Dentistry – Orthodontics – Bracket
Patent
1994-07-12
1996-12-24
Lucchesi, Nicholas D.
Dentistry
Orthodontics
Bracket
433 14, A61C 300
Patent
active
055868827
ABSTRACT:
Self-ligating orthodontic brackets comprise a spring ligating member of U-shape with converging arms movable on the bracket body between slot open and closed positions; in the latter position the spring retains an arch wire in the slot and urges the bracket and wire to their optimum relative positions. The ligating member is of a superelastic shape recovery metal alloy, preferably of thickness from 0.20 mm (0.008 in) to 0.25 mm (0.010 in), with rounded edges. At least the lingual portion of the member to be stiffer than the remainder; at least a part of the occlusal portion can also be stiffer. Alternatively, or in addition, the bracket body has a large mesial distal extending bore between and spaced from the bracket occlusal, lingual and labial surfaces and the arch wire slot occlusal surface. The large bore accepts attachment members used for attachment of a range of auxiliaries, such as hooks and traction springs. Alternatively, or in addition, the arch wire slot gingival wall comprises an additional spring; this can be of shape memory alloy and preset to become effective when heated above its transformation temperature. Alternatively, or in addition the arch wire slot has the lingual and gingival surfaces meeting at an angle from 120 to 150 degrees to provide a larger slot; the slot gingival surface may also be provided by an additional spring member.
REFERENCES:
patent: 3772787 (1973-11-01), Hanson
patent: 4248588 (1981-02-01), Hanson
patent: 4492573 (1985-01-01), Hanson
patent: 4698017 (1987-10-01), Hanson
patent: 5190546 (1993-03-01), Jervis
patent: 5380197 (1995-01-01), Hanson
patent: 5474445 (1995-12-01), Voudouris
American Journal of Orthodontics and Dentofacial Orthopedics vol. 90, No. 1, Jul. 1986.
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