Thermoplasticity capacity of gutta‑percha with different tapers
Capacidade de termoplastificação da guta-percha com diferentes conicidades
Nascimento, Camila Almeida; Tanomaru-Filho, Mário; Bosso, Roberta; Kuga, Milton Carlos; Guerreiro-Tanomaru, Juliane Maria
Rev. odontol. UNESP, vol.39, n6, p.351-354, 2010
Abstract
Objective: The objective of this study was to evaluate the thermoplasticity of the gutta-percha cones used for root canal obturation: Dentsply convencional (Dentsply Ind. e Com., Petrópolis, RJ, Brazil), Dentsply 0.04, (Dentsply Ind. e Com., Petrópolis, RJ, Brazil), Antaeos 0.04 (VDW GmbH, Munich, Germany), ProTaper (Dentsply Ind. e Com., Petrópolis, RJ, Brazil) and Alfa 0.06 (VDW GmbH, Munich, Germany). Material and method: Specimens of each material (n = 10) were prepared after heating. After 24 hours were again heated to 70 °C and placed between two glass plates and subjected to a compression of 5 kg for 2 minutes. The scanned image of the groups before and after the compression was analyzed with the software Image Tool (UTHSCSA Image Tool for Windows version 3.0, San Antonio, TX, USA). The flow capacity of the different materials was determined by the difference between the initial and final area of each specimen. The results were submitted to ANOVA and Tukey test with significance level of 5%. Result: Among the material evaluated, the gutta-percha cones Alpha 0.06 and ProTaper presented more thermoplasticity than other groups (p < 0.05). The Dentsply gutta-percha presented thermoplasticity intermediate. The groups Dentsply 0.04 and 0.04 showed lower thermoplasticity after heating (p > 0.05). Conclusion: The gutta‑percha present different property of thermoplasticity, which is important to selection of thermoplastic obturation techniques.
Keywords
Endodontics, root canal obturation, gutta-percha
Resumo
Objetivo: O objetivo deste estudo foi avaliar a capacidade de termoplastificação da guta-percha com diferentes conicidades utilizadas na obturação de canais radiculares: Dentsply convencional (Dentsply Ind. e Com. Ltda., Petrópolis - RJ, Brasil), Dentsply 0,04, (Dentsply Ind. e Com. Ltda., Petrópolis-RJ, Brasil), Antaeos 0,04 (VDW GmbH, München, Alemanha), Protaper (Dentsply Ind. e Com. Ltda., Petrópolis-RJ, Brasil) e Alfa 0,06 (VDW GmbH, München, Alemanha). Material e método: Corpos de prova de cada material (n = 10) foram confeccionados após aquecimento. Depois de 24 horas, foram novamente aquecidos à temperatura de 70 °C e posicionados entre duas placas de vidro, sendo submetidos a uma compressão de 5 kg por 2 minutos. A imagem digitalizada dos grupos antes e depois da compressão foi analisada no software Image Tool (UTHSCSA Image Tool for Windows version 3.0, San Antonio, TX, USA). A capacidade de escoamento dos diferentes materiais foi determinada pela diferença entre as áreas inicial e final da cada espécime. Os resultados obtidos foram submetidos ao teste ANOVA e Tukey com nível de significância de 5%. Resultado: Dentre os materiais analisados, os cones de guta-percha Alfa 0,06 e Protaper apresentaram maior termoplastificação quando comparados aos demais (p < 0,05). O grupo Dentsply apresentou termoplasticidade intermediária, enquanto que os grupos Dentsply 0,04 e Antaeos 0,04 apresentaram menor termoplastificação após aquecimento (p > 0,05). Conclusão: Os cones de guta-percha apresentam diferentes propriedades de termoplastificação, sendo esta característica importante na seleção das técnicas de obturação termoplásticas.
Palavras-chave
Endodontia, obturação do canal radicular, guta-percha
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