Orthodontic applicance with radiused wire slot
A set of orthodontic brackets is provided in combination with an archwire extending over an arc when fitted to the set of orthodontic brackets. The archwire has at least one radius of curvature over the length of its arc, and each one of said brackets in the set has an archwire slot. Each slot has at least one surface supporting the archwire which is contoured to have a radius of curvature that matches the radius of curvature along the arc of the archwire at that point. A round archwire is preferred and the archwire slots may be formed as tubular channels to provide better torque action for the archwire.
1. A combination, comprising
a set of orthodontic brackets and an archwire, each said bracket having an archwire slot with a base surface that is in contact with and supports said archwire, said archwire adapted to bear against said base surfaces and thereby apply pressure to a patient's teeth to correct malocclusions,
the archwire extending lengthwise in a mesial-distal direction, and forming an outer surface having at least one first radius of curvature along said mesial-distal direction, and a second radius of curvature along a direction substantially perpendicular to said mesial distal direction;
said base surfaces of said archwire slots having at least one third radius of curvature along said mesial distal direction, said at least one third radius of curvature substantially congruent with said at least one first radius of curvature, such that said base surfaces of said archwire slots are in contact with said archwire over a curved, contiguous mesial-distal length of said archwire when said set of orthodontic brackets and said archwire are assembled together, and
said base surfaces of said archwire slots having a fourth radius of curvature along a direction perpendicular to said mesial distal direction, said fourth radius of curvature substantially congruent with the second radius of curvature such that said base surfaces of said archwire slots are in contact with said archwire over a curved, contiguous arc in a plane perpendicular to said mesial distal direction, when said set of orthodontic brackets and said archwire are assembled together.
2. The combination of claim 1 wherein each said bracket is configured to selectively, snapably receive and retain said archwire in said archwire slot.
3. The combination of claim 2 wherein each archwire slot comprises a hook portion and a nose portion.
4. The combination of claim 3 wherein each of the hook portion and the nose portion are elastically deformable to snapably receive and retain the archwire.
5. The combination of claim 4 wherein the hook portion and the nose portion are configured such that, when the archwire is inserted into the slot, the hook portion and the nose portion elastically deform in opposite directions relative to each other.