LOCK DEVICE FOR ORTHODONTIC TREATMENT

摘要

A lock device for orthodontic treatment which comprises a holding member fixed to a molar tooth band, and a spring wire having an end which is detachably held by the holding member. The holding member is shaped such that the end of the spring wire is axially moved along the holding member and held by the holding member. Either of the holding member and the spring wire is elastic in a direction perpendicular to its axis. The holding member is provided with a first latch portion which serves to prevent movement of the end of the spring wire in a direction of mounting, and a second latch portion which serves to prevent movement of the end of the spring wire in a direction of detaching. The spring wire is provided with a first lock portion which engages with the first latch portion of the holding member, and a second lock portion which engages with the second latch portion of the holding member. When the end of the spring wire is axially moved along the holding member and held by the holding member, the first lock portion of the spring wire engages with first latch portion of the holding member, and the elasticity of either of the holding member and the spring wire causes the second lock portion of the spring wire to engage with the second latch portion of the holding member, so that the spring wire is locked by the holding member.