Dentistry – Prosthodontics – Stress breaker
Reexamination Certificate
1999-11-16
2002-08-13
Lewis, Ralph A. (Department: 3732)
Dentistry
Prosthodontics
Stress breaker
Reexamination Certificate
active
06431865
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to artificial teeth, particularly, artificial teeth being capable of providing occlusal equilibration and pressure buffering function.
2. Discussion of the Background
Artificial teeth such as a full denture or a partial denture so far have generally comprised hard raw materials, say, resin teeth, hard resin teeth, porcelain teeth, metal teeth, or Levin bladed teeth for the purpose of masticating food, the teeth which are embedded in alveolar the denture base for the purpose of masticating food transmit naturally the resulted biting or masticating pressure directly to the dental plate.
Therefore, if one point of the artificial teeth embedded in the alveolar portion of the dental base is only slightly higher than the other parts, the other parts of the artificial teeth embedded in the alveolar portion of the dental base as well as the client's natural teeth can not meet properly nor occlude well because the other major parts are recessed, thereby resulting in the occlusal disproportion because of said higher one point; thus the mucous membrane under the dental base is likely hurt.
An occlusal proportion caused by only one point makes not only the occlusal disproportion but also imbalance throughout the oral cavity.
As some time has elapsed after the artificial denture was fitted up in the mouth, the occlusal disproportion is resulted from the recession or attrition of the occlusal surface, and addition of resin to the resin teeth, replacement of the artificial tooth or teeth, or at last replacement with a new artificial denture must be employed for the treatment. This means that an economic loss, by taking some adjustment time for the client to adapt to the new artificial denture, and thus inviting undesirable burdens of not only the client but also the dentist.
Furthermore, the artificial denture already fitted up must be still used or ground by means of dental machinery when it is needed to provide an appropriate cusp angle suitable to the individual client.
Until now clients can not help having their dentist provide the occlusal equilibration, and it is so difficult for a client to tell the doctor his or her delicate mismatched feeling of occlusion that it takes a lot of time for both of them to get finally a good, stable occlusion.
An example of this kind of artificial denture is as described in Japanese Laid Open Patent Publication No. 7-67890/1995 and the like.
The artificial teeth specified in said Japanese Laid Open Patent Publication NO. 7-67890/1995, as shown in
FIG. 1
of the Specification of said Publication, the artificial anterior teeth
11
,
12
, and
13
in the maxillary site having each a triangular plate at the lingual surface and the artificial anterior teeth
1
,
2
, and
3
in the mandibular site bite off the eaten food at said triangular flat surface. Artificial teeth
4
a
,
4
b
, and
4
c
in place of the lower first premolar, second premolar and the first molar, respectively, are forming a linked molar band en bloc, and all the molar surfaces are flat. The corresponding artificial tooth
14
in the maxillary site is made as en bloc, a special setting is provided on the molar surface of said artificial tooth
14
, thereby the food is ground.
The artificial tooth
5
in place of the mandibular second molar does not touch with the surface of the corresponding artificial tooth
15
when the mouth is closed as in the natural state. When a propensity force towards in one direction is imposed on one front side of the full denture A, said artificial tooth
15
and the corresponding artificial tooth
5
make occlusion, whereby the stability of the full denture A is realized. Such the artificial teeth have been already developed.
The weakness of the full denture and partial denture heretofore specified is as follows; when only one point is slightly higher than the other points, the conditions at the whole parts are inappropriate because the whole parts of the artificial denture are formed with hard, solid materials, and the artificial teeth are embedded solidly in the alveolar portion of the denture base.
As for a full denture formed en bloc, if one point of said full denture is only slightly higher, it affects the whole denture, resulting in instability of the whole artificial denture, thus likely leading to the upset of the whole denture or giving pains to the mucous membrane.
Hence, if only one higher part exists, no treatment for the very narrow point can be done, it gives problems not only to the full denture but also to the whole oral cavity, and prevents the artificial teeth from providing good occlusion.
If no good occlusion is obtained because the occlusal surface is too much recessed at the time of fitting up of a newly prepared artificial denture, or worn out when some time elapsed after the fitting up of the newly prepared artificial denture, a certain amount of resin is added to the artificial teeth for the compensation, or even it must be replaced with a new artificial denture. It is very difficult to keep the best state of occlusion because it is impossible to adjust the occlusal surface portion with a fine tuning for delicate occlusal adjustment corresponding to very slight changes of occlusion and to keep good occlusal equilibration.
When adjusting the cusp angle is individually necessary because of the differences among individual persons, the states of the counterpart teeth, missing teeth, and/or jaws, grinding by means of the dental machinery or addition of the resin or even replacement with newly prepared teeth becomes necessary.
Furthermore, occlusal adjustment of the artificial denture already fitted up can not be performed by the clients themselves, nor can the clients help having their dentist do so.
The artificial teeth specified in the Japanese Laid Open Patent Publication No. 7-67890/1995 should be applied for the full denture, but not for the partial denture at the time said full denture is prepared, and the maxillary and mandibular teeth must be made at the same time. The teeth at one side of the jaw, however, will not function properly, and let alone, only one tooth can not work properly in such the treatment. The artificial teeth have not characteristic properties of the natural teeth, so that they invite problems for most women who love esthetic looking at all times. And occlusal adjustment can not be done by the clients themselves, nor can they help having their doctor do so.
SUMMARY OF THE INVENTION
The first object of this invention is to prevent the artificial teeth of the partial denture and full denture from their premature contacts.
The second object of this invention is to prevent any premature contacts of the artificial teeth, and to provide artificial teeth capable of relieving biting and masticating pressure.
The third object of this invention is to prevent the premature contacts, and to provide artificial teeth capable of relieving biting and masticating pressure, and in addition being capable of adjusting freely the position of the occlusal surface, thus resulting in stability of the occlusion.
The fourth object of this invention is to provide artificial teeth whose occlusal cusp angle being easily adjusted for the very client who requires said artificial teeth or denture.
The fifth object of this invention is to provide artificial teeth being easily adjusted as they should be, and also to provide good occlusion without grinding off the occlusal surface of the artificial teeth or adding any resin to said teeth.
The sixth object of this invention is to provide proper occlusion of the artificial teeth being adjusted easily not only by the doctor but also by any client himself or herself.
To achieve the above and other objects, the present invention includes a structure so designed that pressure-buffering layer, which is provided between the occlusal surface portion that received biting pressure and/or masticating pressure and the bonded part that connected to the alveolar portion of the denture base, is made of flexible material capable
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