fa Light Transmission through Three Types of Translucent Zirconia ترمیمی Cosmetic and Restorative Dentistry پژوهشي Research <p style="background-color: rgb(239, 243, 250)"><strong style="margin: 0px padding: 0px border: 0px"><i style="margin: 0px padding: 0px border: 0px"> Objective: </i></strong>Zirconia cores have limited light transmittance and data are scarce on light transmission through zirconia cores with and without the veneering ceramic.</p><p style="background-color: rgb(239, 243, 250)"> <strong style="margin: 0px padding: 0px border: 0px"><i style="margin: 0px padding: 0px border: 0px"> Methods: </i></strong>In this <i style="margin: 0px padding: 0px border: 0px">in vitro</i> study, Disc-shaped specimens (11.5 mm in diameter and 0.4 (0.05) mm in thickness) were fabricated of three types of zirconia namely Mamut, Heany and ZirkonZahn (n=5). A disc-shaped specimen (11.5 mm in diameter and 0.65 (0.05) mm in thickness) of veneering ceramic (Cerabien ZR, Kuraray, Noritake, Japan) was also fabricated. The intensity of light transmitted through the zirconia specimens with and without the veneering ceramic was recorded using a light curing unit (LED, SDI Radii Plus, Australia) and its respective radiometer (LED Radiometer, SDI, Australia). Data were analyzed using repeated measures ANOVA and Tukey’s HSD test.</p><p style="background-color: rgb(239, 243, 250)"> <strong style="margin: 0px padding: 0px border: 0px"><i style="margin: 0px padding: 0px border: 0px"> Results: </i></strong>A significant difference was noted in light transmission among different types of zirconia before and after veneering. After veneering, light transmission decreased in all specimens and the reduction in light transmission in Zirkonzahn group was significantly greater than that in Heany and Mamut groups (<i style="margin: 0px padding: 0px border: 0px">p</i><0.001).</p><p style="background-color: rgb(239, 243, 250)"> <strong style="margin: 0px padding: 0px border: 0px"><i style="margin: 0px padding: 0px border: 0px"> Conclusion: </i></strong>Veneered zirconia systems have limited translucency and ceramic veneering significantly decreases light transmission through zirconia.</p><hr><p class="MsoNormal" style="text-align: left direction: ltr unicode-bidi: embed"><b>Source: </b>Journal of Dental School Shahid Beheshti University of Medical Sciences </p> <p class="MsoNormal" style="text-align: left direction: ltr unicode-bidi: embed"><a href="http://jds.sbmu.ac.ir/browse.php?a_id=1405&sid=1&slc_lang=en" target="_blank"><font color="#0000ff">Full Text</font></a></p> Dental ceramics, Opacity, Porcelain veneer, Thickness, Translucency, Zirconium., 0 0 http://idai.ir/browse.php?a_code=A-10-32-2954&slc_lang=fa&sid=1 Maryam Abdo Tabrizi 100319475328460013732 100319475328460013732 No Dept. of Restorative Dentistry, School of Dentistry, Shahid Beheshti University of Medical Sciences, Tehran, Iran Fatemeh Abdo Tabrizi 100319475328460013733 100319475328460013733 No Dept. of Restorative Dentistry, School of Dentistry, Gilan University of Medical Sciences, Gilan, Iran Amir Ghassemi 100319475328460013734 100319475328460013734 No Dept. of Restorative Dentistry, School of Dentistry, Shahid Beheshti University of Medical Sciences, Tehran, Iran Ahmad Najafi 100319475328460013735 100319475328460013735 No Dept. of Restorative Dentistry, School of Dentistry, Shahid Beheshti University of Medical Sciences, Tehran, Iran Malihe Ekrami melika_200577@yahoo.com 100319475328460013736 100319475328460013736 Yes Dept. of Restorative Dentistry, School of Dentistry, Shahid Beheshti University of Medical Sciences, Tehran, Iran