A device for assisting in recording jaw relation of patients with missing teeth and a manufacturing method thereof

Abstract

The application discloses a device for assisting in recording jaw position relationship of a tooth loss patient and a manufacturing method thereof, and belongs to the technical field of stomatology, which comprises a tissue surface of a maxillary base plate and a maxillary surface of a patient, a tissue surface of a mandibular base plate and a mandibular surface of the patient, a plurality of fixing nails located at alveolar crest top, a plurality of fixing nails are arranged on the maxillary base plate and the mandibular base plate at intervals, and a supporting column is fixedly arranged on the mandibular base plate and located at bilateral posterior teeth of the mandibular base plate. The device for recording jaw position relationship of the tooth loss patient provided by the application forms effective support in the posterior tooth area, simplifies a clinical operation process and improves the quality of jaw position relationship recording.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of stomatology, and particularly relates to a device for assisting jaw position relationship recording of a patient with tooth loss and a manufacturing method thereof. BACKGROUND

[0002] Determination and acquisition of the jaw position relationship is a very important link in the treatment of removable denture repair. When the bilateral upper and lower posterior teeth are missing (or all teeth are missing), the stable occlusion relationship cannot be maintained. The prior art solution first needs to obtain the impression of the patient and cast a plaster model, and then a bite plate is made on the plaster model to determine and record the occlusion relationship.

[0003] The bite plate is composed of a temporary base and a bite dam.

[0004] The temporary base can be made of a wax sheet or a resin material (light-cured resin or self-curing resin) to cover the tissue surface of the edentulous area and provide a certain retention effect, and the bite dam is used to determine the position and height of the teeth.

[0005] The bite dam is made of wax. The wax sheet is softened on an alcohol lamp, rolled into a strip, and bent into a horseshoe shape (arch shape). The softened wax has adhesion and can be adhered to the surface of the upper and lower temporary bases. Then the shape is trimmed to form the dental arch shape. In actual operation, the upper and lower temporary bases are first prepared, and then the maxillary bite dam is made. Before the wax hardens, the bite plane is determined with the aid of a bite plane plate. The position of the bite plane is generally referred to the facial anatomical landmarks and the occlusal surface position of the remaining teeth (if there are remaining teeth). After the maxillary bite dam cools and hardens, the mandibular bite dam is made. Before the softened lower bite dam cools and hardens, it is placed in the patient's mouth. The patient is instructed to perform the occlusion action, so that the lower bite dam and the upper bite dam are occluded to the appropriate vertical distance and centric position. Then the occlusion position relationship of the upper and lower bite dams is recorded by some methods or techniques (such as marking or adhering the upper and lower bite dams in the occlusion state to lock the relative position of the upper and lower bite dams when occluded). Finally, the position relationship is transferred to the technician for subsequent production.

[0006] The occlusion position of the patient with more tooth loss and unstable occlusion relationship has a certain randomness, that is, multiple occlusions may not be completely occluded in the fixed position. The general practitioner will let the patient's mandible retract through a series of methods (such as the tongue rolling and licking method, posterior tooth occlusion method, etc.). When the mandible retracts as much as possible, its position will be limited by the anatomical structure of the glenoid fossa, and it will be occluded to the approximate left and right centric relationship position. As an improvement, placing a gothic arch tracing device in the upper and lower bite plate is conducive to obtaining the accurate mandibular retraction position. However, this requires special accessories and complex operation steps, further increasing the complexity of the operation. SUMMARY

[0007] To solve the above problems, the present application adopts the following technical solutions:

[0008] An apparatus for assisting jaw position relationship recording of a patient with missing teeth comprises:

[0009] An upper jaw base plate, a tissue surface of which is fitted to the upper jaw surface of the patient;

[0010] A lower jaw base plate, a tissue surface of which is fitted to the lower jaw surface of the patient;

[0011] A plurality of fixing pins at the top of the alveolar ridge, the plurality of fixing pins being arranged on the upper jaw base plate and the lower jaw base plate at intervals;

[0012] A support column, which is fixedly arranged on the lower jaw base plate and located at the bilateral posterior teeth of the lower jaw base plate.

[0013] Further, the upper jaw base plate and the lower jaw base plate are both provided with an avoiding position area to cooperate with the remaining teeth of the patient.

[0014] Further, the diameter of the fixing pin is 1-2 mm, and the height is 2-5 mm.

[0015] Further, the shape of the fixing pin is one of a cylinder, a cone or a square.

[0016] Further, the interval between adjacent fixing pins is 1-5 mm.

[0017] Further, the support column is conical or cylindrical, the top surface of the support column has a diameter of 4-6 mm and a height of 5-10 mm.

[0018] Further, the support column is located at the corresponding position of the first premolar to the second molar of the lower jaw.

[0019] Further, the material of the base plate is one of resin, PEEK or metal material.

[0020] A manufacturing method of an apparatus for assisting jaw position relationship recording of a patient with missing teeth, which adopts any of the apparatuses for jaw position relationship recording of a patient with missing teeth, comprises the following steps:

[0021] S10, obtaining three-dimensional scanning data of the jaw surface;

[0022] S20, drawing a temporary base plate edge line along the range to be covered by the denture in the three-dimensional reverse engineering software;

[0023] S30, cutting and removing the area outside the edge line;

[0024] S40, carry out necessary buffering and filling concave operation;

[0025] S50, form a substrate along the normal direction;

[0026] S60, operator interaction adjustment and definition of the normal direction of the plane;

[0027] S70, add a plurality of retention pins on the upper jaw substrate and the lower jaw substrate, wherein the plurality of retention pins are added at the top of the alveolar ridge, the spacing between adjacent retention pins is 1-5mm, the substrate is fused with the retention pin, and is merged through Boolean operation;

[0028] S80, add a support column on the bilateral posterior tooth region of the lower jaw substrate, wherein the support column is located at the corresponding position of the first premolar to the second molar of the lower jaw, the upper jaw substrate, the lower jaw substrate, the retention pin and the support column are fused, and are merged through Boolean operation;

[0029] S90, import the data completed in step S80 into a three-dimensional printer, and print using PLA material in FDM process; or, print using light-cured resin material in SLA or DLP process.

[0030] Beneficial effects:

[0031] The device for recording the jaw position relationship of the patient with tooth loss provided by the application has the support column forming effective support in the posterior tooth region, simplifies the clinical operation process, and improves the quality of the jaw position relationship recording.

[0032] The bilateral support column in the application has small volume and is located at the bilateral posterior tooth region, can simply and effectively guide the patient to perform posterior tooth occlusion, and thus avoids the jaw position relationship error caused by the forward extension or deflection of the lower jaw during occlusion.

[0033] The bilateral support column in the application is used for supporting the posterior tooth occlusion and has the effect of automatically adjusting the balance of the bilateral support.

[0034] The diameter of the top of the lower jaw support column in the application can effectively support the posterior tooth occlusion of the patient, has the aforementioned occlusion self-balancing effect, avoids the situation that when the diameter is too small, the pressure is large, the upper jaw wax dam is deformed even under the occlusion of small force, the bilateral support is in contact, and it is difficult to stop the deformation of the wax dam and the continuous embedding of the support column, so that stable occlusion support cannot be obtained; when the diameter is too large, the pressure is small, the wax dam is not deformed even under the large pressure under the contact of the unilateral support column, and self-adaptive adjustment cannot be realized, and if the patient increases the occlusion force, the upper jaw base may be tilted due to the excessive force breaking the adsorption force of the upper jaw base. BRIEF DESCRIPTION OF DRAWINGS

[0035] Figure 1 It is a front view of the upper jaw base of the application;

[0036] Figure 2 is a schematic view of the upper base plate of the present application from the bottom;

[0037] Figure 3 is a schematic view of the upper base plate of the present application from the bottom;

[0038] Figure 4 is a schematic view of the lower base plate of the present application from the front;

[0039] Figure 5 is a schematic view of the lower base plate of the present application from the bottom;

[0040] Figure 6 is a schematic view of the lower base plate of the present application from the bottom.

[0041] wherein 1, upper base plate; 2, lower base plate; 3, fixing pin; 4, support column; 5, tissue surface. DETAILED DESCRIPTION

[0042] Example 1

[0043] Reference Figures 1-6 A device for assisting in recording the jaw position relationship of a patient with missing teeth, comprising:

[0044] A device for assisting in recording the jaw position relationship of a patient with missing teeth, comprising:

[0045] an upper base plate 1, the tissue surface 5 of the upper base plate 1 being fitted to the upper jaw surface of the patient;

[0046] a lower base plate 2, the tissue surface 5 of the lower base plate 2 being fitted to the lower jaw surface of the patient, and the upper base plate 1 and the lower base plate 2 each being provided with an avoidance position area to cooperate with the remaining teeth of the patient;

[0047] a plurality of fixing pins 3 located at the top of the alveolar ridge, the plurality of fixing pins 3 being arranged at intervals on the upper base plate 1 and the lower base plate 2, the fixing pins 3 having a diameter of 1-2 mm and a height of 2-5 mm; the fixing pins 3 being used to assist in fixing the wax dam of the upper jaw and the recording material of the lower jaw; the shape of the fixing pins 3 being one of cylindrical, conical, and square, and the spacing of the fixing pins 3 being 1-5 mm.

[0048] Preferably, the fixing pins 3 are conical, with a bottom radius of 1 mm, a top radius of 0.5 mm, and a height of 3 mm.

[0049] a support column 4, the support column 4 being fixedly arranged on the lower base plate 2 and located at the posterior teeth of the lower base plate 2 on both sides, the support column 4 being one of conical and cylindrical, the support column 4 being located at the corresponding position of the lower jaw 4-7 (the first premolar to the second molar), and the top surface of the support column 4 having a diameter of 4-6 mm and a height of 5-10 mm.

[0050] Preferably, the support column 4 is located in the area corresponding to the positions of the 5th and 6th premolars and the first molar.

[0051] Preferably, the support column 4 is conical, with a bottom radius of 3 mm and a top radius of 2.5 mm, and a height of 8 mm.

[0052] In other embodiments, the support column 4 can also be of other shapes, but the top surface contact area should be equivalent to that of a circle with a diameter of 4-6 mm.

[0053] In this embodiment, the bilateral support column has a small volume and is located in the bilateral posterior tooth region, which can simply and effectively guide the patient to perform posterior occlusion, thereby avoiding errors in the jaw relationship caused by mandibular protrusion or deviation during occlusion.

[0054] In this embodiment, the diameter of the top of the mandibular support column can effectively support the patient's posterior occlusion, thereby achieving the aforementioned occlusion self-balancing effect.

[0055] In actual implementation, when the upper wax ridge is completed and the upper and lower wax ridges are placed in the patient's mouth for occlusion, because the patient's dental and jaw surfaces are not flat, the left and right heights and the interarch space are often asymmetric, and in the initial occlusion state, one side of the support column is usually in contact with the surface of the upper wax ridge, and the other side is still a certain distance away. At this time, the occlusion force is concentrated on one side of the support column, and the force is relatively large. Since the wax ridge is not rigid, it deforms under the action of a relatively large pressure. After multiple occlusions, a dent is formed, and the support column is embedded therein. Until the other side of the support column also contacts the wax ridge, the bilateral support columns evenly distribute the occlusion pressure, the pressure of the first-contacted support column decreases, and the wax ridge can withstand the pressure without deforming, thereby achieving balance and stability of the bilateral support.

[0056] To better achieve this effect, the patient can be instructed to lightly bite first in actual operation, at which time the force is small, and even if only one side is supported, the wax ridge does not deform. Subsequently, the patient is gradually instructed to increase the occlusion force, so that the first-contacted side of the wax ridge begins to deform, the support column slowly embeds, and this force is maintained until the other side also contacts. At this time, the bilateral pressure is balanced, the pressure of the first-contacted side of the support column decreases, and the embedding is stopped, thereby achieving stability.

[0057] In this embodiment, the upper base plate 1 and the lower base plate 2 are made of one of resin, PEEK, and metal, which are easy to obtain and are commonly used materials in the oral cavity, and can all provide sufficient strength to bear the slowly occluded force of the patient during the recording of the jaw relationship.

[0058] Embodiment 2

[0059] The manufacturing method of the device for assisting in recording the jaw relationship of a patient with missing teeth provided in this embodiment uses the device for assisting in recording the jaw relationship of a patient with missing teeth provided in Embodiment 1, and the method comprises the following steps

[0060] S10, first obtain the dental surface three-dimensional scanning data;

[0061] Preferably, 3shapetrios is selected, and a three-dimensional commercial intraoral scanner is used.

[0062] S20, draw the temporary base edge line along the range to be covered by the denture in the three-dimensional reverse engineering software;

[0063] Preferably, the engineering software is Geomagic.

[0064] S30, cut and remove the area outside the edge line;

[0065] S40, perform necessary buffering, filling, and other operations;

[0066] S50, draw the shell along the normal direction to form the base plate;

[0067] Preferably, the shell drawing distance is 1-3mm.

[0068] S60, the operator interacts to adjust and define the normal direction of the plane;

[0069] S70, add a plurality of retention pins to the maxillary base plate and the mandibular base plate, wherein the plurality of retention pins are added to the alveolar ridge top, the spacing between adjacent retention pins is 1-5mm, the base plate and the retention pin are fused, and are merged by Boolean operation;

[0070] S80, add support columns to the bilateral posterior tooth region of the mandibular base plate, located at the corresponding positions of the mandibular 4-7 (first premolar to second molar) teeth, and fuse the maxillary base plate, the mandibular base plate, the retention pin, and the support column, and merge by Boolean operation;

[0071] Preferably, the support column is located in the region corresponding to the positions of the mandibular 5 and 6 (second premolar and first molar) teeth;

[0072] S90, the above designed data is imported into a three-dimensional printer, PLA (polyactic acid) material is used, FDM (fused deposition manufacturing) process is used for printing, or photocurable resin material is used, SLA or DLP process is used for printing.

[0073] Example 3

[0074] After obtaining the three-dimensional data of the patient's dental surface by intraoral scanning or model scanning, according to the method described in Example 3, the maxillary base plate and the mandibular base plate are respectively recorded as follows:

[0075] First step: after the wax sheet is softened, it is placed on the maxillary base plate for shaping, and the occlusal plane and fullness can be adjusted in the patient's mouth and outside with the help of the occlusal plane plate and the carving knife, and after being satisfied, the wax sheet is cooled to room temperature level with cold water, gas or natural cooling.

[0076] Second step: wear the upper base plate with wax ridge and the lower base plate without wax ridge, ask the patient to occlude the posterior teeth, and the lower support column is occluded on the upper wax ridge, adjust the height of the wax ridge corresponding to the support column on the upper wax ridge, and add or remove the wax ridge locally to adjust the coordination of the vertical distance and the left and right support strength, so that the bilateral lower support columns can contact the upper wax ridge when occluding, and the support strength of the bilateral support columns is balanced, and the upper temporary base plate is stably attached to the upper surface without tilting when occluding.

[0077] Third step: after the vertical distance and horizontal relationship are confirmed to be appropriate, the center line and the corner line are drawn, the jaw recording material is injected between the upper wax ridge and the lower temporary base plate to lock the position of the upper and lower temporary base plates, and the jaw position relationship recording is completed.

[0078] The operation steps of laying the wax ridge on the lower jaw are reduced, and the posterior tooth occlusion guide of the lower support column is effectively realized, which is beneficial to the stable and accurate recording of the jaw position relationship.

[0079] The above is only the preferred embodiment of the present application, and does not limit the technical scope of the present application, so any slight modification, equivalent change and modification of the above embodiment according to the technical essence of the present application still belongs to the scope of the technical solution of the present application.

Claims

1. An apparatus for assisting in the registration of jaw relation records for edentulous patients, characterized in that, Comprise: a maxillary base plate, the tissue surface of which is fitted to the maxillary surface of the patient; a mandibular base plate, the tissue surface of which is fitted to the mandibular surface of the patient; a plurality of fixed pins at the alveolar crest, a plurality of the fixed pins being arranged on the maxillary base plate and the mandibular base plate at intervals; a support column, which is fixedly arranged on the mandibular base plate and is located at the bilateral posterior teeth of the mandibular base plate; 2. The apparatus for recording the jaw relationship of a tooth-loss patient according to claim 1, wherein the support column is conical or cylindrical, the top surface diameter of the support column is 4-6mm, and the height is 5-10mm.

3. The apparatus for recording the jaw relationship of a tooth-loss patient according to claim 1, wherein The maxillary base plate and the mandibular base plate are both provided with an avoidance position area to cooperate with the remaining teeth of the patient.

4. The apparatus for recording the jaw relationship of a tooth-loss patient according to claim 1, wherein The diameter of the fixed pin is 1-2mm, and the height is 2-5mm.

5. The apparatus for recording the jaw relationship of a tooth-loss patient according to claim 1, wherein The shape of the fixed pin is one of cylindrical, conical or square.

6. The apparatus for recording the jaw relationship of a tooth-loss patient according to claim 1, wherein The spacing between adjacent fixed pins is 1-5mm.

7. The apparatus for recording the jaw relationship of a tooth-loss patient according to claim 1, wherein The support column is located at the corresponding position of the first premolar to the second molar of the mandible. The material of the base plate is one of resin, PEEK or metal material.

Images