fa The addition of nanostructured hydroxyapatite to an experimental adhesive resin ترمیمی Cosmetic and Restorative Dentistry پژوهشي Research <p> <strong>Objectives </strong></p><p> Was produced nanostructured hydroxyapatite (HAnano) and evaluated the influence of its incorporation in an adhesive resin. </p><p> <strong>Methods</strong></p><p>  HAnano was produced by a flame-based process and was characterized by scanning electron microscopy. The surface area, particle size, micro-Raman and cytotoxicity were evaluated. The organic phase was formulated by mixing 50wt.% Bis-GMA, 25wt.% TEGDMA, and 25wt.% HEMA. HAnano was added at seven different concentrations: 0 0.5 1 2 5 10 and 20wt.%. Adhesive resins with hydroxyapatite incorporation were evaluated for their radiopacity, degree of conversion, flexural strength, softening in solvent and microshear bond strength. The data were analyzed by one-way ANOVA and Tukey's post hoc test (α=0.05), except for softening in solvent (paired t-test) and cytotoxicity (two-way ANOVA and Bonferroni). </p><p> <strong>Results</strong></p><p>  HAnano presented 15.096m2/g of specific surface area and a mean size of 26.7nm. The radiopacity values were not different from those of 1-mm aluminium. The degree of conversion ranged from 52.2 to 63.8%. The incorporation of HAnano did not influence the flexural strength, which ranged from 123.3 to 143.4MPa. The percentage of reduction of the microhardness after immersion in the solvent became lower as the HAnano concentration increased. The addition of 2% nanostructured hydroxyapatite resulted in a higher value of microshear bond strength than the control group (p<0.05). </p><p> <strong>Conclusions</strong></p><p>  The incorporation of 2% of nanostructured hydroxyapatite into an adhesive resin presented the best results. </p><p> <strong>Clinical significance</strong></p><p>  The incorporation of nanostructured hydroxyapatite increases the adhesive properties and may be a promising filler for adhesive resin. </p><hr><p></p><p> <strong>Source: </strong>Journal of Dentistry</p><p><a href="http://www.jodjournal.com/article/S0300-5712(13)00002-X/abstract" target="_blank"><font color="#0000ff"> Full Text</font></a></p> Dentine-bonding agents, Hydroxyapatite, Nanostructures 0 0 http://idai.ir/browse.php?a_code=A-10-32-2135&slc_lang=fa&sid=1 Vicente Castelo Branco Leitune 100319475328460010014 100319475328460010014 Yes Dental Materials Laboratory, School of Dentistry, Federal University of Rio Grande do Sul, Porto Alegre, RS, Brazil Fabrício Mezzomo Collares 100319475328460010015 100319475328460010015 No Dental Materials Laboratory, School of Dentistry, Federal University of Rio Grande do Sul, Porto Alegre, RS, Brazil Rafael Mello Trommer 100319475328460010016 100319475328460010016 No Laboratory of Ceramic Materials, Federal University of Rio Grande do Sul, Porto Alegre, RS, Brazil Daniela Guerra Andrioli 100319475328460010017 100319475328460010017 No Dental Materials Laboratory, School of Dentistry, Federal University of Rio Grande do Sul, Porto Alegre, RS, Brazil Carlos Pérez Bergmann 100319475328460010018 100319475328460010018 No Laboratory of Ceramic Materials, Federal University of Rio Grande do Sul, Porto Alegre, RS, Brazil Susana Maria Werner Samuel 100319475328460010019 100319475328460010019 No Dental Materials Laboratory, School of Dentistry, Federal University of Rio Grande do Sul, Porto Alegre, RS, Brazil