Halogen light versus LED for bracket bonding: shear bond strength.

INTRODUCTION: LED light-curing devices seek to provide a cold light activator which allows protocols of material polymerization with shorter duration. OBJECTIVE: The present study aimed to evaluate the shear bond strength of bracket bonding using three types of light-curing devices: One with halogen light (Optilight Plus - Gnatus) and two with LEDs (Optilight CL - Gnatus and Elipar Freelight - 3M/ESPE). RESULTS: Comparing the results by analysis of variance, the Gnatus LED device showed an inferior statistical behavior in relation to other light sources, when activated by a short time. But, when it was used for 40 seconds, the polymerization results were consistent with the other evaluated sources. The device with the best average performance was the halogen light, followed by the 3M/ESPE LED. CONCLUSION: It was concluded that the LEDs may be indicated in orthodontic practice, as long as a protocol is used for the application of light with the activation time of 40 seconds.

Halogen light versus LED for bracket bonding: shear bond strength

INTRODUCTION: LED light-curing devices seek to provide a cold light activator which allows protocols of material polymerization with shorter duration. OBJECTIVE: The present study aimed to evaluate the shear bond strength of bracket bonding using three types of light-curing devices: One with halogen light (Optilight Plus - Gnatus) and two with LEDs (Optilight CL - Gnatus and Elipar Freelight - 3M/ESPE). RESULTS: Comparing the results by analysis of variance, the Gnatus LED device showed an inferior statistical behavior in relation to other light sources, when activated by a short time. But, when it was used for 40 seconds, the polymerization results were consistent with the other evaluated sources. The device with the best average performance was the halogen light, followed by the 3M/ESPE LED. CONCLUSION: It was concluded that the LEDs may be indicated in orthodontic practice, as long as a protocol is used for the application of light with the activation time of 40 seconds.

INTRODUÇÃO: os aparelhos de fotopolimerização por LED buscam proporcionar uma luz ativadora fria, que possibilite protocolos de polimerização do material com menor tempo de duração. OBJETIVO: avaliar a resistência à tração da colagem de braquetes, utilizando três tipos de aparelhos fotoativadores: um de luz halógena (Optilight Plus - Gnatus) e outros dois de LED (Optilight CL - Gnatus; e Elipar Freelight - 3M/Espe). RESULTADOS: comparando os resultados por meio da análise de variância, o aparelho de LED Gnatus apresentou comportamento estatístico inferior em relação às outras fontes de luz, quando ativado por tempo reduzido. Já quando foi utilizado o tempo de 40 segundos, os resultados de polimerização foram compatíveis com as demais fontes avaliadas. O aparelho que apresentou melhor desempenho médio foi o de luz halógena, seguido pelo LED 3M/Espe. CONCLUSÃO: concluiu-se que os LEDs podem ser indicados na prática ortodôntica, uma vez que seja utilizado um protocolo de aplicação da luz com tempo de ativação de 40 segundos.

Desgaste interproximal: relato de caso / Interproximal stripping: case report

Alguns pacientes encontram-se na categoria de casos limítrofes no que diz respeito à discrepância entre bases ósseas e o tamanho dentário, podendo ser tratados com ou sem extrações dentárias. Nesses casos, a redução de esmalte interproximal pode apresentar-se como uma boa alternativa de tratamento. Essa terapia pode ser aplicada para a resolução de discrepâncias negativas suaves a moderada do arco dentário e quando não se deseja alterar o perfil facial. O objetivo deste trabalho é realizar uma revisão da literatura sobre os desgastes interproximais do esmalte como uma alternativa de tratamento ortodôntico para pacientes considerados limítrofes e exemplificar a técnica a partir de um caso clínico. Aspectos como a respeito da técnica, indicações e contraindicações serão discutidos. Foi possível concluir que esta é uma abordagem de tratamento válida, desde que aspectos fundamentais sejam considerados.

Some borderline patients can be treated both with and without dental extractions. In such cases, the reduction of interproximal enamel can present itself as a good alternative treatment. This therapy can be applied to solve mild to moderate negative discrepancies of the dental arch and when no facial profile change is expected. The aim of this paper was to review the literature about enamel interproximal reduction as an alternative of orthodontic treatment for borderline patients and illustrate the technique with a clinical case. Aspects such as technique, indications and contraindications were discussed. It was concluded that this is a valid treatment approach, since fundamental aspects have been considered.

Sliding Jig: uma alternativa para correção da Classe II dentária / Sliding jig: an alternative appliance for dental class II correction

Para o tratamento da má oclusão de Classe II dentária pode-se utilizar diversos dispositivos, intra ou extrabucais, que exigem maior ou menor colaboração do paciente. O presente artigo tem como objetivo realizar uma breve revisão de literatura ilustrada por um caso clínico com má oclusão de Classe II de Angle, tratado de forma simples, com baixo custo e muito bem aceito pelo paciente. A mecânica aplicada utilizou um cursor deslizante, também conhecido como sliding jig, associado a elásticos. Este versátil dispositivo pode ser utilizado em várias fases do tratamento, tanto em uma distalização de molares superiores, quanto na manutenção de ancoragem, além de outras possibilidades. No entanto, é fundamental que aspectos básicos que regem sua utilização sejam conhecidos e considerados para o sucesso dos tratamentos.

In order to treat dental Class II malocclusion several devices can be used, either intra or extra-oral, demanding higher or lower patient collaboration. The present study aim at presenting brief literature review illustrate by a clinical case of Angle Class II malocclusion, treated with a simple and low cost approach with good patient compliance. The applied mechanics used a sliding cursor, named sliding jig, associated to elastic therapy. This versatile appliance can be used in several treatment phases, either in upper molar distal movement or anchorage maintenance, among other possibilities. However, is mandatory that basic aspects are observed and acknowledged in order to obtain a successful treatment.

Comparative in vitro study of the shear bond strength of brackets bonded with restorative and orthodontic resins.

The aim of this study was to evaluate the shear bond strength of brackets bonded with different restorative systems and compare it with that afforded by an established orthodontic bonding system. Seventy human bicuspids were used, divided into five different groups with 14 teeth each. Whereas a specific orthodontic bonding resin (Transbond™ XT) was used in the control group, the restorative systems Charisma, Tetric Ceram, TPH Spectrum and Z100 were used in the other four groups. Seven days after bonding the brackets to the samples, shear forces were applied under pressure in a universal testing machine. The data collected was evaluated using the ANOVA test and, when a difference was identified, the Tukey test was applied. A 5% level of significance was adopted. The mean results of the shear bond strength tests were as follows: Group 1 (Charisma), 14.98 MPa; Group 2 (Tetric Ceram), 15.16 MPa; Group 3 (TPH), 17.70 MPa; Group 4 (Z100), 13.91 MPa; and Group 5 or control group (Transbond™ XT), 17.15 MPa. No statistically significant difference was found among the groups. It was concluded that all tested resins have sufficient bond strength to be recommended for bonding orthodontic brackets.

Comparative in vitro study of the shear bond strength of brackets bonded with restorative and orthodontic resins

The aim of this study was to evaluate the shear bond strength of brackets bonded with different restorative systems and compare it with that afforded by an established orthodontic bonding system. Seventy human bicuspids were used, divided into five different groups with 14 teeth each. Whereas a specific orthodontic bonding resin (TransbondTM XT) was used in the control group, the restorative systems Charisma, Tetric Ceram, TPH Spectrum and Z100 were used in the other four groups. Seven days after bonding the brackets to the samples, shear forces were applied under pressure in a universal testing machine. The data collected was evaluated using the ANOVA test and, when a difference was identified, the Tukey test was applied. A 5 percent level of significance was adopted. The mean results of the shear bond strength tests were as follows: Group 1 (Charisma), 14.98 MPa; Group 2 (Tetric Ceram), 15.16 MPa; Group 3 (TPH), 17.70 MPa; Group 4 (Z100), 13.91 MPa; and Group 5 or control group (TransbondTM XT), 17.15 MPa. No statistically significant difference was found among the groups. It was concluded that all tested resins have sufficient bond strength to be recommended for bonding orthodontic brackets.