Alterações, imediatas e a longo prazo, do tratamento da maloclusão de Classe II 1ª Divisão de Angle.

OBJETIVOS:O objetivo desse estudo foi avaliar as alterações dimensionais, imediatas e a longo prazo, nas arcadas dentárias de pacientes Classe II 1ª Divisão de Angle,  tratados ortodonticamente. MÉTODOS: Para avaliação das distâncias transversas, profundidade das arcadas, índice de irregularidade, sobremordida, sobressaliência e relações anteroposteriores foram utilizados modelos de gesso digitalizados de 14 pacientes. Foram realizadas medidas lineares no período pré-tratamento (T1), após o uso do aparelho extrabucal(T2), após a conclusão do tratamento com aparelho fixo (T3) e na proservação a longo prazo (T4). RESULTADOS: Houve um aumento, estatisticamente significante, nas distâncias transversas e profundidade da arcada superior, redução da sobressaliência e correção da relação de molares e caninos (p0.05) entre T1 e T2. Entre T3 e T4 houve uma redução, estatisticamente significante, das medidas transversas (com exceção dos molares), na profundidade das arcadas e aumento no índice de irregularidade (p0.05). CONCLUSÃO: Observou-se que a longo prazo ocorreu uma redução nas medidas transversas e ausência de alterações significativas na relação anteroposterior. Esta constatação revela a estabilidade da correção da Classe II.

Effect of orthodontic treatment on tooth autotransplantation : systematic review of controlled clinical trials

This systematic review was focused on evaluating tooth autotransplantation, considering its impacts on the teeth, bone, soft tissues, and aesthetics in orthodontic patients. A bibliographic search was conducted without limitations on year of publication or language in the databases of PubMed, Web of Science, Scopus, Medline Complete, Cochrane, Clinical Trials, and Trials Central. For triage of articles, indications, surgical planning, orthodontic movement, risk factors for treatment, and long-term follow-ups were considered. For outcomes, the results with reference to teeth, alveolar bone, periodontal tissues, and esthetic satisfaction were considered. Risk of bias was evaluated using the methodological index for nonrandomized studies-MINORS. The results showed 10 controlled clinical trials, and no randomized clinical trials were found. The selected studies included 715 patients and 934 autotransplanted teeth among which there were premolars, molars, and anterior teeth evaluated in the long term, indicating that orthodontics associated with autotransplantation indicated a result that was generally clinically acceptable. The quality of the set of evidence was considered medium due to the presence of different methodological problems, risk of bias, and significant heterogeneity in the evaluated studies. There was a sufficient body of evidence that justified autotransplantation in patients who needed orthodontic movement. In teeth, there was an increase in root resorption influenced by orthodontics, but without impacting on the general clinical result in the long term. Bone and periodontal tissue do not appear to be affected by orthodontics. The patient’s aesthetic satisfaction was not considered in the studies

Shear bond strength of metallic brackets photo-activated with light-emitting diode (LED) at different exposure times

The purpose of this study was to compare the shear bond strength of orthodontic metallic brackets photo-activated with two different light-curing sources at different exposure times: halogen light (XL 1500, 3M ESPE) and LED light (Ortholux, 3M Unitek). Sixty bovine permanent lower incisors were inserted into PVC tubes containing plaster. The buccal surfaces were cleaned with pumice and water, and then etched with 37% phosphoric acid gel. The XT Primer bonding agent (3M Unitek) was applied to the enamel surfaces and the metallic pre-coated brackets (Transbond APC II system, 3M Unitek) were attached to upper central incisors. The teeth were randomly divided into four groups (n=15). In Group I (Control), halogen light was used for 40 seconds, while in Groups II, III, and IV were light-cured with LED light unit for 40, 10, and 5 seconds, respectively. The teeth were stored in distilled water at 37°C for 24 hours. The brackets were submitted to shear bond strength test in universal testing machine (Instron) at a crosshead speed of 0.5 mm/minute. Shear bond strength means (MPa) were 4.87 for Group I; 5.89 for Group II; 4.83 for Group III, and 4.39 for Group IV. Tukey's test detected no statistically significant differences among the groups regarding the shear bond strength (p>0.05). Neither of the types of light-curing sources or exposure times influenced the shear bond strength of metallic brackets