Dentistry – Apparatus – Work support
Reexamination Certificate
1999-03-31
2001-04-03
Lucchesi, Nicholas D. (Department: 3732)
Dentistry
Apparatus
Work support
Reexamination Certificate
active
06210160
ABSTRACT:
BACKGROUND OF THE INVENTION
This invention relates to a working cast which can be easily attached to and detached from an articulator, a cover for a working cast which also serves as a mold, and an articulator to which the working cast can be mounted.
To manufacture a crown restoration, a working cast is manufactured first. Then a master model and an antagonist model are mounted on an articulator to adjust the occlusion between the master model and the antagonist model.
As shown schematically in
FIG. 20
, such an articulator comprises a base
1
having a column
1
a
, and a support arm
3
pivotally mounted to the top of the column
1
a
by a pin
2
. To mount a working cast, as shown in
FIG. 21
, plaster paste S
1
is heaped on the base
1
, and plaster paste S
2
is also heaped on the top of a master model M
1
whose bite with respect to an antagonist model M
2
has been fixed by wax beforehand, and further a small amount of plaster paste S
3
is optionally applied to the bottom of the support arm
3
. Then, the models M
1
and M
2
are placed together on the paste S
1
, the support arm
3
is pivoted onto the master model M
1
, and positions of the models M
1
, M
2
are adjusted in this state. Any excess plaster paste protruding from the outer periphery is removed by fingers or a knife.
It is thus extremely troublesome to mount a working cast on an articulator. It is also very time-consuming and low in efficiency to remove the model after the plaster has hardened. It is also necessary to remove plaster stuck on the bottom of the model.
An environment where crown restorations are manufactured is usually scattered with dust including plaster powder, metallic and ceramic powder and wax chips and thus extremely messy. Such dust tends to adhere to the models, thus necessitating cleaning of the models.
An object of this invention is to simplify the attaching and detaching of a working cast to and from an articulator, thereby markedly improving work efficiency.
Another object of this invention is to keep working casts as dust-free as possible.
SUMMARY OF THE INVENTION
According to this invention, there is provided a cover for a working cast which also serves as a mold, the cover comprising an outer surface protective member having a substantially semioval bottom wall, an end wall and a peripheral wall, a gripper having a pair of gripper plates and having an open end, and an engaging means for engagement with an articulator, the gripper being detachably mounted in the outer surface protective member such that the open end faces toward a tip of the outer surface protective member.
The engaging means may be a magnetic member. Also, the outer surface protective member should be formed with a through hole so that the gripper can be pushed out of the protective member by pushing through the hole. The gripper should have a partitioning plate extending to the tip of the outer surface protective member to form a cover for a one-side jaw model.
A positioning means should preferebly be provided on the bottom wall of the outer surface protective member for positioning of the cover on the articulator.
For an antagonist model, a base member having an engaging means and a positioning means is provided. The master model with the cover and the antagonist model with the base member are mounted on the articulator which has retaining plates for retaining the cover and the base member. The retaining plates each have a magnetic member which attracts a magnetic member of the cover and the base member. The retaining plates also have positioning means for positioning the cover and the base member with respect to the articulator.
Other features and objects of the present invention will become apparent from the following description made with reference to the accompanying drawings, in which:
REFERENCES:
patent: 5076786 (1991-12-01), Callne
patent: 5622497 (1997-04-01), Cho
patent: 5730593 (1998-03-01), Mack
patent: 5749725 (1998-05-01), Chinlund
Lucchesi Nicholas D.
Shiken Corporation
Wenderoth, Lind & Ponack, L. L. P.
LandOfFree
Cover for working cast and articulator does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Cover for working cast and articulator, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Cover for working cast and articulator will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2501485