Dentistry – Apparatus – Having means to record or indicate jaw movement or position...
Reexamination Certificate
2000-05-22
2001-06-12
Mancene, Gene (Department: 3732)
Dentistry
Apparatus
Having means to record or indicate jaw movement or position...
C433S048000, C433S214000
Reexamination Certificate
active
06244864
ABSTRACT:
TECHNICAL FIELD
The present invention relates to a teeth mark impression recording member. The teeth mark impression recording member is used for dental operations, such as dental prosthesis of the crown, bridging, and the like, which use a dental CAD/CAM equipment. The teeth mark impression recording member is used to record shapes and tracks of opposing teeth during chewing (which may be called “an occlusal record” or “a teeth mark impression”.).
BACKGROUND ART
Up to now, a single-layer teeth mark impression recording member, which uses polyethylene wax and the like, having plasticity, is known. The teeth mark impression recording member is used to record shapes and tracks of opposing teeth by inserting the member into an oral cavity and by chewing the teeth mark impression recording member back and forth, right and left and the like.
However, the teeth mark impression recording member of the prior art which is made from polyethylene wax has the following problems.
(1) In case of the recording tracks of teeth which move in al directions dynamically, such as in chewing situation, the teeth mark impression recording member tends to move to the different position which are predetermined and to float from the teeth. As a result, the teeth mark impression of the opposing teeth may have an error.
Accordingly, the hardened teeth mark impression recording member has been made. In accordance with the attempt, however, it becomes difficult to fix and stick the member into teeth, and thereby it is not easy to obtain a teeth mark impression of the opposing teeth accurately.
(2) After recording a teeth mark impression, when the teeth mark impression recording member is taken out from the oral cavity, the record in the impression recording part may be easily deformed. In accordance with the previous teeth mark impression recording member, therefore, the member must be treated so carefully and it is difficult to maintain the teeth mark impression for a certain period of time.
(3) Further, when three dimensional data is taken from the teeth mark impression, which is recorded by the previous teeth mark impression recording member, owing to insufficiencies of hardness and rigidity, it is difficult to measure the shape of the teeth mark impression by using a contact measuring system.
Accordingly, using an ideal diffusion-type laser light system has beem proposed. In accordance with the proposal, however, in irradiating the laser light onto the teeth mark impression recording member consisting of a polyethylene wax, the laser light transmits, spreads or internally reflects in one direction only, and thereby it is difficult to measure the teeth mark impression accurately.
Under the circumstances, the present invention, i.e. such a teeth mark impression recording member and a method for using the same has an excellent reflective property with an ideal diffusion-type laser light system by constituting the teeth mark impression recording member which comprises a fixing part for fixing and sticking the member into abutment teeth, and a impression recording part for recording an impression of opposing teeth, wherein at least the impression recording part includes a reflection modifier as an additive.
DISCLOSURE OF THE INVENTION
(1) The present invention provides a teeth mark impression recording member comprising a fixing part for fixing and sticking the member into teeth and an impression recording part for recording an impression of opposing teeth,
wherein at least the impression recording part includes a reflection modifier.
By constituting a teeth mark impression recording member like this, the above-mentioned problems can be solved. In accordance with the present invention, therefore, when a laser light is irradiated onto the impression recording part of the teeth mark impression recording member, due to the reflection modifier, the part may reflect the uniformly diffused laser light. Therefore, by detecting the uniformly diffused laser light, three-dimensional teeth mark impression, which was recorded in the teeth mark impression recording member, may be measured accurately.
Further, the fixing part of the teeth mark impression recording member in accordance with the present invention is fixed and stuck into abutment teeth etc., and the impression recording part is bonded to the fixing part. Therefore, if opposing teeth moves sideways or in front and back directions, due to the rigidity of the fixing part, movement of the impression recording part is restricted effectively. As a result, due to the impression recording part, it is easy to obtain a teeth mark impression of the opposing teeth having an excellent accuracy.
(2) In accordance with the teeth mark impression recording member of the present invention, as the reflection modifier, it is preferable to use at least one compound selected from the group consisting of titanium oxide, silicon oxide, aluminum oxide, zirconium oxide, indium oxide, tin oxide, zinc oxide, antimony oxide, yttrium oxide, cobalt oxide, barium sulfate, sodium sulfate, calcium carbonate, sodium carbonate, carbon, a carbon black, a glass fiber and a carbon fiber.
By using the reflection modifier, relatively small addition of the modifier may exhibit an excellent reflection modifying effect. In other word, by using the reflection modifier, since the irradiated laser light is uniformly diffused and then reflected, the transmittance, the spreading and the internal reflection in only one direction of the laser light are effectively inhibited.
(3) In accordance with the teeth mark impression recording member of the present invention, the reflection modifier is preferably included in the range of 0.01 to 80 weight % of the whole amount.
Since the reflection modifier is included in the above range, a predetermined reflection modifying effect may be obtained with maintaining an excellent impression recording ability of the impression recording part.
(4) In accordance with the teeth mark impression recording member of the present invention, the glass transition temperature of the fixing part is preferably higher than the glass transition temperature of the impression recording part. In other word, where the glass transition temperature of the fixing part is Tg
1
, and the glass transition temperature of the impression recording part is Tg
2
, it is preferable that the relationship “Tg
1
>Tg
2
” is met.
Since the relationship of the glass transition temperatures is met, better balance of the impression recording ability and the fixing and sticking abilities can be obtained.
The glass transition temperature of the resin may be measured, for example by using a DSC method, at the heating speed of 10° C./min under the nitrogen stream atmosphere, as a changing point of specific heat.
(5) In accordance with the teeth mark impression recording member of the present invention, the Shore A hardness (according to JIS K6301) of the resin used for the fixing part is preferably higher than the Shore A hardness of the resin used for the impression recording part. In other word, where the Shore A hardness of the resin used for the fixing part is SA
1
, and the Shore A hardness of the resin used for the impression recording part is SA
2
, it is preferable that the relationship “SA
1
>SA
2
” is met.
Since the relationship of the Shore A hardnesses is met, better balance of the impression recording ability and the fixing and sticking abilities may be obtained.
The Shore A hardness of the resin may be measured according to JIS K6301 standard.
(6) In accordance with the teeth mark impression recording member of the present invention, the melting point of the resin used for the fixing part is preferably higher than the melting point of the resin used for the impression recording part. In other word, where the melting point of the resin used for the fixing part is Mp
1
, and the melting point of the resin used for the fixing impression recording part is Mp
2
, it is preferable that the relationship “Mp
1
>Mp
2
” is met.
Since the relationship of the melting point is met, better balance of the
Fujiwara Toshihisa
Tsuji Hironobu
Bumgarner Melba
Kanesaka & Takeuchi
Mancene Gene
Nissan Digital Process Ltd.
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