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Uso do micro-ct num estudo comparativo de limas Protaper Next e Platinum V.EU
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Contexto: A instrumentação mecânica é uma das principais etapas no tratamento endodôntico, tendo por objetivo remover polpa necrótica, bactérias e dentina infetada do canal proporcionando simultaneamente condições ideais para uma boa irrigação e desinfeção. Encontram-se disponíveis centenas de sistemas de limas à disposição no mercado, proporcionando ao clínico uma enorme variedade de escolha.
Objetivo: Avaliar e comparar a capacidade de corte dos sistemas de limas ProTaper Next e Platinum V.EU, em blocos de acrílico, com recurso a micro tomografia computadorizada.
Materiais e Métodos: Foram selecionados 40 blocos de acrílico idênticos, todos com apenas 1 canal. Estes foram divididos aleatoriamente em 2 grupos, cada grupo constituído por 20 blocos. O grupo 1 foi instrumentado com o sistema ProTaper Next e o grupo 2 com o sistema Platinum V.EU. Todos os blocos foram instrumentados pelo mesmo operador, neste caso, o autor da tese de mestrado, aluno do 5º ano de Medicina Dentária.
Cada bloco foi scaneado pré-instrumentação, através de micro tomografia computadorizada, de modo a obter as dimensões de cada canal.
Após instrumentação, todos os blocos foram novamente submetidos a análise de micro-ct. Através da comparação dos valores iniciais e finais obtidos, foram elaboradas várias tabelas, facilitando a análise de resultados. Estas tabelas englobaram a avaliação de 4 parâmetros: Transporte mésio-distal; Volume canalar; Área de superfície canalar e Índice do modelo de estrutura (SMI).
Resultados: Não foram encontradas diferenças estatisticamente significativas entre os dois grupos para as variáveis: Volume, área e transporte mésio-distal. Apenas a variável SMI se mostrou significativamente aumentada (entre as fases I e II) no grupo 1, o que não se verificou no grupo 2.
Conclusão: Os sistemas ProTaper Next e Platinum V.EU possuem uma eficácia comparável, não sendo possível atribuir uma melhor capacidade de corte a nenhum dos grupos avaliados
Contextualization: Mechanical instrumentation is one of the main steps in endodontic treatment, aiming to remove necrotic pulp, bacteria and infected dentin from the canal while providing ideal conditions for good irrigation and disinfection. Hundreds of file systems are available on the market, providing clinicians with a huge amount of options. Objective: To evaluate and compare the shaping ability of ProTaper Next and Platinum V.EU files systems, in acrylic blocks, using micro computed tomography. Materials and Methods: 40 identical acrylic blocks were selected, all containing only 1 canal. These were randomly divided into 2 groups, each group consisting of 20 blocks. Group 1 was instrumented with the ProTaper Next system and group 2 with the Platinum V.EU system. All blocks were instrumented by the same operator, in this case, the author of the master’s thesis, student of the 5th year of Dentistry. Each block was scanned pre-instrumentation through micro computed tomography to obtain the dimensions of each channel. After instrumentation, all blocks were again submitted to micro-ct analysis. By comparing the initial and final values obtained, several tables were elaborated, facilitating the analysis of results. These tables included the evaluation of 4 parameters: mesio-distal transportation; canal volume; canal surface area and structure model index (SMI). Results: No statistically significant differences were found between the two groups for the variables: volume, area and mesio-distal transportation. Only the SMI variable showed a significant increase (during phases I and II) in group 1, which was not verified for group 2. Conclusion: ProTaper Next and Platinum V.EU systems appear to be similarly effective, making it not possible to assign a better cutting efficiency to any of the evaluated groups.
Contextualization: Mechanical instrumentation is one of the main steps in endodontic treatment, aiming to remove necrotic pulp, bacteria and infected dentin from the canal while providing ideal conditions for good irrigation and disinfection. Hundreds of file systems are available on the market, providing clinicians with a huge amount of options. Objective: To evaluate and compare the shaping ability of ProTaper Next and Platinum V.EU files systems, in acrylic blocks, using micro computed tomography. Materials and Methods: 40 identical acrylic blocks were selected, all containing only 1 canal. These were randomly divided into 2 groups, each group consisting of 20 blocks. Group 1 was instrumented with the ProTaper Next system and group 2 with the Platinum V.EU system. All blocks were instrumented by the same operator, in this case, the author of the master’s thesis, student of the 5th year of Dentistry. Each block was scanned pre-instrumentation through micro computed tomography to obtain the dimensions of each channel. After instrumentation, all blocks were again submitted to micro-ct analysis. By comparing the initial and final values obtained, several tables were elaborated, facilitating the analysis of results. These tables included the evaluation of 4 parameters: mesio-distal transportation; canal volume; canal surface area and structure model index (SMI). Results: No statistically significant differences were found between the two groups for the variables: volume, area and mesio-distal transportation. Only the SMI variable showed a significant increase (during phases I and II) in group 1, which was not verified for group 2. Conclusion: ProTaper Next and Platinum V.EU systems appear to be similarly effective, making it not possible to assign a better cutting efficiency to any of the evaluated groups.
Descrição
Dissertação para obtenção do grau de Mestre no Instituto Universitário Egas Moniz
Palavras-chave
Microtomografia computadorizada ProTaper Next Platinum V.EU Níquel-titânio