Dentistry – Orthodontics – Bracket
Patent
1992-07-16
1994-04-05
Mancene, Gene
Dentistry
Orthodontics
Bracket
433 10, A61C 300
Patent
active
052999343
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
1. Technical Field
The present invention concerns a bracket used for correcting set of teeth.
2. Background Art
Heretofore, the bracket of this type, as shown in FIG. 14, comprises a base plate 14 and two wire supports 15, 15 disposed along both ends of the base plate 14, in which square sectioned wire passage grooves 16, 16 are formed in the center of the wire supports 15, 15, respectively.
For correcting irregular set of teeth (state of set of teeth in an irregular arrangement), for instance, by using the bracket C, the following method is usually adopted. That is, as shown in FIG. 16, after the first premolar 17 is extracted, the bracket C is bonded and fixed to the surface of each of teeth at first (refer to FIG. 15). Then, a round wire 6 of a circular cross section is extended under tension along the wire passage grooves 16, 16 of the individual bracket C (refer to FIGS. 14, 15), to correct the arrangement of the teeth along the backward and forward directions, as well as improve the twisting of the teeth and, while on the other hand, the gap after extracting the tooth is closed by moving a canine 19 toward a first molar by the resiliency of a rubber band (not illustrated).
In this case, the canine 19 is moved by the sliding movement, on the round wire 6 of the wire passage grooves 16, 16 of the bracket C bonded and fixed to the canine 10. However, in a case of using the bracket C, since the wire passage grooves 16, 16 are in a line-to-line contact with the round wire 6, a frictional force between them is large and, as a result, it takes a considerably long period of time for the correction.
In view of the above, with an aim of shortening the correction period, the present applicant has previously filed "Teeth Straightening Bracket" in Japanese Patent Application Hei 1-18345. The invention of the above-mentioned application provides, as shown in FIG. 11, a teeth straightening bracket comprising a base plate 11, two wire supports 12, 12 disposed along both ends of the base plate 11 and wire passage grooves 13, 13 formed respectively to the wire supports 12, 12, in which both side walls 13a, 13b of each of the wire passage grooves 13 are formed each in a semi-cylindrical shape and protruding to each other, as well as the bottom surface 13c of the passage groove 13 is formed as a semi-cylindrical convex shape extending from one side wall 13a to the other side wall 13b. In the bracket B of such a constitution, the wire passage grooves 13, 13 are in point-to-point contact with the round wire 6 and, as a result, since the frictional force can be reduced as compared with the line-to-line contact in the conventional bracket C, the period required for the correction can be shortened.
By the way, when the round wire 6 is extended under tension along with the wire passage grooves 13, 13 of the individual brackets B, it is necessary that the round wire 6 is not detached out of the wire passage grooves 13, 13. For this purpose, a hooked engaging finger 21 is disposed at both upper ends of the wire support 12 (FIG. 11), and a binding wire 8 is wound around the bracket B (also in the bracket C) so as to press it against the round wire 6, and the binding wire 8 is prevented from slipping off by the engaging finger 21 (refer to FIGS. 12, 13).
However, if the binding wire 8 is wound around the bracket B so as to press it against the round wire 6, the binding wire 8 presses the round wire 6 downward in FIG. 3. Therefore, when the canine 19 is moved toward the first molar 20 by the sliding movement of the wire passage groove 13 of the bracket B bonded and fixed to the canine 19 along the round wire 6 (refer to FIG. 16), the wire passage holes 13, 13 can not be smoothly moved under sliding along the round wire 6. As a result, an aimed object of shortening the period for the correction by reducing the frictional force exerting between the wire passage holes 13, 13 and the round wire 6 is hindered and can not be attained.
DISCLOSURE OF INVENTION
The present invention has an aim for dissolving the foregoing p
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Cherichetti Cindy A.
Mancene Gene
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