JPH0551301B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION FIELD OF INDUSTRIAL APPLICATION The present invention relates to a push spoon (also referred to as an impression tray) for doctors.

Prior Art and Problems to be Solved by the Invention The impressions taken by dentists must reproduce the condition of the patient's oral cavity as completely as possible, and the reconstructed model made from the impression must be able to fit without modification. Must be. In dentistry, for example, when making dentures, models of teeth and jaws are often required. To create this model, an impression of one jaw is made using a plurality of pressing spoons. In practice, the embossing, the mesh taking to define the meshing position and the meshing height, and the model assembly are usually carried out in several stages. That is, first one impression is made from the upper jaw or the lingual jaw, followed by a bite sampling using a material that hardens in the oral cavity. Next, the jaw model is fixed in an occlusal simulator, a so-called articulator, in the correct occlusal position to allow lateral occlusion and forward movement, and occlusion adjustment is performed. The models can be articulated according to average values or after embossing, and an adapted transfer adjustment of the facial arch (facial curvature) is carried out before the plaster model is created and articulated.

The plaster model is made from a mold in the laboratory. Continue to use the facial arch to improve the upper dentition (maxilla).
The model is placed in the articulator and then the lower dentition (mandibular) model is placed in its correct three-dimensional position by matching the upper and lower dentition (upper and lower jaw). However, it is often the case that the model is simply adjusted according to the average value without facial arch transfer.
These known techniques include the aforementioned multiple work steps,
In other words, it takes a considerable amount of time because it is necessary to take molds of the upper and lower jaws, take bite measurements, and in some cases, transfer facial arches. A further problem, needless to say, is that the fitted model often does not accurately reproduce the condition of the patient's oral cavity. This kind of thing can be done by stamping (or impression)
Or, this may occur if the plaster model cannot be correctly fitted into the oral cavity due to slight inaccuracies, or if there is an error in the fitting itself. The result is often a high interlocking height of the denture or bridge or crown, which requires laborious grinding within the patient's mouth. Press-type spoons that can be used to take molds with their mouths closed are also already known. In this case, it is possible to determine the engagement position at the same time as stamping. Of course, these hitherto known spoons (or trays) are only suitable for making impressions of unilateral bands of teeth, or in cases of severe tooth loss or jaws with no teeth at all. , is for taking an impression of the entire jaw. In the case of the last-mentioned push spoon, the entrance frame and the oral frame are fixedly connected in the dental zone by means of a connecting rod, so that they cannot be used in jaws where virtually all of the teeth are still present. .

An important object of the invention is therefore to develop a molded spoon for dentists in which molding with the mouth closed is possible even when all the teeth remain.

Means for Accomplishing the Problem In order to solve this problem, the push-type spoon proposed by the present invention is characterized in that the entrance frame and the oral cavity frame are integrally and immovably connected by the posterior molar rod. be. As an extension of the posterior molar rod, it is preferable to extend a bead integral with each frame along the inner surfaces of both the entrance and oral cavity frames, that is, the surface defining the space for receiving the upper and lower tooth rows. The spoon will help hold the impression material. Instead of beads, other impression mass retention means may be used, such as internal perforations. The impression is carried out by a double mixing process. In that case, the patient must continuously bite their teeth in the normal occlusal position while the impression material hardens. During this time, the upper and lower jaws are positioned three-dimensionally in the correct position relative to each other. Make sure to bite through the contact points of the impression material. After the impression material has hardened, the spoon is removed from the patient's mouth.

The type of model manufacturing and model assembly differs somewhat from the usual type. In this case, if the impression material removed from the impression spoon is then filled in the tray again with the impression mass in the dental laboratory in order to create an immovable model to which it is to be fixed for subsequent articulation. , is the simplest. When making a saw model, it is necessary to insert the well-known "dowel pin" into the uncured plaster. The upper and lower jaws are cast sequentially, but the plaster cast is not removed from the spoon. The plaster part is injected from the contact point into the corresponding jaw through the molding part.
After curing, it is removed before the second jaw is cast.

The model inside the spoon is then fitted into the articulator with a checking pedestal according to the average value. Next, use the check pedestal to check whether the assembly was done correctly. Only then is the model removed from the mold spoon.

For the purpose of pursuing accuracy, when assembling the model into the articulator in relation to the cranium, after the impression material has hardened, the facial arch means is placed on the patient and the round rod fixed to the handle of the push spoon is used. Screwed down. Next, the fixing screw of the round bar is removed from the handle,
The face arch means is removed together with the round bar. The push spoon is then removed from the patient's mouth.
Separating the round bar screwed to the facial arch means from the pressing spoon has two major advantages. That is, 1. With this, the model can be cast without any problem. If not separated, the face arch means fixed to the molding spoon would significantly interfere with the casting operation.

2. When removing the spoon and the facial arch means at the same time, or when casting a model, the risk of the facial arch means being distorted by the vibrator is prevented. The facial arch means must be handled very carefully, otherwise an accurate copy of the tooth impression cannot be guaranteed.

The model is manufactured as explained above. During assembly of the model, the facial arch means are inserted into the assembly aid and aligned with the upper part of the articulator. The round bars are covered with plaster to prevent them from falling. Next, attach the spoon together with the model to the round rod again and screw it in place. The upper jaw model is now placed in an articulator and directed to an assembly board with a check seat. The retaining screws are then removed and
The round rod is removed from the spoon handle again. The lower jaw model is then plastered to the lower mounting board in the customary manner. Next, use the check pedestal to check whether the model has been assembled correctly. Only after this check is the model removed from the impression. Based on this procedure, the model accurately reproduces the condition inside the patient's mouth with a continuous normal occlusal position. Therefore, the engagement height will not be too high due to model inaccuracies or assembly errors.

Embodiment The push-type spoon consists of an entrance frame 1 and an oral cavity frame 2 whose cross-sectional shape is approximately U-shaped when cut in the left-right direction, and both frames are integrally and immovably connected by a posterior molar bridge 3. There is. As can be understood from FIG. 3, the posterior molar rod 3 stands up from the oral cavity frame 2 in an inclined posture, and has a curved shape (the first (see Figure or Figure 2). Furthermore, molar posterior rod 3
is equipped with impression material retention beads 4a, 4b extending along the inner surfaces of both the entrance and oral cavity frames 1, 2, that is, the surfaces defining the space for receiving the upper and lower tooth rows, and the retention beads are It is an extension of the posterior rod 3 and is formed integrally with both the entrance and oral cavity frames 1 and 2. This holding bead 4b is
It is located at a slightly lower level than the top surface of the oral cavity frame 2 which is curved into a bulging shape.

The space behind the innermost molars in the oral cavity is extremely narrow and curved. The space is defined by the lingual protuberance of the maxilla, with a protruding portion extending bucally to the mandible. The curved molar posterior rod 3
fits successfully into this curved, narrow space, regardless of whether or not the innermost molar is missing.
The press-shaped spoon of the present invention can be optimally installed in the oral cavity. Moreover, according to the structure in which the molar posterior rod 3 is formed integrally with the entrance frame 1 and the oral cavity frame 2, the rod is not integrated with both frames but is adjustable, such as a tooth row in a push-type spoon. Factors that affect model accuracy are eliminated.

A handle 5 is protruded from the outer surface of the entrance frame 1, and a round bar 6 is removably inserted into the handle 5. The round bar 6 is fixed in a reproducible position by engaging its positioning conical protrusion 7 with the engaging portion of the handle 5 and using a fixing screw 8. In order to easily securely attach the round bar 6 to the handle 5, it has been confirmed that it is preferable to configure the fixing screw 8 to be positioned diagonally forward and inside the handle 5 as shown in the figure. .

Effects of the Invention As is clear from the above explanation, according to the present invention, the following effects can be obtained.

Because the posterior molar rod integrally and immovably connects the entrance frame and the oral cavity frame, the posterior molar rod is not integrated with both frames, but is adjustable, making it possible to create a dental model similar to that of a conventional push-type spoon. Factors that affect accuracy are eliminated.

The posterior molar rod rises from the oral cavity frame in an inclined position and curves around the back side of the innermost tooth, allowing it to fit successfully into the curved and narrow space behind the molar, resulting in the best The press-shaped spoon of the present invention can be optimally installed in the oral cavity regardless of whether or not the molars of the teeth are missing, and in this installed state, the patient can chew with normal occlusion.

The space defined by the entrance frame and the oral cavity frame can receive the upper and lower teeth, and since the component parts of the push spoon are not structured to cover the articulator, normal occlusion within this space is guaranteed. Ru.

along the inner surface of both the entrance and oral frames;
The structure with the bead as an extension of the posterior rod of the molar ensures reliable retention of the impression material by the pressing spoon.

In a structure in which a "handle" is attached to the outer surface of the entrance frame, a round bar for transcription by the facial arch means is fixed to the "handle" in a reproducible and removable manner, so that the patient's facial arch can be adjusted. After the transfer, the facial arch means is removed from the "handle" along with the round rod, and then, when reproducing normal occlusion using a dental model using an articulator,
By fixing the round rod again to the "handle" and using the facial arch means attached to the round rod, normal occlusion can be reproduced. In addition, by employing a structure in which the facial arch means can be attached to and detached from the press spoon in this manner, the model casting work can be easily performed, and furthermore, the creation of a precise dental model is guaranteed.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a push-type spoon according to the present invention;
FIG. 2 is a plan view of a press-type spoon according to the present invention, and FIG. 3 is a sectional view taken along the line -- in FIG. 1... Entrance frame, 2... Oral frame, 3
...Molar posterior rod, 4a, 4b...Retention bead, 5
...Spoon handle, 6...Round bar, 7...Conical protrusion, 8...Fixing screw.

Claims (1)

[Scope of Claims] 1. An entrance frame 1 having a curved shape that conforms to the outer contours of the upper and lower tooth rows in a dentist's press spoon for molding the entire upper and lower jaws at the same time.
and the space for receiving the upper and lower tooth rows is defined by the entrance frame 1.
an oral cavity frame 2 that covers the tongue from the upper surface side; and a molar posterior rod 3 that integrally and immovably connects the entrance frame 1 and the oral cavity frame 2; This spoon for dentists is characterized in that it stands up from an oral cavity frame 2 in an inclined position and curves around the back side of the innermost tooth. 2 a bead 4a on which the press spoon extends along the entrance and the inner surface of both the oral cavity frames, that is, a surface defining a space for receiving the upper and lower rows of teeth;
4b, and the bead is attached to the posterior molar rod 3.
2. The dentist's press spoon according to claim 1, wherein the spoon is an extension of the mouth frame and is formed integrally with both the entrance and oral cavity frames. 3. The press spoon is provided with a handle 5 attached to the outer surface of the entrance frame, into which a round bar for transcription by the facial arch means is inserted, and is removable at a reproducible position. 3. The dentist's press spoon according to claim 1 or 2, wherein the spoon is fixed to. 4. The round bar 6 is fixed to the handle 5 by a fixing screw 8, and is reproducibly positioned by the conical member on the round bar 6 and the corresponding part of the handle 5. The dentist's press spoon according to claim 3, characterized in that: