| 摘要 |
<p>A system of orthodontic appliances and method for their use for gaining space in a dental arch without extraction. Space is gained in the maxillary arch (10) primarily through a transpalatal bar (20), transmitting force to selected teeth throuh (9) a maxillary lingual sheath (28), the receiving portion of the sheath having a mesial offset of about eight degrees. Additional space in the maxillary arch may be gained by employing an extraoral force appliance, transmitting force through a maxilliary buccal tube (38) carried on a selected pair of maxillary molars. The mandibular arch is treated by applying similar forces to selected molars through a lip bumper (50). This appliance transmits force through a mandibular buccal tube (52) that receives the bumper in a passage having a mesial offset of about five degrees. The mandibular buccal tube also carries an archwire receiving passage, distally offset by about four degrees.</p> |
