fa The Effect of two Shading Techniques on Value of Zirconia-Based Crowns پروتزهای دندانی Prothtodontics پژوهشي Research <b> Statement of the Problem:</b> By introducing the coloring liquids, it is claimed that it is possible to make the color of frameworks fabricated from zirconium oxide extremely close to the natural tooth color. <div>  <b>Purpose:</b> The purpose of this research was to evaluate the effect of two staining techniques on value changing in zirconia crowns.</div><div><b> Materials and Method: </b>Three groups A, B, and C, each containing ten zirconia crowns, were used. The zirconium cores samples were fabricated by a CAD/CAM device. Group A was left uncolored, Groups B was submerged for two minutes in A2 coloring liquid and Group C was stained with brush. Then all cores were sintered and the porcelain was applied by using the layering technique. Ultimately, the crowns color was determined using a spectrophotometer. Their color changing (∆E) and value changing (∆L) in relation to A2 color were also assessed. The data were analyzed with one-sample t-test, post-hoc Tukey, and one-way ANOVA tests with significant level set at 0.05. </div><div>  <b>Results</b>: The mean value in all groups was higher than the value obtained from A2 color samples (p= 0.001). The highest mean value was 78.31±1.22 belonging to group C (staining with brush) and the lowest mean value was 76.99±0.65 belonging to group B (submerging). The results of post-hoc Tukey regarding both ∆E and ∆L variables showed a significant difference between groups A (uncolored) and C (staining with brush) with P∆E=0.006 and P∆L=0.039, respectively. A significant difference between group B (submerging technique) and C (staining with brush) were shown when these two variables were compared (P∆E=0.001, P∆L=0.015).</div><div><b> Conclusion:</b> Due to the higher value increase in surface staining (brush), it is recommended to use the submerging technique for staining zirconia cores.</div><hr><p class="MsoNormal" style="text-align: left direction: ltr unicode-bidi: embed"><b>Source: </b>Journal of Dentistry Shiraz University of Medical Sciences </p> <p class="MsoNormal" style="text-align: left direction: ltr unicode-bidi: embed"><a href="http://dentjods.sums.ac.ir/index.php/JDSUMS/article/view/672" target="_blank"><font color="#0000ff">Full Text</font></a></p> 0 0 http://idai.ir/browse.php?a_code=A-10-32-3129&slc_lang=fa&sid=1 Ahmad Hassan Ahangari 100319475328460014452 100319475328460014452 No Dept. of Prosthodontics, School of Dentistry, Shiraz University of Medical Sciences, Shiraz, Iran Kianoosh Torabi Ardakani torabik@yahoo.com 100319475328460014453 100319475328460014453 Yes Dept. of Prosthodontics, School of Dentistry, Shiraz University of Medical Sciences, Shiraz, Iran. Farideh Mahdavi 100319475328460014454 100319475328460014454 No Dept. of Prosthodontics, School of Dentistry, Shiraz University of Medical Sciences, Shi- raz, Iran Mahshid Torabi Ardakani 100319475328460014455 100319475328460014455 No