RESUMO
In conventional Class II treatment, distalisation of the maxillary arch usually requires multiple phases of tooth movement during which anchorage loss can occur. In order to solve this issue, a rational and simple technique has been developed. Instead of using intraoral distalisers along with palatal mini-implants, Ni-Ti superelastic loops are used to obtain molar distalisation while buccal interradicular miniscrews (BIM), preferably placed between the roots of upper premolars, supply the necessary anchorage. Once the distalisation of molars and second premolars is performed, miniscrews are placed between the roots of first molars and second premolars after removing the previous miniscrews. Elastic chains or tie-backs, which go from the new miniscrews to the hooks of a 0.019×0.025-inch stainless-steel archwire, produce the retraction of incisors, canines and first premolars with optimal control of anchorage. Clinical cases are shown to illustrate the technique.
Assuntos
Má Oclusão Classe II de Angle , Procedimentos de Ancoragem Ortodôntica , Parafusos Ósseos , Cefalometria , Humanos , Má Oclusão Classe II de Angle/terapia , Maxila , Dente Molar , Desenho de Aparelho Ortodôntico , Técnicas de Movimentação Dentária/métodosRESUMO
An original straightwire appliance was developed in order to easily adapt force and friction to the different stages and needs of treatment. The appliance features: (1) conventional brackets with a 0.020×0.030â³ slot in the anterior area, passive self-ligating brackets with a 0.022×0.030â³ slot in the lateral area, and tubes with a 0.022×0.030â³ slot in the molar area; (2) archwires which adapt to the different stages of treatment and increase their section and stiffness progressively, starting with 0.014â³ superelastic NiTi, passing through 0.016×0.025â³ and 0.019×0.025â³ heat-activated NiTi and reaching 0.019×0.025â³ stainless steel working archwires; (3) use of several ligation systems which progressively increase their binding (low-friction ligatures, "O"- or "8"-shape elastomeric ligatures). Clinical cases are shown to illustrate the technique.
Assuntos
Má Oclusão/terapia , Braquetes Ortodônticos , Fios Ortodônticos , Adolescente , Feminino , Humanos , Desenho de Aparelho OrtodônticoAssuntos
Má Oclusão Classe II de Angle/terapia , Fios Ortodônticos , Ortodontia Corretiva/instrumentação , Ortodontia Corretiva/métodos , Técnicas de Movimentação Dentária/métodos , Adolescente , Cefalometria , Criança , Elastômeros , Feminino , Humanos , Masculino , Dente Molar , Procedimentos de Ancoragem Ortodôntica/instrumentaçãoRESUMO
When closed eruption is used to recover palatally impacted canines, patients risk a second surgical operation because the traction attachment could come off or the wire ligature, which is connected to the attachment, could break. In order to reduce this risk, a new simple technique has been developed. Instead of the classic single one, two attachments are bonded to the impacted canine. During the orthodontic finishing, the technique includes a mandibular premolar bracket bonded to the ectopic canine. This device should produce a more negative torque (Torque -17 degrees rather than -7 degrees) over the root, which usually remains in palatal position soon after the performed crown recovery.
