RESUMO
OBJECTIVE: To compare the anchorage potential of mini-implants with modified Nance palatal buttons during simultaneous first and second maxillary molar distalization. METHODS: Mini-implants (1.4 x 10 mm) placed to obtain indirect anchorage for maxillary molar distalization using a superelastic Ni-Ti open coil spring were compared with anchorage derived from a modified Nance palatal button incorporated in a distal jet appliance. Appliances were placed bilaterally in 19 adolescent patients. Lateral cephalograms with guide wires to differentiate the right from left sides were used for evaluation. All measurements (angular and linear) were obtained from these guide wires. RESULTS: Anchorage loss at the first premolar was 13% with mini-implant-supported Ni-Ti coil spring appliances and 24.75% with the Nance palatal button (distal jet appliance) on the right side. On the left side, anchorage loss was 15.4% with mini-implant-supported Ni-Ti coil spring appliances and 23.9% with the Nance palatal button (distal jet appliance). CONCLUSION: Mini-implants do not provide absolute anchorage when used indirectly. However, anchorage conservation is more efficient than modified Nance palatal buttons.
Assuntos
Desenho de Aparelho Ortodôntico , Técnicas de Movimentação Dentária , Dente Pré-Molar , Humanos , Má Oclusão Classe II de Angle , Dente Molar , Técnicas de Movimentação Dentária/instrumentaçãoRESUMO
This article describes a two stage mini-implant approach to distalize the maxillary molars and then retract the anterior teeth into class I, providing a non-compliant, non-extraction treatment.
Assuntos
Implantes Dentários , Dente Molar/patologia , Procedimentos de Ancoragem Ortodôntica/instrumentação , Técnicas de Movimentação Dentária/instrumentação , Adolescente , Ligas , Cefalometria , Dente Canino/patologia , Ligas Dentárias/química , Feminino , Humanos , Incisivo/patologia , Má Oclusão/terapia , Maxila , Níquel/química , Fios Ortodônticos , Planejamento de Assistência ao Paciente , Titânio/químicaRESUMO
This report presents a case of a patient who developed a supernumerary mandibular premolar during the course of orthodontic treatment. Evidence of this tooth comes from consecutive panoramic radiographs. It is not routine practice to screen for developing supernumerary teeth during orthodontic treatment. Therefore, the possibility of supernumerary tooth interference with occlusal development or orthodontic treatment should always be kept in mind. A brief review of literature concerning the late formation of supernumerary teeth is included.
