JPH0739554A - Occlusal splint - Google Patents

Abstract

PURPOSE:To provide a coolusal splint capable of obtaining smooth masticating motions, a stable attachment feeling, a sense of security during the use, and is excellent in resistance against breaking, by improving a maintaining force to teeth. CONSTITUTION:The occulusal splint comprises a portion from the vicinity of a survy line of teeth to the upper end side of the teech formed out of a hard portion 8 made of a hard resin, and a portion from an external shape line set at a position of 0.5-1.5mm on the side of the dental neck portion from the survey line to the vicinity of the survey line is formed out of a soft portion 9 made of a soft elastic material.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an occlusal splint used for correction and treatment of occlusal origin abnormalities such as temporomandibular disorders and temporomandibular disorders, and for cases requiring occlusal elevation.

[0002]

2. Description of the Related Art Occlusal splints are used to correct occlusion, that is, to restore occlusal contact and to correct lower jaw position, and are attached to the patient's teeth for a certain period of time to remember the current occlusion. Is temporarily blocked to stabilize the masticatory muscle group and temporomandibular joint, and provide rest. It can also be used as a mouth guard and a power plate.

Conventionally, as this type of splint, for example, an acrylic resin which is widely used as a resin for denture base, that is, polymethylmethacrylate (PMM) is used.
For example, a hard resin such as A) is formed as shown in FIG. In addition, JP-A-4-9265
No. 9 discloses a splint having a three-layer structure of soft layer-hard layer-soft layer.

Since the occlusal sprint is always worn in the oral cavity for a certain period of time, usually for several weeks to several months as described above, conversation can be carried out without any trouble during that period.
In addition, the food should not interfere with eating and should be comfortable when worn. Therefore, it must be attached to the teeth with a maintenance force that does not fall off even when the mouth is opened and closed and the tongue is moved. A sufficient occlusal force is added to this even when chewing food, the chewing function is not hindered, and the strength and durability must be such that it is not deformed or damaged even when subjected to occlusal pressure. Furthermore, because it is for treatment, it must be removable at the time of diagnosis,
Removability is also a necessary condition.

However, in the conventional typical structure shown in FIG. 5, since the splint 1 is formed only of hard resin, it is removed from the tooth 2 when it is extended to the undercut portion below the survey line 3 on the side surface of the tooth 2. It is impossible to extend the splint 1 below the survey line because it becomes impossible. Therefore, it is formed so as to cover the portion above the tooth survey line 3, but this reduces the ability to maintain the tooth 2 and is easy to fall off, especially when chewing a sticky food such as cooked rice, The splint 1 may stick to food and come off the tooth 2. In such a case, the chewing motion cannot be performed smoothly, and the splint 1 may be broken by being bitten in an imperfect maintenance state. There is also.

Further, in the three-layer structure disclosed in the above-mentioned publication, since the soft layer is located on the surface, the chewing movement of food cannot be sufficiently performed, and it functions as a mouth guard that protects teeth from external force. However, it is considered to be unsuitable as a splint for treatment of temporomandibular disorders, etc. for the purpose of correcting occlusal abnormalities.

[0007]

DISCLOSURE OF THE INVENTION As a result of intensive studies to solve the above problems, the present inventor forms a hard layer on the occlusal surface side of a tooth and a soft layer on the cervical side of the tooth for close contact. As a result, it was found that an occlusal splint not only excellent in strength, stability and removability, but also not disturbing the masticatory function can be obtained, and the present invention was completed.

[0008]

SUMMARY OF THE INVENTION According to the present invention, a contour line set at a position of 0.5 to 1.5 mm from a survey line of a tooth to the neck side is used as an edge, and a crown portion of the tooth is closely coated. The present invention relates to an occlusal splint in which a portion located closer to the tip of the tooth than near the survey line is made of hard resin and a portion located closer to the tooth neck than near the survey line is made of a soft elastic material.

[0009]

OPERATION AND EXAMPLES The occlusal splint of the present invention is shown in FIGS.

In FIG. 2, when an occlusal pressure is applied from one tooth 10 to a tooth 5 in which the occlusal splint 4 of the present invention is closely adhered to the crown, an appropriate occlusal contact is made between the tooth 10 and the occlusal surface. The lower jaw position and occlusion are corrected. Since the occlusal surface of the occlusal splint 4 is made of a hard resin, the occlusal splint 4 has hardness enough to chew food between the teeth 10. The part of the side surface of the tooth 5 of the occlusal splint 4 from above the survey line 7 to the outer contour line 6 is made of a soft elastic material, supports the tooth undercut portion, and is elastic to the splint due to its elasticity. Is given.

The soft portion 9 of the splint 4 is in close contact with the undercut portion of the tooth 5 to ensure the maintaining force of the splint 4 against the tooth 5 and the survey line 7
More preferably on the tooth neck side from the outline 6 set at a position of 0.5 to 1.5 mm, particularly preferably 1 mm,
It is formed by filling the mold up to the vicinity of the survey line 7 with a soft resin and clamping the mold. When this outline is set at a position closer than 0.5 mm to the tooth neck side from the survey line, the maintenance force of the splint to be created is reduced, while
If it is set to a position farther than 5 mm, the soft elastic material used is likely to peel or deform. However, it goes without saying that there are individual differences in the morphology of the teeth, and in general, the morphology of the teeth should be considered when examining the maintenance power of the occlusal splint.

The soft elastic material that can be used in the present invention is preferably a polyolefin-based soft elastic material that can be elastically expanded to the outside when the splint 4 is attached and detached so that the tooth 5 can be attached and detached smoothly. In particular, Morteno (registered trademark, which is a polyolefin resin,
A polyolefin-based thermoplastic elastomer manufactured by Morten Co., Ltd.) is preferable in terms of adhesiveness. As the soft elastic material, it is preferable to use one having a hardness (JIS A) of 65 to 90, especially 75. Hardness (JISA)
When the value is larger than 90, the attaching / detaching operation to the tooth becomes difficult, and when the value is smaller than 65, the retaining force tends to decrease. In addition, from the viewpoint of maintaining power, the elastic modulus (Young's modulus) of the soft elastic material is 9 × 10 ^{7 to} 13 × 10 ⁷ d.
yn / cm ² is preferred.

The hard portion 8 forming the occlusal splint 4 of the present invention is located from the vicinity of the survey line 7 to the tip of the tooth, that is, the occlusal surface side, and covers the maximum ridge of the tooth 5 to increase the maintenance force. For this purpose, the soft portion is clamped in the mold and then cured and polymerized to form.

The hard portion 8 is made of a hard resin and is preferably polymethylmethacrylate.

The thickness of the hard portion 8 varies depending on the case to which it is applied and the material used, but it is usually 0.2 to 4 mm.

The Knoop hardness of the hard portion after formation is 10 to 2
It is preferably 0.

For formation, heat polymerization is carried out according to a conventional method. For example, heating is performed at 100 ° C. for 30 to 40 minutes.

The gypsum, wax, separating agent, clay-like material and the like used in forming the occlusal splint of the present invention may be those usually used.

The boundary surface between the soft portion 9 and the hard portion 8 may be inclined upward with respect to the tooth side in order to increase the bonding area, and an adhesive may be applied when the hard portion 8 is heat-polymerized. To be in close contact with. The adhesive is preferably Morprimer T100 (registered trademark, manufactured by Morten Co., Ltd., in which a copolymer of methylmethacrylate and polyolefin is dissolved in an organic solvent) from the viewpoint of compatibility of both materials to be adhered.

Next, the present invention will be explained based on examples, but the present invention is not limited to such examples.

Example 1 FIGS. 3 (a) to 3 (g) show a process of producing an occlusal splint of Example 1.

(A) A splint model 12 was formed by placing wax on a dental gypsum model 11 formed by taking an impression from the oral cavity of a patient. The contour line 6 was set at a position of 1 mm below the survey line 7 of the tooth model 11 (to the neck side), and the finishing line wax 13 was set at the site of the splint model 12 corresponding to the survey line 7.

(B) The tooth model 11 is embedded with the plaster 14 up to the finishing line wax 13, and after hardening it, a separating agent is applied to the surface of the gypsum 14, and the splint model 12 is further plastered with another plaster 15. Coated. After the plaster 15 was hardened, the plasters 14 and 15 were divided and dewaxed.

(C) The recesses 16 and 16 between the tooth model 11 and the plaster 14 were filled with the clay-like material 17 so that the upper end was closer to the tooth tip side than the previously set survey line 7.

(D) Tooth model 11 and clay-like material 17
The gypsum 18 was poured over the surface and cured.

(E) The plasters 14 and 18 are divided, the clay-like material 17 is removed, and then the space is filled with Morteno (registered trademark, manufactured by Morten Co., Ltd., polyolefin-based thermoplastic elastomer) in a softened state by heating. And plaster 14, 18
Was clamped and molded to form the soft portion 9.

(F) The plasters 14 and 18 are divided, and an adhesive agent (Mole Primer T) is applied to the adhesive surface of the soft portion 9 with the hard portion 8.
100 (registered trademark, manufactured by Morten Co., Ltd., a copolymer of methyl methacrylate and polyolefin dissolved in an organic solvent, not shown) was applied, and then a mochi-like PMMA resin was applied to the splint 15 mold surface of the plaster 15. Fill and plaster 1
The mold was clamped according to 4, and the hard portion 8 was formed by polymerizing and hardening in 100 ° C. hot water. The hard portion 8 and the soft portion 9 were adhered during the curing.

(G) The plasters 14 and 15 were destroyed and removed, and the occlusal splint 4 was taken out.

The occlusal splint 4 produced in this manner was used as a chief complaint of spontaneous pain of the temporomandibular joint or masticatory muscles of 8 persons or pain at the time of mastication or opening. It was worn for 2 to 6 months on a patient with temporomandibular disorders in which a decrease in the blood pressure was observed, and the progress was observed. As a result, 8
Detachment during use of the splint was not observed in all the examples, and it was properly maintained even when chewing food,
From the interview, it was found that the feeling of wearing and the sense of security during use were also satisfactory.

In the conventional use example of the splint formed only of hard resin, the splint is detached at the time of eating or talking, and the detached splint is bitten and broken, or when fearing such a situation, the splint is eaten. 1 / example that patient removes
Since about 3 was observed, it is proved that the maintenance power was greatly improved in the splint of the present invention.

Embodiment 2 FIG. 4 shows a modification of the occlusal sprint of the present invention.

As in Example 1, the soft part 9 was prepared by filling with the motheno, and then the partial denture 19 made of the PMMA resin, which was made of the artificial teeth 22 and 22 and the denture base 21, and the PMMA resin. The formed hard portion 8 was integrally formed at the same time to obtain the splint portion 20.

Two patients with temporomandibular disorders of the same cases as in Example 1 who had a defect in their molars were fitted with a splint integrally formed with a partial denture for 2 to 6 months, and the progress was observed. As a result, it was shown that the splint of the present invention has excellent maintainability and satisfactory wearing feeling as in Example 1. In addition, it was shown that the partial denture can be maintained by utilizing the maintenance force of the splint, so that a maintenance mechanism for the partial denture is not necessary, which is a very useful splint.

[0034]

According to the present invention, by maintaining the tooth tip side portion made of hard resin and the tooth neck side portion made of soft elastic material, the retention force of the occlusal splint on the tooth is maintained. Can be improved. Due to this improvement in maintenance power, even when chewing sticky foods such as cooked rice, the splint does not detach from the teeth and the chewing movement can be performed smoothly, and at the same time, a sense of security during use can be obtained.

Further, according to the present invention, it is possible to chew in a state in which the maintenance power is increased by the soft portion, and since the occlusal surface is made of a hard material, an appropriate occlusal can be obtained, which results in abnormal jaw function. And the therapeutic effect of temporomandibular disorders is promoted.

Further, according to the present invention, the edge of the occlusal splint is made of a soft material, so that the resistance to fracture is increased. That is, a splint made of a conventional hard resin often breaks from its edge due to an abnormal occlusal pressure or the like, but in the splint of the present invention, the edge part is made of a soft elastic material. Therefore, there is little risk of breaking from here.

[Brief description of drawings]

FIG. 1 is a perspective view of an occlusal splint of the present invention.

FIG. 2 is a cross-sectional view showing an embodiment of the occlusal splint of the present invention.

FIG. 3 is a cross-sectional view showing a manufacturing process according to the first embodiment of the present invention.

FIG. 4 is a perspective view showing a modified example of the occlusal splint obtained in the second embodiment of the present invention.

FIG. 5 is a sectional view showing an example of a conventional occlusal splint.

[Explanation of symbols]

 1, 4, 20 Occlusal splint 2, 5, 10 Tooth 6 Outline line 7 Survey line 8 Hard part 9 Soft part 11 Dental plaster model 12 Splint model 14, 15, 18 Gypsum 17 Clay-like material 19 Partial denture 22 Artificial tooth

Claims (4)

[Claims] 1. From the survey line of the tooth to the neck side of the tooth.
The outer contour line set at a position of 5 to 1.5 mm is used as an edge to closely coat the crown portion of the tooth, and a portion located closer to the tip side of the tooth than near the survey line is made of hard resin, and near the survey line. The occlusal splint that is made of soft elastic material in the part closer to the cervix. 2. The occlusal splint according to claim 1, wherein the outline is set at a position of 1 mm from the survey line of the tooth toward the tooth neck. 3. The occlusal splint according to claim 1, wherein the hard resin and the soft elastic material are a polymethylmethacrylate resin and a polyolefin soft elastic material, respectively. 4. The occlusal splint according to claim 1, which is integrally formed with a partial denture consisting of an artificial tooth and a denture base.