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Stability of initiation systems in acidic photopolymerizable dental material.
Meereis, Carine T W; Leal, Fernanda B; Ogliari, Fabrício A.
Afiliação
  • Meereis CT; Biomaterials Development and Control Center, School of Dentistry, Federal University of Pelotas, Pelotas, RS, Brazil.
  • Leal FB; Biomaterials Development and Control Center, School of Dentistry, Federal University of Pelotas, Pelotas, RS, Brazil.
  • Ogliari FA; Biomaterials Development and Control Center, School of Dentistry, Federal University of Pelotas, Pelotas, RS, Brazil; School of Materials Engineering, Federal University of Pelotas, Pelotas, RS, Brazil. Electronic address: ogliari@gmail.com.
Dent Mater ; 32(7): 889-98, 2016 07.
Article em En | MEDLINE | ID: mdl-27063461
OBJECTIVES: This study simulated the shelf life to evaluate the stability of initiation systems on acidic photopolymerizable dental material, through an experimental self-adhering flowable composite resin (SACR). METHODS: An SACR model was formulated with monomers Bis-GMA, TEGDMA, acidic monomer (GDMA-P), and inorganic fillers. Initiation system combinations of camphorquinone (CQ), tertiary amine (EDAB), diphenyl phosphine oxide (TPO), phenylbis phosphine oxide (BAPO), and the diphenyliodonium hexafluorophosphate (DPIHFP) were tested. Five SACRs were evaluated, varying the initiation system: SACRCQ, SACRCQ+EDAB, SACRCQ+EDAB+DPIHFP, SACRBAPO and SACRTPO. The SARC were stored at 23°C and, according to shelf life, were evaluated for degree of conversion (DC), polymerization rate (Rp) and microtensile bond strength (µTBS). The DC was evaluated after 0, 1, 2, 4, 8, 12, 24 and 48 storage weeks of SACRs. Bonding to dentin was performed after 0, 4, 8, 12 and 24 storage weeks of SACRs and tested immediately (24h) and after 6 and 12 months by µTBS. Halogen light curing unit (3M ESPE) was used for photoactivation procedures. RESULTS: SACRCQ+EDAB+DPIHFP showed higher Rp. The DC of SACRCQ+EDAB, SACRCQ+EDAB+DPIHFP, and SACRBAPO were similar (40%) and higher than SACRTPO and SACRCQ (20 and 10%, respectively), staying stable up to 48 weeks. The SACRCQ, SACRCQ+EDAB, and SACRTPO had pre-testing failure on µTBS. The shelf life of SACRs did not affect the µTBS of the groups that obtained adhesion. Furthermore, the immediate µTBS (MPa) SACRCQ+EDAB+DPIHFP (8.4) was similar to SACRBAPO (10.5); however, after 12 months, only SACRCQ+EDAB+DPIHFP maintained the µTBS. SIGNIFICANCE: The choice of a suitable initiation system is crucial to the performance and stability of acidic photopolymerizable dental material.
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Materiais Dentários / Lâmpadas de Polimerização Dentária Limite: Humans Idioma: En Revista: Dent Mater Assunto da revista: ODONTOLOGIA Ano de publicação: 2016 Tipo de documento: Article País de afiliação: Brasil País de publicação: Reino Unido
Texto completo
Adicionar na Minha BVS
Imprimir
XML
PubMed Links
Buscar no Google

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Materiais Dentários / Lâmpadas de Polimerização Dentária Limite: Humans Idioma: En Revista: Dent Mater Assunto da revista: ODONTOLOGIA Ano de publicação: 2016 Tipo de documento: Article País de afiliação: Brasil País de publicação: Reino Unido