection angle of the bite stage part should be determined to be parallel to the prosthetic plane. In this state, it waits for the fixing material to harden. At this time, by making a crease at the boundary between the bite fork part and the bite stage part, the headband part can be adjusted to be parallel to the prosthetic plane even after the fixing material is cured. After the fixing material is cured, the front reference point of the artificial dental arch is recorded on the bite stage portion while observing the ridges of the lips. In this manner, the front reference point of the artificial dental arch can be recorded, and at the same time, the upper and lower lip joint line (X axis), the face midline (Y axis), and the line that records the lip richness determined by the operator ( (Z-axis) and virtual occlusal plane (X-Z plane) can be obtained at the same time, the intersection of the three axes that are the basis of 3D design by CAD / CAM and the reference plane that passes through that point Can be obtained. Thereafter, after the bite fork part is fixed to at least one of the upper jaw impression tray and the lower jaw impression tray, the bite stage part and the bite fork part are taken out of the oral cavity without changing the positional relationship between them, and the optical scanner Measure with. At that time, the post unit is designed to superimpose patient image data and impression CAD data in order to design the dental prosthesis from the angle and distance required at the time of manufacturing the dental prosthesis and to confirm the state after completion. It becomes a reference point.

  As a result, when the dental prosthesis is manufactured by CAD / CAM, the front reference point can be recorded simultaneously with the impression acquisition and the jaw position acquisition. That is, the dental prosthesis can be completed without performing the conventional work of correcting the excess or deficiency of the lip side surface of the occlusal wall of the occlusal floor. For this reason, it is possible to reduce the burden on the patient and the operator, and to assist in designing the dental prosthesis and confirming its completeness.

  A dental prosthesis manufacturing method according to claim 2 of the present invention is the method for producing a dental prosthesis, after taking an impression using at least one of an upper jaw impression tray and a lower jaw impression tray, Attaching a bite fork part attached to the bite stage part in the oral cavity and fixing the bite fork part to at least one of the upper jaw impression tray and the lower jaw impression tray; and the bite stage part And attaching the head band part of the dental prosthesis manufacturing apparatus to the head so as to be parallel to the prosthetic plane, and the bite stage part. And determining the sagittal projection angle of the headband portion at the boundary between the bite fork portion and the bite stage portion. A crease that can be adjusted to be parallel to the target plane, a step of writing a front reference point of the artificial dental arch on the bite stage while observing the ridges of the lips, and the extraoral The bite stage part and the bite fork part are taken out without changing the positional relationship between them, and fixed by measuring with an optical scanner, and the post part of the dental prosthesis manufacturing apparatus is subjected to image data and impression CAD data. And a step of producing a dental prosthesis as a reference point for superposition.

  According to the above method, after taking an impression using at least one of the upper jaw impression tray and the lower jaw impression tray according to a well-known normal method, the bite stage portion of the dental prosthesis manufacturing apparatus, A bite fork portion attached to the bite stage portion is mounted in the oral cavity, and the bite fork portion is interposed between at least one of the upper jaw impression tray and the lower jaw impression tray. After that, for example, by filling a fixing material such as a silicone impression material as an example between at least one of the upper jaw impression tray and the lower jaw impression tray, the bite fork portion is formed with the upper jaw impression tray and the lower jaw impression tray. Fix to at least one of the Then, the bite stage part is supported by the lips, and the face midline is written on the bite stage part. By supporting the bite stage part with the lips, the bite stage part itself can reproduce the lip joint line.

  Furthermore, if the headband part is mounted on the patient's head so as to be parallel to the prosthetic plane, the sagittal projection angle of the bite stage part should be determined to be parallel to the prosthetic plane. In this state, it waits for the fixing material to harden. At this time, by making a crease at the boundary between the bite fork part and the bite stage part, the headband part can be adjusted to be parallel to the prosthetic plane even after the fixing material is cured. After the fixing material is hardened, the front reference point of the artificial dental arch is entered on the bite stage while observing the ridges of the lips. In this manner, the front reference point of the artificial dental arch can be recorded, and at the same time, the upper and lower lip joint line (X axis), the face midline (Y axis), and the line that records the lip richness determined by the operator ( (Z-axis) and virtual occlusal plane (X-Z plane) can be obtained at the same time, the intersection of the three axes that are the basis of 3D design by CAD / CAM and the reference plane that passes through that point Can be obtained. Thereafter, after the bite fork part is fixed to at least one of the upper jaw impression tray and the lower jaw impression tray, the bite stage part and the bite fork part are taken out of the oral cavity without changing the positional relationship between them, and the optical scanner Measure with. At that time, the post unit is designed to superimpose patient image data and impression CAD data in order to design the dental prosthesis from the angle and distance required at the time of manufacturing the dental prosthesis and to confirm the state after completion. It becomes a reference point.

  As a result, when the dental prosthesis is manufactured by CAD / CAM, the front reference point can be recorded simultaneously with the impression acquisition and the jaw position acquisition. That is, the dental prosthesis can be completed without performing the conventional work of correcting the excess or deficiency of the lip side surface of the occlusal wall of the occlusal floor. For this reason, it is possible to reduce the burden on the patient and the operator, and to assist in designing the dental prosthesis and confirming its completeness.

  As described above, according to the present invention, when a dental prosthesis is manufactured by CAD / CAM, the front reference point of the artificial dental arch can be recorded simultaneously with impression acquisition and jaw position acquisition.

It is a conceptual diagram which shows the state which mounted | wore the patient with the dental prosthesis manufacturing apparatus which concerns on one Embodiment of this invention. It is a top view which shows the dental prosthesis manufacturing apparatus which concerns on one Embodiment of this invention.

Next, an embodiment of the present invention will be described with reference to FIGS.
In the drawings, members (components) having the same or corresponding functions are denoted by the same reference numerals and description thereof is omitted as appropriate. In these drawings, an arrow UP appropriately shown indicates the upper side of the apparatus, and an arrow FR indicates the front side of the apparatus.

  As shown in FIGS. 1 and 2, the dental prosthesis manufacturing apparatus 10 according to this embodiment includes a bite stage unit 12, a bite fork unit 14, an anterior post unit 16 as a post unit, and a headband unit 18. Yes.

  As shown in FIG. 2, the bite stage portion 12 has a trapezoidal shape with a width in the left-right direction narrowing from the front end 12A toward the rear end 12B in a plan view seen from above. Further, as shown in FIG. 1, the bite stage unit 12 can be mounted in the oral cavity of the patient 20 and can be supported by the lip of the patient 20 while being mounted in the oral cavity of the patient 20. have. Further, the bite stage unit 12 can enter the front reference point of the artificial dental arch.

  As shown in FIG. 2, the bite fork portion 14 has a bifurcated shape in a substantially V shape from the front end 14 </ b> A toward the rear end 14 </ b> B in a plan view seen from above, and the front end 14 </ b> A is the bite stage portion. 12 is attached to the rear end 12B. As shown in FIG. 1, the bite fork 14 has a structure in which at least one of an upper jaw impression tray and a lower jaw impression tray (not shown) can be fixed in the oral cavity of the patient 20.

  As shown in FIG. 1, the anterior post portion 16 is a rod having a circular cross section with the vertical direction as the longitudinal direction, and the central portion 16 </ b> A in the longitudinal direction (vertical direction) Is attached to the central portion 12C in the width direction. In addition, the anterior post unit 16 plans and designs a dental prosthesis from the angle and distance required when manufacturing the dental prosthesis, and confirms the completed state of the patient 20 in order to confirm the state after completion. Bow: Front of the face) This is a reference point for superimposing patient image data such as photographs and radiographs and impression CAD data.

  As shown in FIG. 2, the headband portion 18 has a ring shape when viewed from above, and the front end portion 18 </ b> A is attached to the center portion 12 </ b> C in the left-right width direction on the lower surface of the front end 12 </ b> A of the bite stage portion 12. ing. The headband portion 18 is attached to the bite stage portion 12 so that the attachment angle can be changed. For this reason, as shown in FIG. 1, with the bite stage part 12 and the bite fork part 14 mounted in the oral cavity of the patient 20, the headband part 18 is placed on the outer peripheral part of the head 20 </ b> A of the patient 20. It can be mounted so as to be parallel to the target plane. Note that the sagittal plane projection angle of the bite stage unit 12 is determined by mounting the headband unit 18 on the patient's head so as to be parallel to the prosthetic plane.

(Action / Effect)
Next, the operation and effect of this embodiment will be described.
First, after taking an impression using an upper jaw impression tray and a lower jaw impression tray in accordance with a well-known normal method, when obtaining a jaw position, a bite stage portion of the dental prosthesis manufacturing apparatus 10 12 and the bite fork part 14 are inserted into the oral cavity of the patient 20. At this time, the bite fork part 14 is interposed between the upper and lower jaw impression trays, and as an example, a fixing material such as a silicon impression material is filled between the bite fork part 14 and the upper and lower jaw impression trays. Thus, the bite fork part 14 and the upper and lower jaw impression tray are fixed.

  Next, as shown in FIG. 1, the patient 20 is in a physiologically resting state with the bite stage part 12 and the bite fork part 14 of the dental prosthesis manufacturing apparatus 10 mounted in the oral cavity of the patient 20. The upper and lower lips are closed lightly to support the bite stage 12 with the lips. Thereby, the bite stage part 12 itself can reproduce the lip joint line.

  In this state, the headband unit 18 is mounted on the head 20A of the patient 20 so as to be parallel to the prosthetic plane with respect to the bite stage unit 12, and the hardening of the fixing material is awaited.

  In the present embodiment, after the fixing material is cured, the folds at the boundary between the bite fork part 14 and the bite stage part 12 are folded so that the bite stage part 12 is parallel to the prosthetic plane. Adjust the angle. Further, after the angle adjustment, the angle of the fold is fixed with a room temperature polymerization resin, and the sagittal plane projection angle of the bite stage unit 12 is determined. Thereby, the bite stage part 12 itself can reproduce a virtual occlusion plane.

  Then, the front reference point of the artificial dental arch is recorded on the bite stage unit 12 while waiting for the fixing material to harden and observing the ridges of the lips. Finally, the face midline is recorded on the bite stage 12. By the above operation, not only the front reference point but also the virtual occlusal plane can be obtained at the same time.

  Next, the dental prosthesis manufacturing apparatus 10 is removed from the patient 20 together with the upper and lower jaw impression trays for which impression acquisition and occlusion acquisition have been completed by the above method. At this time, the bite stage part 12 and the bite fork part 14 can be taken out of the oral cavity without changing the positional relationship in the oral cavity. As a preliminary preparation for optical measurement, a small amount of the entered front reference point is deleted with a dental round bar so that the front reference point can be optically measured.

  Thereafter, the upper and lower jaw impressions and the dental prosthesis manufacturing apparatus 10 are collectively measured with an optical scanner, and the file is saved in the STL format. Further, the CAD software can reproduce the front reference point and the virtual occlusal plane of the artificial dental arch of the patient 20 by opening this file. Furthermore, using the anterior post portion 16 which is the front reference point, the patient's image data such as a photograph of the patient 20 taken in advance (seibo: front face) and X-ray photograph and CAD data of the impression are obtained. Can be overlaid in CAD software.

  As described above, in the dental prosthesis manufacturing apparatus 10 of the present embodiment, the upper and lower lip joint line, the face midline, the line in which the lip richness determined by the operator is recorded back and forth, and the virtual occlusal plane 4 You can obtain all the items at the same time to obtain the jaw position. Further, the bite fork portion 14 can be fixed to the upper and lower jaw impression tray, and based on this, the front reference point that can be used for the artificial tooth arrangement can be reproduced on the CAD software.

  As a result, when a dental prosthesis is manufactured by CAD / CAM, the front reference point of the artificial dental arch can be recorded at the same time as impression acquisition and jaw position acquisition. The manufacturing method of the dental prosthesis can be simplified and its economic efficiency can be improved.

  That is, conventionally, the front reference point of an artificial dental arch is, for example, in the case of a complete denture, the excess or deficiency of the lip side of the occlusal levee made with dental wax or the like, the lip augmentation, the patient's request, or the old denture It was decided by a very time-consuming work to correct by trial and error while also referring. However, in the dental prosthesis manufacturing apparatus 10 of the present embodiment, the front reference point of the artificial dental arch is simply and accurately defined, so that the dental prosthesis can be manufactured by CAD in a three-dimensional manner. New methods can be added to define the location. Furthermore, using X-ray digital images such as X-ray panoramic photographs and CT scans, digital color images of models and impression surfaces, and modeled 3D computer graphics, the whole image is formed on the layers of these images. Is also possible. In this way, knowing the state of the dental prosthesis after completion or post-operative is to simulate the process up to the best clinical results, and the problems that must be individually addressed through this experience, This is an extremely important process that helps to consider issues that need to be solved in advance and provide accurate clinical diagnosis and objective instructions to the producer. Furthermore, by using the dental prosthesis manufacturing apparatus 10 of the present embodiment, anyone can perform this process, which has conventionally had excellent diagnostic ability and trial and error of skilled techniques, using CAD.

(Other embodiments)
While the present invention has been described in detail with respect to specific embodiments, the present invention is not limited to the above-described embodiments, and various other embodiments are possible within the scope of the present invention. It will be apparent to those skilled in the art.

10 Dental prosthesis production device 12 Bite stage part 14 Bite fork part 16 Anterior post part (post part)
18 Headband part

Claims (2)

A bite stage unit that can be mounted in the oral cavity of a patient and has a size and thickness that can be supported by the lips in a state of being mounted in the oral cavity, and can enter the front reference point of the artificial dental arch When,
It is attached to the bite stage part, can be fixed to at least one of the upper jaw impression tray and the lower jaw impression tray in the oral cavity, and can be taken out of the oral cavity without changing the positional relationship with the bite stage part. A bite fork part that can
A post portion attached to the bite stage portion and serving as a reference point for superimposing the patient image data and impression CAD data;
A headband portion that is attached to the bite stage portion and can be worn parallel to a prosthetic plane on the patient's head in a state where the bite stage portion and the bite fork portion are worn in the oral cavity. When,
A dental prosthesis production device having After taking an impression using at least one of the upper jaw impression tray and the lower jaw impression tray, the bite stage part of the dental prosthesis manufacturing apparatus and the bite fork part attached to the bite stage part are placed in the oral cavity. And fixing the bite fork part to at least one of the upper jaw impression tray and the lower jaw impression tray;
Supporting the bite stage part with a lip and writing a face midline on the bite stage part;
Mounting the headband part of the dental prosthesis manufacturing apparatus on the head so as to be parallel to the prosthetic plane, and determining the sagittal projection angle of the bite stage part to be parallel to the prosthetic plane; ,
Forming a crease at the boundary between the bite fork part and the bite stage part to allow the headband part to be adjusted parallel to the prosthetic plane;
Filling the front reference point of the artificial dental arch on the bite stage portion while observing the lip richness;
Taking out the bite stage part and the bite fork part outside the oral cavity without changing the positional relationship between them, and fixing with an optical scanner,
Using the post portion of the dental prosthesis production apparatus as a reference point for superimposing image data and impression CAD data, and producing a dental prosthesis;
A dental prosthesis manufacturing method comprising:

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