Effect of lithium disilicate ceramic thickness, shade and translucency on transmitted irradiance and knoop microhardness of a light cured luting resin cement.
Effect of lithium disilicate ceramic thickness, shade and translucency on transmitted irradiance and knoop microhardness of a light cured luting resin cement.
复制标题
DOI：
10.1007/s10856-021-06562-2
复制
发表时间：
2021-07-31
期刊：
影响因子：
--
通讯作者：
Costa AR
中科院分区：
文献类型：
--
作者：
Borges LPS;Borges GA;Correr AB;Platt JA;Kina S;Correr-Sobrinho L;Costa AR
本体外研究评估了压实二硅酸锂的厚度、阴影和半透明度对光固化树脂水泥在两个深度下的透射辐照度和Knoop显微硬度（KHN）的影响。制作了135个IPS e.max Press （Ivoclar Vivadent）陶瓷圆盘，并根据其透明度的相关性分为27组（n = 5）： HT（高半透明）、LT（低半透明）和MO（中不透明）；色度：BL2、A1、A3.5；厚度：0.5 mm、1.5 mm、2.0 mm。每个陶瓷圆盘的一面都经过抛光和上釉处理。用电位器（Ophir 10ª-V2-SH, Ophir Optronics）评估了多波LED光固化单元（Valo, Ultradent）的辐照度（mW/cm²），没有（对照组）或插入陶瓷样品。在100 μm和700 μm两个深度，24 h后评估Variolink aesthetic LC树脂水泥（Ivoclar Vivadent）的显微硬度。数据进行方差分析，然后进行Tukey检验（α = 0.05）。陶瓷厚度（p < 0.0001）、阴影（p < 0.001）、半透明度（p < 0.0001）和深度（p < 0.0001）对辐照度和KHN有显著影响。结论：增加陶瓷厚度的介入可显著降低树脂水泥的辐照度和显微硬度。增加树脂水泥的深度，所有研究组的显微硬度都显著降低。陶瓷不透明度的增加降低了树脂水泥在所有陶瓷厚度和色调下的KHN。
This in vitro study evaluates the influence of pressed lithium disilicate thickness, shade and translucency on the transmitted irradiance and the Knoop microhardness (KHN) of a light-cured resin cement at two depths. One hundred and thirty-five ceramic discs of IPS e.max Press (Ivoclar Vivadent) were fabricated and divided into twenty-seven groups (n = 5) according to the association between translucency: HT (hight translucency), LT (low translucency), and MO (medium opacity); shade: BL2, A1 and A3.5; and thickness: 0.5 mm, 1.5 mm, and 2.0 mm. One side of each ceramic disc was finished, polished and glazed. The irradiance (mW/cm²) of a multiwave LED light curing unit (Valo, Ultradent) was evaluated with a potentiometer (Ophir 10ª-V2-SH, Ophir Optronics) without (control group) or with interposition of ceramic samples. The microhardness of Variolink Esthetic LC resin cement (Ivoclar Vivadent) was evaluated after 24 h at two depths (100 μm and 700 μm). Data were submitted to ANOVA followed by Tukey’s test (α = 0.05). Irradiance and KHN were significantly influenced by ceramic thickness (p < 0.0001), shade (p < 0.001), translucency (p < 0.0001) and depth (p < 0.0001). Conclusions: the interposition of increasing ceramic thicknesses significantly reduced the irradiance and microhardness of resin cement. Increased depth in the resin cement showed significantly reduced microhardness for all studied groups. Increased ceramic opacity reduced the KHN of the resin cement at both depths for all ceramic thicknesses and shades.
登录
查看更多内容
影响因子：
5
作者：
Heintze, S. D.;Albrecht, T.;Steiner, M.
通讯作者：
Steiner, M.
影响因子：
2.2
作者：
Borges, G. A.;Agarwal, P.;Santos, P. H.
通讯作者：
Santos, P. H.
影响因子：
1.8
作者：
Aguiar, Flvio H. B.;Andrade, Kelly R. M.;Lovadino, Jose R.
通讯作者：
Lovadino, Jose R.
影响因子：
2.5
作者：
Calgaro, Patricia Angelica Milani;Furuse, Adilson Yoshio;Gonzaga, Carla Castiglia
通讯作者：
Gonzaga, Carla Castiglia
影响因子：
2.2
作者：
Meereis, C. T. W.;de Souza, G. B. F.;Lima, G. S.
通讯作者：
Lima, G. S.