Revista de Odontologia da UNESP
ISSN 1807-2577 (Eletrônico)
Artigo Original

Evaluation of bond strength of a conventional adhesive system in irradiated teeth

Avaliação da resistência de união de um sistema adesivo convencional em dentes irradiados

Emanuel Jordan de Carvalho, Maria Eduarda Lopes Viégas Camara, Jéssika Raissa Medeiros de Almeida, André Luís Dorini, Marilia Regalado Galvão

Abstract

Introduction: One of the most common treatments of head and neck cancer patients is radiotherapy, a treatment method which uses ionizing radiation beam and destroys tumor cells, minimizing damage to neighbor cells. Purpose: To evaluate the bond strength of a conventional adhesive system in irradiated teeth. Method: 24 third human molars, 12 of which were randomly exposed to radiation and prepared from the removal of occlusal enamel, then exposed to a flat dentine surface. The adhesive system Stae was applied according to the manufacturer’s instructions. Next, two 2 mm increments of resin were implemented. The samples were hemi sectioned specimens, originating shapped toothpick. To evaluate the bond strength, a micro tensile test was done with 500N load and speed of 0.5 mm/minute. Result: There was no statistically significant difference between the bond strength of teeth which were or were not exposed to radiation and which used a conventional adhesive system. Conclusion: Although the radiation doses applied may cause some alterations in microscopic range in dental tissues, it can be concluded that these alterations do not influence in the bond strength in dentin of irradiated teeth.

Keywords

Adhesiveness; radiotherapy; composite resins; radiation.

Resumo

Introdução: Um dos tratamentos mais comuns dos pacientes portadores de câncer na região de cabeça e pescoço é a radioterapia, um método de tratamento que utiliza feixe de radiação ionizante e tem por finalidade destruir as células tumorais, minimizando danos às células vizinhas. Objetivo: Avaliar a resistência de união de um sistema adesivo convencional em dentes irradiados. Método: 24 terceiros molares, dos quais 12 foram aleatoriamente expostos à irradiação e preparados a partir da remoção do esmalte oclusal, expondo, dessa forma, uma superfície de dentina. O sistema adesivo Stae foi aplicado de acordo com as instruções do fabricante e em seguida acrescentou-se dois incrementos de resina de 2 mm. Os corpos de prova foram hemi-seccionados originando espécimes em forma de palito. Para avaliação da resistência de união, foi realizado o ensaio de microtração com carga de 500N e velocidade de 0,5mm/min. Resultado: Não houve diferença estatística significante entre a resistência de união de dentes que foram ou não expostos à irradiação e que utilizaram um sistema adesivo convencional. Conclusão: Embora as doses de radiação aplicadas causem algum tipo de alteração em escala microscópica nos tecidos dentários, essas alterações não interferiram na resistência de união.

Palavras-chave

Adesividade; radioterapia; resinas compostas.

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