Microdureza de resina composta fotopolimerizável: a cor da matriz experimental pode alterar os resultados dos testes?

Turbino, Miriam Lacalle; Santos, Luciana Aily; Matson, Edmir

doi:10.1590/s1517-74912000000300008

Cited by 3 publications

(1 citation statement)

References 8 publications

(12 reference statements)

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“…A metal device (Houston Biomaterials Research Center, Dental Branch, Houston, University of Texas, USA) was used to fix each sample and a black propylene matrix 25 (University of São Paulo, SP, Brazil, 3 mm high and internal millimetric delimitation) was used to insert the material according to the groups studied.…”

Section: Methodsmentioning

confidence: 99%

Dentine bond strength of a composite resin polymerized with conventional light and argon laser

2004

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ABSTRACT:The use of argon laser (488 nm) has been suggested as a new alternative for polymerizing adhesive materials. This study aimed to evaluate the tensile bond strength of a microfilled composite (A110, 3M) inserted by incremental technique (3 increments of 1 mm) and by single increment (3 mm) polymerized by argon laser for 10, 20 and 30 seconds and halogen light for 40 seconds. Eighty (8 groups of 10 teeth) freshly extracted bovine teeth were stored in a freezer in distilled water for one week. The crowns were cross-sectioned from the roots. Pulpectomy was performed and the pulp chambers were sealed with wax. The buccal surfaces of the teeth were ground with wet sandpaper (grains: 120, 400, and 600) to expose the surface dentin, and the teeth were then included in acrylic resin. A metal device was used to fix each sample and a black propylene matrix 25 (3 mm high with an internal millimetric delimitation) was used to insert the material according to the groups studied. The polymerization intervals were of 10, 20 and 30 seconds for the laser polymerization and 40 seconds for the conventional polymerization. Tensile tests were performed by a Universal Testing Machine 4442 (Instron) at a speed of 0.5 mm/min and 500 N load. According to the methodology used, the incremental technique increased bond strength values. There was no difference between the studied polymerization techniques when resin was filled in 3 increments. DESCRIPTORS: Lasers; argon; Composite resins; Dentin; Tooth. RESUMO:O uso do laser de argônio (488 nm) tem sido sugerido como uma nova alternativa para polimerização de materiais adesivos. Este estudo tem o objetivo de avaliar a resistência adesiva de uma resina composta microparticulada (A110, 3M) inserida pela técnica incremental (3 incrementos de 1 mm) e de incremento único (3 mm) polimerizada com laser de argônio por 10, 20 e 30 segundos e com luz halógena por 40 segundos. Oitenta (8 grupos com 10 dentes) dentes bovinos recém-extraídos foram armazenados em geladeira, em água destilada, por uma semana. As coroas foram separadas das raízes. Foi realizada a pulpectomia, e as coroas foram seladas com cera. As faces vestibulares foram desgastadas com seqüência de lixas (120, 400 e 600) para expor a dentina superficial, e os dentes foram incluídos em resina acrílica. Foi utilizada uma mesa metálica para fixar cada espécime com a matriz de polipropileno preta (3 mm de altura com delimitação interna milimetrada) e inserir a resina de acordo com os grupos estudados. Os tempos de polimerização foram de 10, 20 e 30 segundos para a polimerização com laser e de 40 segundos para a polimerização convencional. Os testes de resistência adesiva foram realizados com a máquina universal de ensaios 4442 (Instron) com velocidade de 0,5 mm/min e carga de 500 N. De acordo com a metodologia usada, a técnica incremental aumentou os valores de resistência adesiva. Não houve diferença entre as técnicas de polimerização usadas quando a resina foi inserida em 3 incrementos.

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Section: Methodsmentioning

confidence: 99%

Dentine bond strength of a composite resin polymerized with conventional light and argon laser

2004

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Microhardness of a dental restorative composite resin containing nanoparticles polymerized with argon ion laser

Delfino¹,

Youssef²,

Souza³

et al. 2012

Optik

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Microdureza de resinas em função da cor e luz halógena

Martins

Delbem

Santos

et al. 2002

Pesqui. Odontol. Bras.

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The aim of this study was to evaluate the influence of light intensity and the influence of the color of a composite resin on Knoop hardness. Samples were confected utilizing polyester matrices with 6 mm of diameter and 2 mm of depth. The matrices were filled with composite resin (Fill Magic - Vigodent), colors A3, B3, C3, D3 and I, and light-cured by means of an Elipar light-curing unit in three different light intensities: 450 mW/cm2, 800 mW/cm2 and an increasing intensity setup of 100 mW/cm2 to 800 mW/cm2. Ninety test specimens were confected, with the standard curing time of 40 seconds. The specimens were stored at 37 +/- 1 degrees C and immersed in distillate water. The Knoop test was carried out in superficial and deep areas of the specimens. The results revealed that there was no statistical difference (Tukey) between the tested colors. However, there was statistical difference between different light intensities. The authors concluded that the color of the composite resin did not influence Knoop hardness and that the progressive intensity setup led to the best Knoop hardness.

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Microdureza de resina composta fotopolimerizável: a cor da matriz experimental pode alterar os resultados dos testes?

Abstract: TURBINO, M. L.; SANTOS, L. A.; MATSON, E. Microdureza de resina composta fotopolimerizável: a cor da matriz experimental pode alterar os resultados dos testes? Pesqui Odontol Bras, v. 14, n. 3, p. 232-236, jul./set. 2000.

Cited by 3 publications

References 8 publications

Dentine bond strength of a composite resin polymerized with conventional light and argon laser

Dentine bond strength of a composite resin polymerized with conventional light and argon laser

Microhardness of a dental restorative composite resin containing nanoparticles polymerized with argon ion laser

Microdureza de resinas em função da cor e luz halógena

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