fa Can a soda-lime glass be used to demonstrate how patterns of strength dependence are influenced by pre-cementation and resin-cementation variables? ترمیمی Cosmetic and Restorative Dentistry پژوهشي Research <p> <strong>Objectives</strong></p><p>  To determine how the variability in biaxial flexure strength of a soda-lime glass analogue for a PLV and DBC material was influenced by precementation operative variables and following resin-cement coating.</p><p> <strong> Methods</strong></p><p>  The flexural modulus of a transparent soda-lime glass was determined by longitudinally sectioning into rectangular bar-shaped specimens and the flexural moduli of three resin-based materials (Venus Flow, Rely-X Veneer and Clearfil Majesty Posterior) was also determined. Disc shaped soda-lime glass specimens (n=240) were divided into ten groups and were alumina particle air abraded, hydrofluoric (HF) acid-etched and resin-cement coated prior to biaxial flexure strength testing. Sample sets were profilometrically evaluated to determine the surface texture. One-way analyses of variance (ANOVA) and post hoc all paired Tukey tests were performed at a significance level of P<0.05. The mean biaxial flexure strengths were plotted against resin-coating thickness and a regression analysis enabled estimation of the ‘actual’ magnitude of strengthening. </p><p> <strong>Results</strong></p><p>  The mean three-point flexural modulus of the soda-lime glass was 40.0 (1.0)GPa and the Venus Flow, Rely-X Veneer and Clearfil Majesty Posterior were 3.0 (0.2)GPa, 6.0 (0.2)GPa and 14.8 (1.6)GPa, respectively. At a theoretical ‘zero’ resin-coating thickness an increase in biaxial flexure strength of 20.1% (63.2MPa), 30.8% (68.8MPa) and 36.3% (71.7MPa), respectively was evident compared with the control (52.6 (5.5)MPa). </p><p> <strong>Conclusions</strong></p><p>  Disc-shaped specimens cut from round stock facilitated rapid fabrication of discs with uniform surface condition and demonstrated strength dependence was influenced by precementation parameters and resin-cementation variables. </p><hr><p></p><p> <strong>Source: </strong>Journal of Dentistry</p><p> <a href="http://www.jodjournal.com/article/S0300-5712(12)00119-4/abstract" target="_blank"><font color="#0000ff">Full Text</font></a></p> Biaxial flexure strength, Resin-based composite, Soda-lime glass 0 0 http://idai.ir/browse.php?a_code=A-10-32-2093&slc_lang=fa&sid=1 Paul Hooi 10031947532846009802 10031947532846009802 Yes Materials Science Unit, Dublin Dental University Hospital, Lincoln Place, Trinity College Dublin, Ireland Owen Addison 10031947532846009803 10031947532846009803 No Biomaterials Unit, University of Birmingham School of Dentistry, St. Chad's Queensway, Birmingham B4 6NN, UK Gary J.P.Fleming 10031947532846009804 10031947532846009804 No Materials Science Unit, Dublin Dental University Hospital, Lincoln Place, Trinity College Dublin, Ireland