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Radiopacity and mechanical properties of dental adhesives with strontium hydroxyapatite nanofillers.
Carvalho, E V; de Paula, D M; Andrade Neto, D M; Costa, L S; Dias, D F; Feitosa, V P; Fechine, P B A.
Afiliação
  • Carvalho EV; Group of Chemistry of Advanced Materials (GQMat) - Department of Analytical Chemistry and Physical-chemistry, Federal University of Ceará - UFC, Campus do Pici, CP 12100, 60451-970, Fortaleza, Brazil; Technology Center, Christus University Center, Fortaleza, 60160-230, Brazil.
  • de Paula DM; Research Division, Paulo Picanço School of Dentistry, Fortaleza, 60325-218, Brazil.
  • Andrade Neto DM; Group of Chemistry of Advanced Materials (GQMat) - Department of Analytical Chemistry and Physical-chemistry, Federal University of Ceará - UFC, Campus do Pici, CP 12100, 60451-970, Fortaleza, Brazil.
  • Costa LS; Institute of Chemistry, University of Campinas - UNICAMP, Campus Universitário Zeferino Vaz - Barão Geraldo, CP 6154, CEP 13083-970, Campinas, SP, Brazil.
  • Dias DF; Laboratiry X-Ray (LRX) - Department of Physic, Federal University of Ceará - UFC, Campus do Pici, CP 6030, 60451-970, Fortaleza, Brazil.
  • Feitosa VP; Research Division, Paulo Picanço School of Dentistry, Fortaleza, 60325-218, Brazil; Post-Graduate Program in Dentistry - Department of Restorative Dentistry, Federal University of Ceará, Fortaleza, Brazil.
  • Fechine PBA; Group of Chemistry of Advanced Materials (GQMat) - Department of Analytical Chemistry and Physical-chemistry, Federal University of Ceará - UFC, Campus do Pici, CP 12100, 60451-970, Fortaleza, Brazil. Electronic address: fechine@ufc.br.
J Mech Behav Biomed Mater ; 101: 103447, 2020 01.
Article em En | MEDLINE | ID: mdl-31563111
OBJECTIVES: Dental resins filled with hydroxyapatite (HAp) nanoparticles have significantly revolutionized restorative dentistry offering advantages such as remineralization potential and increase of polymerization. However, these materials have limited radiopacity hindering the diagnosis of secondary caries. The present study investigated the development of a new radiopaque dental adhesive by incorporating novel pure strontium hydroxyapatite nanoparticles [Sr10(PO4)6(OH)2, SrHAp] synthesized by a simple hydrothermal method. METHODS: Strontium phosphates were prepared using co-precipitation (SrHAp0h) and hydrothermal treatment for 2 and 5h (SrHAp2h and SrHAp5h). The crystallinity, crystallite size, textural and morphology features of the nanoparticles were characterized by XRD, FT-IR, micro-Raman and TEM. Strontium hydroxyapatite (SrHAp) or calcium hydroxyapatite (HAp) nanoparticles were then incorporated (10 wt%) into an adhesive resin of a commercial three-step etch-and-rinse adhesive to evaluate the radiopacity of disk-shaped specimens, degree of conversion (DC) assessed by FT-IR and mechanical properties by three-point bending test. The unfilled adhesive was used as negative control. RESULTS: While SrHAp0h and SrHAp2h resulted a phase mixing, the pure and highly crystalline phase of strontium hydroxyapatite free of calcium was obtained with 5h hydrothermal treatment (SrHAp5h). The TEM images revealed nanorods morphology for SrHAp5h. SrHAps incorporated into adhesive showed higher radiopacity, no alteration on DC despite slightly reducing the mechanical properties. SIGNIFICANCE: Although the mechanical properties are slightly impaired, incorporation of SrHAp nanoparticles offers potential method to improve radiopacity of restorative dental resins, easing the tracking of actual remineralization effects and enabling diagnosis of recurrent caries.
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Estrôncio / Cimentos Dentários / Nanoestruturas / Fenômenos Mecânicos / Hidroxiapatitas Idioma: En Revista: J Mech Behav Biomed Mater Assunto da revista: ENGENHARIA BIOMEDICA Ano de publicação: 2020 Tipo de documento: Article País de afiliação: Brasil País de publicação: Holanda
Texto completo
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Estrôncio / Cimentos Dentários / Nanoestruturas / Fenômenos Mecânicos / Hidroxiapatitas Idioma: En Revista: J Mech Behav Biomed Mater Assunto da revista: ENGENHARIA BIOMEDICA Ano de publicação: 2020 Tipo de documento: Article País de afiliação: Brasil País de publicação: Holanda