PURPOSE: To observe the three-dimensional change of lower arch when @entity26988 round and square rocking chair archwire was used to open overbite in @entity1 of Angle Class I or Class II with deep overbite,in order to providing experimental basis for clinicians. METHODS: Forty @entity1 were chosen according to the inclusion standard. The @entity1 were divided into four groups according to different archwire and with or without use of lace back and cinch back. The @entity1 were taken plaster model before and after the overbite opened by using typical swinging chair labial arch, Laser scan and imageware software were used to make digital model and measure the three dimensional changes of the lower teeth,All data were analyzed with SPSS 12.0 software package. RESULTS: When Rocking chair archwire was used to open overbite, it made the teeth changed in three dimensions, but the arch shape changed unconspicuously. The width between molars increased while the width between the @entity235 and premolars had little change. The arch length had a tendency to increase and the incisors were intruded and had the tendency of labioclination, the incisor labioclination was more significant with lace back and cinch back. The @entity235 showed the tendency of apical clination and there were obvious changes with the lace back and cinch back,the intruding-extruding change was not obvious. The second premolars were elevated, and the mesio-buccal cusp of the first molar did not move while the apo-buccal cusp was intruded.The first molars have the tendency of distal movement and lingual movement when using @entity26988 square wire. CONCLUSIONS: In the process of opening overbite using rocking chair labial arch, there are different three-dimensional changes of the mandibular arch with @entity26988 round or square archwire, with or without lace back and cinch back.

[Three dimensional changes of lower teeth with XXXX round or square rocking chair archwire].

@entity1 :: ('9606', 'Species') :: ['patients'] @entity26988 :: ('MESH:C040654', 'Chemical') :: ['NiTi'] @entity235 :: ('9615', 'Species') :: ['canines']
@entity26988 :: (MESH:C040654,Chemical) :: ['NiTi']
