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Effect of light-curing units and activation mode on polymerization shrinkage and shrinkage stress of composite resins
Lopes, Lawrence Gonzaga; Franco, Eduardo Batista; Pereira, José Carlos; Mondelli, Rafael Francisco Lia.
  • Lopes, Lawrence Gonzaga; Federal University of Goiás. Dental School. Department of Preventive and Oral Reabilitation. Goiânia. BR
  • Franco, Eduardo Batista; São Paulo State University. Bauru School of Dentistry. Department of Operative Dentistry, Dental Materials and Endodontics. Bauru. BR
  • Pereira, José Carlos; São Paulo State University. Bauru School of Dentistry. Department of Operative Dentistry, Dental Materials and Endodontics. Bauru. BR
  • Mondelli, Rafael Francisco Lia; São Paulo State University. Bauru School of Dentistry. Department of Operative Dentistry, Dental Materials and Endodontics. Bauru. BR
J. appl. oral sci ; 16(1): 35-42, Jan.-Feb. 2008. ilus, graf, tab
Artigo em Inglês | LILACS | ID: lil-472687
ABSTRACT
The aim of this study was to evaluate the polymerization shrinkage and shrinkage stress of composites polymerized with a LED and a quartz tungsten halogen (QTH) light sources. The LED was used in a conventional mode (CM) and the QTH was used in both conventional and pulse-delay modes (PD). The composite resins used were Z100, A110, SureFil and Bisfil 2B (chemical-cured). Composite deformation upon polymerization was measured by the strain gauge method. The shrinkage stress was measured by photoelastic analysis. The polymerization shrinkage data were analyzed statistically using two-way ANOVA and Tukey test (p<0.05), and the stress data were analyzed by one-way ANOVA and Tukey's test (p<0.05). Shrinkage and stress means of Bisfil 2B were statistically significant lower than those of Z100, A110 and SureFil. In general, the PD mode reduced the contraction and the stress values when compared to CM. LED generated the same stress as QTH in conventional mode. Regardless of the activation mode, SureFil produced lower contraction and stress values than the other light-cured resins. Conversely, Z100 and A110 produced the greatest contraction and stress values. As expected, the chemically cured resin generated lower shrinkage and stress than the light-cured resins. In conclusion, The PD mode effectively decreased contraction stress for Z100 and A110. Development of stress in light-cured resins depended on the shrinkage value.
Assuntos

Texto completo: DisponíveL Índice: LILACS (Américas) Assunto principal: Resinas Compostas / Materiais Dentários / Lâmpadas de Polimerização Dentária Tipo de estudo: Estudo prognóstico Limite: Humanos Idioma: Inglês Revista: J. appl. oral sci Assunto da revista: Odontologia Ano de publicação: 2008 Tipo de documento: Artigo País de afiliação: Brasil Instituição/País de afiliação: Federal University of Goiás/BR / São Paulo State University/BR

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Texto completo: DisponíveL Índice: LILACS (Américas) Assunto principal: Resinas Compostas / Materiais Dentários / Lâmpadas de Polimerização Dentária Tipo de estudo: Estudo prognóstico Limite: Humanos Idioma: Inglês Revista: J. appl. oral sci Assunto da revista: Odontologia Ano de publicação: 2008 Tipo de documento: Artigo País de afiliação: Brasil Instituição/País de afiliação: Federal University of Goiás/BR / São Paulo State University/BR