JPH0529497Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field This invention relates to a condyle tract device for a skull model for dental medical training.

Structure of the Prior Art and its Problems As a cranial model for practicing dentistry, one in which the mandible can be moved to open and close relative to the skull is generally used. However, it is well known that in an actual human skull, the mandible can not only open and close relative to the skull, but also move forward and laterally. Moreover, the forward motion is a translational motion, but the lateral motion is not a translational motion and is complex. The human mandible has so-called articular discs between its left and right ends and the skull, and the mandible is guided by the articular discs. As shown in FIG. 4, when the mandible is moved laterally with respect to the skull, one end A of the mandible moves obliquely forward and inward. The path of movement is called the condylar path, and the inclination angle α is called the sagittal angle. At the same time, the other end B of the mandible moves outward, and the entire mandible moves laterally. The mandible of the traditional cranial model can only open and close, but cannot move forward and sideways, which does not reproduce all the movements of the real human mandible. Therefore, the effectiveness of dental medical training cannot be enhanced, and improvements have been desired.

Purpose of the invention Therefore, this invention was made in response to the above-mentioned conventional demands, and provides a condylar path device that allows the mandible of a cranial model to open/close, forward and lateral movements with respect to the skull. The aim was to reproduce all the movements of the human mandible.

Structure of the invention According to this invention, the left and right sides have a guide groove 6 extending in the length direction, are fixed to the skull 1, and are inclined inwardly toward the front of the skull 1 at a sagittal angle α. A pair of condyle road plates 5L, 5R, a pair of left and right support pin portions 7L, 7R inserted into the guide grooves 6 of each of the condyle road plates 5L, 5R, each of the support pin portions 7L,
7R, and is disposed on the outside of each of the condyle road plates 5L, 5R, and when each of the support pin parts 7L, 7R is at the rear end position of the guide groove 6, each of the condyle road plates 5
A pair of left and right outer flanges 9 that engage with L and 5R
L, 9R and each of the supporting pin portions 7L, 7R, and arranged inside each of the condyle road plates 5L, 5R,
A pair of left and right inner flanges 10L, 10R that engage with the condyle road plates 5L, 5R when the support pin portions 7L, 7R are at the front end positions of the guide groove 6;
A condyle tract device for a cranial model for dental medical training is provided, which includes the mandible 2 fixed to each of the support pins 7L and 7R and indicated.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of this invention will be described. FIG. 1 shows an embodiment of this invention. This skull model is skull 1
and mandible 2. A maxillary stand 3 and a mandibular stand 4 equipped with tooth models are attached to the skull 1 and the mandible 2.

As shown in FIG. 2, this skull model has a pair of left and right condylar road plates 5L and 5R. As shown in FIG. 3, the condylar road plates 5L and 5R are flat plate-like and have guide grooves 6 extending in the length direction. Condyle road plate 5L, 5
R is fixed to the skull 1, inclined at a sagittal angle α, and inclined inward toward the front of the skull 1. The sagittal angle α is 15°.

Furthermore, this skull model has a pair of left and right support pins 7.
The supporting pin portions 7L and 7R are sleeve-shaped bushes that are fitted into a single common rod 8. And each support pin part 7L, 7R
is inserted into the guide groove 6 of each condyle road plate 5L, 5R,
Rotatably and slidably inserted. Further, the pair of left and right outer flanges 9L, 9R and inner flanges 10L, 10R are connected to the respective support pin portions 7L, 7.
R, the outer flanges 9L and 9R are arranged on the outer side of each condyle road plate 5L and 5R, and the inner flange 1
0L and 10R are arranged inside each condylar road plate 5L and 5R. Outer and inner flanges 9L, 9
R, 10L, and 10R are larger than the groove 6 of the condylar road plate 5.

The mandible 2 is fixed and supported by each support pin part 7L, 7R. In this embodiment, the mandible 2 consists of a pair of left and right arms. Then, the nut 11 is screwed onto the rod 8 and tightened, and the mandible 2 is attached to the nut 11 and the support pin parts 7L, 7R.
It is sandwiched between and fixed. Further, a spring 12 is provided between the skull 1 and the mandible 2, and the mandible 2 is elastically biased upward and backward. Therefore, the spring 12 acts as a masticatory muscle for the mandible 2, and the teeth of the mandibular rest 4 can be brought into occlusion with the teeth of the maxillary rest 3. In the occlusal state, the support pin portions 7L, 7R are arranged at the positions shown by solid lines in FIG. 2, and their outer flanges 9L, 9R engage with the guide grooves 6 of the condyle road plates 5L, 5R. Therefore, the mandible 2 is positioned by the condyle road plates 5L, 5R and the outer aflange 9L, 9R, and the mandible 2 is held in a resting position.

Therefore, when practicing dentistry using this cranium model, when the mandible 2 is pulled down by hand,
Each condyle road plate 5L, 5R and each support pin part 7L, 7R
The mandible 2 is guided by the supporting pin parts 7L, 7.
R rotates within the guide groove 6 of the condyle road plates 5L, 5R, and the mandible 2 swings around the supporting pin portions 7L, 7R. Therefore, the mandible 2 can be opened and closed relative to the skull 1.

Furthermore, when the mandible 2 is pulled forward, each support pin part 7L, 7R moves integrally with the mandible 2, and slides along the guide groove 6 of the condylar road plates 5L, 5R. Therefore, the mandible 2 can be moved forward relative to the skull 1. And the support pin part 7L,
When 7R moves to the position indicated by the chain line in FIG.
Its movement is restricted by R, and the mandible 2 is positioned.

Furthermore, when the mandible 2 is returned to the resting position and pushed to the right side, the support pin part 7L is guided by the left outer flange 9L, and the support pin part 7L is moved to the condyle road plate 5L.
slides along the guide groove 6 and moves diagonally forward and inward. Therefore, the left end of the mandible 2 moves diagonally forward and inward. At the same time, the right support pin portion 7R slides within the guide groove 6 of the condylar road plate 5R and moves outward, and the right end of the mandible 2 moves outward. Therefore, the mandible 2 can be moved laterally with respect to the skull 1. When the right support pin 7R moves to the position indicated by the chain line in FIG.
It engages with the guide groove 6 of R, and its movement is restricted by the inner flange 10R. Therefore, the mandible 2 is positioned by the right inner flange 10R and the left outer flange 9L.

Conversely, when the mandible 2 is pushed to the left, the right support pin portion 7R slides along the guide groove 6 of the condylar road plate 5R and moves diagonally forward and inward. At the same time, the left support pin portion 7L slides within the guide groove 6 of the condylar road plate 5L, moves outward, and the mandible 2
moves laterally with respect to skull 1.

Effects of the invention As explained above, according to this invention, the pair of left and right condyle road plates 5L, 5R are fixed to the skull 1.
The condyle road plates 5L and 5R have guide grooves 6 extending in the length direction.
It has a sagittal angle α and inclines inward toward the front of the skull 1. Further, the pair of left and right support pin portions 7L, 7R are inserted into the guide grooves 6 of the respective condylar road plates 5L, 5R, and the pair of left and right outer flanges 9
L, 9R are provided on each support pin portion 7L, 7R, and are arranged on the outside of each condyle road plate 5L, 5R, and a pair of left and right inner flanges 10L, 10R are provided on each support pin portion 7L, 7R.
7R, and arranged inside each condyle road plate 5L, 5R. Then, the mandible 2 is attached to each support pin portion 7L,
Fixed and supported by 7R. Further, according to this invention, when each support pin portion 7L, 7R is at the rear end position of the guide groove 6, each outer flange 9L, 9R engages with each condyle road plate 5L, 5R. Therefore, each condyle road plate 5L, 5R and each outer flange 9L, 9
The mandible 2 is positioned by R, and the mandible 2 can be centered with respect to the skull 1 and held in a resting position, so that the mandible 2 does not move laterally and does not wobble. Furthermore, when the mandible 2 is pulled down by hand, the support pins 7L and 7R rotate within the guide groove 6, allowing the mandible 2 to open and close relative to the skull 1. When the mandible 2 is pulled forward, the support pin parts 7L and 7R slide along the guide groove 6, and the mandible 2 can also be moved forward relative to the skull 1. Furthermore, according to this invention, when each support pin part 7L, 7R is at the front end position of guide groove 6, each inner flange 10L, 10R is connected to each condylar road plate 5.
Engages with L and 5R. Therefore, when the mandible 2 is moved forward relative to the skull 1, each condylar road plate 5L,
5R and the inner flanges 10L and 10R, the mandible 2 is positioned, and the mandible 2 can be centered with respect to the skull 1, so that the mandible 2 does not move laterally and does not wobble. When the mandible 2 is returned to the resting position and pushed to the right or left side, the support pin parts 7L and 7R slide along the guide groove 6, and the mandible 2 can also be moved laterally relative to the skull 1. .

[Brief explanation of the drawing]

Figure 1 is an explanatory diagram showing an embodiment of this invention, Figure 2
The figure is a cross-sectional view of the mandible, condylar road plate, and support pin shown in Figure 1, Figure 3 is a side view of the condylar road plate in Figure 2, and Figure 4 shows the lateral movement of the actual human mandible. FIG. 1... Skull, 2... Mandible, 5L, 5R... Condylar road plate, 6... Guide groove, 7L, 7R... Support pin portion, 9L, 9R... Outer flange, 10L, 10
R...inner flange, α...sagittal angle.

Claims (1)

[Scope of utility model registration request] A pair of left and right condylar road plates 5L, 5R having a guide groove 6 extending in the length direction, fixed to the skull 1, and inclined inwardly toward the front of the skull 1 at a sagittal angle α. , a pair of left and right support pin portions 7L, 7 inserted into the guide grooves 6 of the respective condylar road plates 5L, 5R.
R, and each of the support pin portions 7L, 7R is provided on the outside of each of the condyle road plates 5L, 5R, and when each of the support pin portions 7L, 7R is at the rear end position of the guide groove 6, A pair of left and right outer flanges 9L, 9R that engage with each of the condyle road plates 5L, 5R, and a pair of left and right outer flanges 9L, 9R that are provided on each of the support pin portions 7L, 7R, and each of the condyle road plates 5
L, 5R, each of the support pins 7
When L and 7R are at the front end position of the guide groove 6, they are fixed to and supported by the pair of left and right inner flanges 10L and 10R that engage with the condyle road plates 5L and 5R, and the support pin portions 7L and 7R. A condyle tract device for a cranium model for dental medical training consisting of a mandible bone 2.