Effect of photoactivation methods and base materials on the stress generated by the polymerization shrinkage of a resin composite

Authors

  • Leonardo Gonçalves Cunha Department of Restorative Dentistry – Piracicaba Dental School
  • Roberta Caroline Bruschi Alonso Department of Restorative Dentistry – Piracicaba Dental School
  • Mario Alexandre Coelho Sinhoreti Department of Restorative Dentistry – Piracicaba Dental School
  • Mario Fernando Goes Department of Restorative Dentistry – Piracicaba Dental School
  • Lourenço Correr Sobrinho Department of Restorative Dentistry – Piracicaba Dental School

DOI:

https://doi.org/10.20396/bjos.v3i11.8641776

Keywords:

Base materials. Photoactivation methods. Resin composite. Shrinkage stress

Abstract

The aim of this study was to evaluate the effect of different photoactivation methods and base materials on the stress generated by the polymerization shrinkage of composites. The evaluated groups for the base material were: (G1) 1 coat of adhesive; (G2) 3 coats of adhesive, and (G3) flowable composite as a liner. The groups were divided in agreement with the photoactivation method: Continuous light (CL); Stepped Light (SL); Intermittent Light (IL); LED and Xenon Plasma Arc (XP). The generated stress was measured in a universal testing machine 5 minutes after the end of the photoactivation. The results were submitted to ANOVA and the averages values compared by Tukey test (5%). Inside of G1 group the mean values varied between 1.62 MPa (XP) to 2.22 MPa (CL), in which the XP method presented statistically inferior values to the other appraised methods. The values inside of G2 and G3 varied from 1.64 MPa (LED) to 2.15 MPa (CL) and 1.24 MPa (IL) to 1.92 MPa (SL), respectively, and the methods LED and IL presented statistically inferior values comparatively to the method CL inside of G2 and CL and SL inside of G3. The use of base materials was shown efficient in the reduction of the stress level generated by the polymerization shrinkage of restorative composites when LED or Intermittent light photoactivation methods are used.

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Author Biographies

Leonardo Gonçalves Cunha, Department of Restorative Dentistry – Piracicaba Dental School

Graduate at Odontologia from Universidade Estadual de Campinas (2000), master's at Odontology from Universidade Estadual de Campinas (2003) and ph.d. at Odontology from Universidade Estadual de Campinas (2007). Has experience in Odontology, focusing on Odontology, acting on the following subjects: fotoativação, compósito, compósito odontológico, dureza knoop and photoactivation method.

Roberta Caroline Bruschi Alonso, Department of Restorative Dentistry – Piracicaba Dental School

Has graduation at Odontologia by Universidade Estadual de Campinas (2000) , master's at Materiais Dentários by Universidade Estadual de Campinas (2003) , Ph.D. at Materiais Dentários by Universidade Estadual de Campinas (2007) and Postdoctorate by Universidade Estadual de Campinas (2009) . Currently is Revisor de periódico of Journal of Clinical Rehabilitative Tissue Engineering Research (CRTER)., Revisor de periódico of Oral Health and Preventive Dentistry, Revisor de periódico of Indian Journal of Dental Research, Celetista formal of Universidade Bandeirante de São Paulo, Revisor de periódico of Perspectives in Oral Sciences, Revisor de periódico of Dental Materials, Revisor de periódico of The Journal of Adhesive Dentistry, Revisor de periódico of Revista de Pesquisa e Inovação Farmacêutica, Revisor de periódico of Photomedicine and Laser Surgery, Membro de corpo editorial of Revista de Pesquisa e Inovação Farmacêutica, Membro de comitê assessor of (FAPESP) Fundação de Amparo à Pesquisa do Estado de São Paulo, Revisor de periódico of Brazilian Oral Research (Impresso), Revisor de projeto de fomento of Fundação de Amparo à Pesquisa do Estado de São Paulo e Membro de comitê assessor of Universidade Bandeirante Anhanguera. Has experience in the area of Odontology. Focused, mainly, in the subjects: Fotoativação, Compósitos odontológicos, Adaptação Marginal, Resistência de união.

Mario Alexandre Coelho Sinhoreti, Department of Restorative Dentistry – Piracicaba Dental School

has graduation at Odontologia by Universidade Estadual de Campinas (1991) , master's at Materiais Dentários by Universidade Estadual de Campinas (1995) and Ph.D. at Materiais Dentários by Universidade Estadual de Campinas (1997) . Currently is Servidor público ou celetista of Universidade Estadual de Campinas, Membro de corpo editorial of Brazilian Journal of Oral Sciences (1677-3217), Revisor de periódico of Journal of Applied Polymer Science (0021-8995), Revisor de periódico of Journal of Applied Oral Science (1678-7757), Revisor de periódico of Materials Research (1516-1439), Revisor de periódico of Brazilian Dental Journal (0103-6440), Revisor de periódico of Brazilian Journal of Oral Sciences (1677-3217), Revisor de periódico of RPG. Revista de Pós-Graduação (USP) (0104-5695), Revisor de periódico of Pesquisa Odontológica Brasileira (1517-7491), Revisor de periódico of Ciência Odontológica Brasileira (1678-2046), Revisor de periódico of Revista de Odontologia da UNESP (0101-1774), Revisor de periódico of Revista da Faculdade de Odontologia. Universidade de Passo Fundo, Revisor de periódico of Oral Sciences e Membro de corpo editorial of Oral Sciences. Has experience in the area of Odontology , with emphasis on Materiais Odontológicos. Focused, mainly, in the subjects: método de fotoativação, compósitos, resistência da união, contração de polimerização.

Mario Fernando Goes, Department of Restorative Dentistry – Piracicaba Dental School

graduate at Odontology from Universidade Estadual de Campinas (1978), master's at Odontology from Universidade Estadual de Campinas (1981) and ph.d. at Odontological Materials from Universidade de São Paulo (1990). Has experience in Odontology, focusing on Odontological Materials, acting on the following subjects: sistemas adesivos, resina composta, porcelana, materiais restauradores and composite resin.

Lourenço Correr Sobrinho, Department of Restorative Dentistry – Piracicaba Dental School

Possui graduação em Odontologia pela Universidade Estadual de Campinas (1988), mestrado em Materiais Dentários pela Universidade Estadual de Campinas (1991) e doutorado em Odontologia (Reabilitação Oral) pela Universidade de São Paulo (1995). Atualmente é professor titular da Universidade Estadual de Campinas (UNICAMP).

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Published

2015-11-17

How to Cite

1.
Cunha LG, Alonso RCB, Sinhoreti MAC, Goes MF, Correr Sobrinho L. Effect of photoactivation methods and base materials on the stress generated by the polymerization shrinkage of a resin composite. Braz. J. Oral Sci. [Internet]. 2015 Nov. 17 [cited 2022 Aug. 18];3(11):609-14. Available from: https://periodicos.sbu.unicamp.br/ojs/index.php/bjos/article/view/8641776

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