Butler Sheila, Santos Gildo C, Santos Maria J C
Quintessence Int. 2021 Dec 1;53(1):8-14. doi: 10.3290/j.qi.b1901343.
The opacity of the zirconia ceramic restoration may influence the degree of conversion (%DC) of dual-cured resin cements. The aim of this study was to evaluate the degree of conversion of resin luting agents photocured under different high translucency zirconia shades. The opacity of each ceramic shade was evaluated.
The opacity percentage of Lava Frame and three Lava Plus High Translucency Zirconia ceramic shades (W1, A2, and B4) was determined. A spectrophotometer MiniScan was used to measure the opacity percentage of each specimen (0.7 mm thick) and then the opacity was calculated. Specimens from three different resin cements (Panavia F2.0, RelyX Unicem 2 Automix Self-Adhesive, and PermaFlo DC) were prepared with 100-µm thickness. The specimens were photocured according to the manufacturers' instructions under a ceramic block (0.7 mm thick). Specimens photocured without the ceramic block were used as control. Fifteen groups (n = 3) were evaluated. Micro-ATR/FTIR (micro-attenuated total reflectance/Fourier-transformed infrared spectroscopy) spectrometry was used to evaluate the extent of polymerization of all specimens after 24 hours. The %DC was determined using experimentally polymerized versus maximally polymerized composite.
The opacity percentages (mean ± SD) of W1, Lava Frame, A2, and B4 ceramics were 72.41% ± 0.04%, 74.24% ± 0.09%, 77.63% ± 0.11%, and 78.17% ± 0.12%, respectively. There was a statistically significant difference in %DC among the different cements investigated (P = .003) and a statistical difference in %DC was also found among the different ceramic shades studied (P = .030). For the Lava Frame and A2 ceramic blocks, the resin cements tested presented the lowest %DC except for the RelyX Unicem resin cement.
The %DC of RelyX Unicem 2 cement under low zirconia opacities (W1 and Lava Frame) was greater compared to high zirconia opacities (A2 and B4). For the Panavia F2.0 cement, no effect on the %DC under different high translucency shades was observed. The highest %DC of PermaFlo cement was exhibited when the ceramic shade W1 was used.
Dual-cured resin cements exhibited different degrees of conversion depending on the opacity of the zirconia restoration. However, different brands demonstrated higher or lower dependency of the light transmittance on their degree of conversion.
氧化锆陶瓷修复体的不透明度可能会影响双固化树脂水门汀的固化转化率（%DC）。本研究的目的是评估在不同高透明度氧化锆色度下光固化的树脂粘结剂的固化转化率。对每种陶瓷色度的不透明度进行了评估。
测定了Lava Frame和三种Lava Plus高透明度氧化锆陶瓷色度（W1、A2和B4）的不透明度百分比。使用MiniScan分光光度计测量每个标本（0.7毫米厚）的不透明度百分比，然后计算不透明度。制备了三种不同树脂水门汀（Panavia F2.0、RelyX Unicem 2自动混合自粘结和PermaFlo DC）厚度为100μm的标本。根据制造商的说明，在陶瓷块（0.7毫米厚）下对标本进行光固化。没有陶瓷块光固化的标本用作对照。评估了15组（n = 3）。使用微衰减全反射/傅里叶变换红外光谱（Micro-ATR/FTIR）光谱法评估所有标本在24小时后的聚合程度。使用实验聚合与最大聚合复合材料来确定%DC。
W1、Lava Frame、A2和B4陶瓷的不透明度百分比（平均值±标准差）分别为72.41%±0.04%、74.24%±0.09%、77.63%±0.11%和78.17%±0.12%。在所研究的不同水门汀中，%DC存在统计学显著差异（P = .003），在所研究的不同陶瓷色度中，%DC也存在统计学差异（P = .030）。对于Lava Frame和A2陶瓷块，除RelyX Unicem树脂水门汀外，测试的树脂水门汀呈现出最低的%DC。
与高氧化锆不透明度（A2和B4）相比，RelyX Unicem 2水门汀在低氧化锆不透明度（W1和Lava Frame）下的%DC更高。对于Panavia F2.0水门汀，在不同高透明度色度下对%DC没有影响。使用陶瓷色度W1时，PermaFlo水门汀表现出最高的%DC。
双固化树脂水门汀根据氧化锆修复体的不透明度表现出不同程度的固化转化率。然而，不同品牌在光透射率对其固化转化率的依赖性上表现出较高或较低的差异。
