ResumoIntrodução: o diâmetro reduzido do mini-implante, e a decorrente facilidade na sua inserção, minimizam a possibilidade de erro do operador e de contato entre a rosca do mini-implante e a raiz dentária. Entretanto, o risco de fratura da peça aumenta à medida que seu diâmetro é diminuído. Métodos: neste trabalho foram analisados quatro produtos de marcas nacionais (INP, SIN, Conexão e Neodente) e um de marca alemã (Mondeal), com o objetivo de identificar características importantes para o bom desempenho deste recurso como acessório de ancoragem. Foram observados composição e design das peças e realizado o ensaio mecânico de torque até a fratura (estudo in vitro), cujos valores foram submetidos à análise de variância (ANOVA) e teste de Tukey. Resultados: os resultados mostraram que todos os mini-implantes testados estão aptos à utilização clínica como reforço de ancoragem ortodôntica.Palavras-chave: Mini-implante. Ancoragem esquelética.

The simulated computer model used in this investigation suggests that a face-bow with a symmetrically soldered joint and arms of equal lengths used in combination with a transpalatal arch is the best headgear option when asymmetric movement of upper molars is desired.

Introduction: Skeletal Class III malocclusion is a deformity of complex treatment, with few intervention alternatives, which are further limited in nongrowing patients. In most cases, orthognathic surgery is the ideal treatment for adults, an option often refused by patients. Mild to moderate skeletal Class III malocclusions and acceptable facial esthetics can benefit from a course of treatment in which dental movements are used to compensate for the skeletal discrepancy. Objective: This study aimed to discuss orthodontic camouflage as an option for adult patients with Class III malocclusion, emphasizing its indications, implications and expected results.

Objetivo: Descrever e revisar como a cirurgia ortognática pode afetar o sistema estomatognático, evidenciando a importância da fisioterapia pós-operatória durante o período de reabilitação. Revisão bibliográfica: A cirurgia ortognática pode diminuir a amplitude dos movimentos mandibulares, diminuir a força dos músculos da mastigação, piorar a função velofaríngea e causar alterações neurosensoriais de diferentes níveis. Pacientes orientados a realizar fisioterapia após a cirurgia apresentaram melhoras mais significativas e mais rápidas em relação aos pacientes que não receberam essa orientação. Diversos protocolos de exercícios foram propostos, com diferentes momentos de início, períodos de duração e tipos de exercícios realizados. Considerações finais: Os benefícios da cirurgia ortognática são inquestionáveis, porém ela também gera sequelas pós-operatórias, especialmente na musculatura orofacial e nervos sensitivos da região. Embora não haja um consenso na literatura sobre quando começar ou que tipos de exercícios realizar na fisioterapia pós-cirúrgica, a grande maioria afirma que pacientes que a realizam apresentam melhora das funções musculares de forma mais rápida e mais eficiente.

Os autores se responsabilizam publicamente pelo conteúdo desta obra, garantindo que o mesmo é de autoria própria, assumindo integral responsabilidade diante de terceiros, quer de natureza moral ou patrimonial, em razão de seu conteúdo, declarando que o trabalho é original, livre de plágio acadêmico e que não infringe nenhum direito de propriedade intelectual de terceiros. Os autores declaram não haver nenhuma irregularidade que comprometa a integridade desta obra. O conteúdo do artigo não reflete a opinião da editora, do conselho editorial e nem da organizadora do livro.

Objective: To analyze maxillary molar displacement by applying three different angulations to the outer bow of cervical-pull headgear, using the finite element method (FEM). Methods: Maxilla, teeth set up in Class II malocclusion and equipment were modeled through variational formulation and their values represented in X, Y, Z coordinates. Simulations were performed using a PC computer and ANSYS software version 8.1. Each outer bow model reproduced force lines that ran above (ACR) (1), below (BCR) (2) and through the center of resistance (CR) (3) of the maxillary permanent molars of each Class II model. Evaluation was limited to the initial movement of molars submitted to an extraoral force of 4 Newtons. Results: The initial distal movement of the molars, using as reference the mesial surface of the tube, was higher in the crown of the BCR model (0.47x10 -6 ) as well as in the root of the ACR (0.32x10 -6 ) model, causing the crown to tip distally and mesially, respectively. On the CR model, the points on the crown (0.15 x10 -6 ) and root (0.12 x10 -6 ) moved distally in a balanced manner, which resulted in bodily movement. In occlusal view, the crowns on all models showed a tendency towards initial distal rotation, but on the CR model this movement was very small. In the vertical direction (Z), all models displayed extrusive movement (BCR 0.18 x10 -6 ; CR 0.62 x10 -6 ; ACR 0.72x10 -6 ). Conclusions: Computer simulations of cervical-pull headgear use disclosed the presence of extrusive and distal movement, distal crown and root tipping, or bodily movement. Head Professor, Fluminense Federal University. ******** PhD in Orthodontics, Federal University of Rio de Janeiro. Adjunct Professor, Federal University of Rio de Janeiro. A B CDental Press J Orthod 38 2010 Sept-Oct;15(5):37-9Analysis of initial movement of maxillary molars submitted to extraoral forces: a 3D studyOn the model where the resultant passed through the center of resistance (CR), distal bodily movement occurred, causing displacement of the distal root as far as the middle third. On the model where the resultant of forces passed above the center of resistance (ACR), displacement was greater in the distal root, producing a forward tip.In occlusal view, all models showed a trend towards initial distal rotation of the crown. In the CR model however this movement was very limited. Results for vertical direction (Uz) revealed that all models exhibited extrusion, which was higher on the ACR model. The extrusion noted in the three models can be explained by the origin of the force application point, which is low, i.e., in the patients' neck Care should be exercised in cases where it is necessary to raise the outer bow in order to achieve an external line of action as close as possible to the effect desired for the molar, since outer bow elevation increases the extrusive component.It was shown that the use of cervical headgear causes extrusive and distal movement. Force line orientation is important to control the type of maxillary molar movement, which can ...

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This case report intends to provide the facial characteristics of Escobar syndrome and to describe the orthodontic treatment of a 12-year-old female patient diagnosed with it. Escobar syndrome, a variant of the multiple pterygium syndrome, is a rare disorder with many systemic, facial, and oral manifestations.The patient presented with mixed dentition, severe dolichofacial pattern, increased lower facial height, convex profile, severe anterior open bite, maxillary hypoplasia, and mandibular retrognatism. The multidisciplinary approach included soft cleft palate repair, orthodontic treatment, orthognathic surgery, restorative cosmetic dentistry, speech therapy, and physiotherapy. Despite the limitations imposed by the syndrome, this report illustrates how the multidisciplinary treatment approach aided in the correction of occlusal function and facial esthetics and improvement in the quality of life of the patient with Escobar syndrome.