fa Translucency and Masking Ability of Various Composite Resins at Different Thicknesses ترمیمی Cosmetic and Restorative Dentistry پژوهشي Research <b> Statement of the Problem</b>: Optical properties of the composite resins, concerning their translucency and thickness, are affected by discolored tooth structure or inherent darkness of the oral cavity. <div>  <b>Purpose:</b> This study aimed to compare the translucency parameter (TP) of five different composite resins in different thicknesses and to evaluate their masking ability in black backgrounds. </div><div>  <b>Materials and Method:</b> Five brands of composite resins Gradia (GC) and Crystalline (Confi-dental) in opaque A2 (OA2), Vit-l-escence (Ultradent) in opaque snow (OS), Herculite XRV (Kerr) and Opallis (FGM) in dentin A2 (DA2) shades were selected to enroll the study. Color coordinates of each composite were determined at 0.5, 1, and 1.5 mm thicknesses on a white backing. The backing of material itself and a black backing were calculated by using a spectrophotometer to evaluate the translucency parameter (TP) of the study materials. The masking ability was also calculated from the specimens on the material itself and on black backing. The values under 2 were estimated as imperceptible. One-way ANOVA, T-test and Tukey HSD were employed for statistical analysis. </div><div>  <b>Results: </b>The masking ability values, recorded for the 1.5 mm-thick specimens, were in the range of imperceptible except for the Herculite. There was no difference in TP values of the materials at 1.5 mm thickness. Opaque snow shade of Vit-l-escence and opaque A2 shade of Gradia showed lower TP values in comparison with the other 1 and 0.5 mm-thick materials and this difference was statistically significant (p< 0.05). </div><div>  <b>Conclusion: </b>In relatively thin thicknesses (≤1mm), these opaque/dentin shade composite resins could not mask the black background color.</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/743" target="_blank"><font color="#0000ff">Full Text</font></a></p> Translucency, Composite resins, Masking, Thickness 0 0 http://idai.ir/browse.php?a_code=A-10-32-3083&slc_lang=fa&sid=1 farideh Darabi f_darabi2002@yahoo.com 100319475328460014259 100319475328460014259 Yes Oromaxillofacial Developmental Disease Research Center, Dept. of Operative Dentistry, School of Dentistry, Guilan University of Medical Sciences, Rasht, Iran. Golpar Radafshar 100319475328460014260 100319475328460014260 No Oromaxillofacial Developmental Disease Research Center, Dept. of Periodontology, School of Dentistry, Guilan University of Medical Sciences, Rasht, Iran Maryam Tavangar 100319475328460014261 100319475328460014261 No Oromaxillofacial Developmental Disease Research Center, Dept. of Operative Dentistry, School of Dentistry, Guilan University of Medical Sciences, Rasht, Iran Reza Davaloo 100319475328460014262 100319475328460014262 No Oromaxillofacial Developmental Disease Research Center, Dept. of Operative Dentistry, School of Dentistry, Guilan University of Medical Sciences, Rasht, Iran Aref Khosravian 100319475328460014263 100319475328460014263 No Nastaran Mirfarhadi 100319475328460014264 100319475328460014264 No MS in Nursing Education, Oromaxillofacial Developmental Disease Research Center, School of Dentistry, Guilan University of Medi- cal Sciences, Rasht, Iran