Journal article
Radiopacity and mechanical properties of dental adhesives with strontium hydroxyapatite nanofillers
Journal of the mechanical behavior of biomedical materials, Vol.101, pp.103447-103447
01/01/2020
DOI: 10.1016/j.jmbbm.2019.103447
PMID: 31563111
Abstract
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 [Sr-10(PO4)(6)(OH)(2), SrHAp] synthesized by a simple hydrothermal method.
Methods: Strontium phosphates were prepared using co-precipitation (SrHApOh) 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 SrHApOh 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.
Details
- Title: Subtitle
- Radiopacity and mechanical properties of dental adhesives with strontium hydroxyapatite nanofillers
- Creators
- E. V. Carvalho - Universidade Federal do CearáD. M. de Paula - Paulo Picanco Sch Dent, Res Div, BR-60325218 Fortaleza, Ceara, BrazilD. M. Andrade Neto - Fed Univ Ceara UFC, Grp Chem Adv Mat GQMat, Dept Analyt Chem & Phys Chem, Campus Pici,CP 12100, BR-60451970 Fortaleza, Ceara, BrazilL. S. Costa - Universidade Estadual de Campinas (UNICAMP)D. F. Dias - Universidade Federal do CearáV. P. Feitosa - Universidade Federal do CearáP. B. A. Fechine - Universidade Federal do Ceará
- Resource Type
- Journal article
- Publication Details
- Journal of the mechanical behavior of biomedical materials, Vol.101, pp.103447-103447
- Publisher
- Elsevier
- DOI
- 10.1016/j.jmbbm.2019.103447
- PMID
- 31563111
- ISSN
- 1751-6161
- eISSN
- 1878-0180
- Number of pages
- 10
- Grant note
- 408790/2016-4 / CNPq (Brazilian agency); Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPQ) PNE-0112-00048.01.00/16 / FUNCAP (Brazilian agency) 001; 23038.006958/2014-96 / CAPES (Brazilian agency); Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior (CAPES)
- Language
- English
- Date published
- 01/01/2020
- Academic Unit
- Operative Dentistry
- Record Identifier
- 9984654470302771
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