Importance

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Abstract

An orthodontic appliance includes a configuration which makes it difficult for dental plaque to be deposited thereon and which prevents lateral movement of an arch wire as well as precisely preforming a torque shift without an auxiliary attachment wire. The orthodontic appliance is used in dental treatment includes a bracket having an arch wire passage formed therein to extend substantially horizontally and a lock pin insertion passage for insertion of a lock pin therethrough, the lock pin being substantially vertically oriented between the surface of a tooth and the arch wire passage for pressing the arch wire toward a side further from the tooth surface to thereby position the arch wire. The lock pin insertion passage has a bow-shape jetting toward the tooth surface and the lock pin is bow-shaped such that the following mathematical expression is satisfied: R.sub.P .ltoreq.R.sub.L wherein R.sub.P is a radius of curvature of the lock pin insertion passage and R.sub.L is a radius of curvature of the lock pin such that the inner surface of the bow-shape portion of the lock pin presses the arch wire.

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First Claim