*Priscila Regis Pedreira, Department of Restorative Dentistry, Piracicaba Dental School, State University of Campinas, Piracicaba, SP, Brazil.
Janaina Emanuela Damasceno, Department of Restorative Dentistry, Piracicaba Dental School, State University of Campinas, Piracicaba, SP, Brazil.
Oper Dent. 2021 Sep 1;46(5):566-576. doi: 10.2341/20-020-L.
To evaluate how adding different concentrations of particles (barium or zirconium oxide 25%/45% by weight) to a commercial infiltrant (Icon) and an experimental infiltrant influences cohesive strength (CS), degree of conversion (DC), water sorption (WS), solubility (SL), radiopacity, and penetration depth.
Microtensile CS (n=10) was evaluated using a universal testing machine. DC (n=5) was evaluated in a Fourier-transform infrared spectrometer. Polymerized samples were dissected, weighed, and stored to obtain the final mass for WS and SL tests (n=10). Radiopacity analysis (n=5) was performed using a digital radiography system. Penetration depth analysis (n=5) was performed by confocal laser scanning microscopy. Analyses were performed using the R program, with a significance level of 5%, except for the penetration depth analyses, which were evaluated only qualitatively.
The groups with 45% zirconium showed greater CS values, regardless of the infiltrant. Among the groups with no particle addition, those of the experimental infiltrant presented higher DC than those of Icon. The experimental infiltrant presented lower WS than Icon. All groups had SL below the ISO recommended levels. Radiopacity higher than 2.24 mmAl (enamel radiopacity) was observed only in the groups with 45% zirconium. All the groups achieved similar penetration depth, but the groups containing experimental infiltrant appear to have had longer tag extensions.
Addition of 45% of zirconium presented good results for CS and WS, as well as SL below the ISO recommended standard, adequate radiopacity, and penetration depth similar to the other groups.
评估向商业渗透剂（Icon）和实验性渗透剂中添加不同浓度的颗粒（钡或氧化锆 25%/45%重量）对黏结强度（CS）、转化率（DC）、吸水率（WS）、溶解度（SL）、射线可探测性和渗透深度的影响。
使用万能试验机评估微拉伸 CS（n=10）。在傅里叶变换红外光谱仪中评估 DC（n=5）。将聚合后的样品进行解剖、称重并储存，以获得 WS 和 SL 测试的最终质量（n=10）。使用数字射线照相系统进行射线可探测性分析（n=5）。使用共聚焦激光扫描显微镜进行渗透深度分析（n=5）。除了渗透深度分析仅进行定性评估外，使用 R 程序进行所有分析，显著性水平为 5%。
无论渗透剂如何，添加 45%氧化锆的组均表现出更高的 CS 值。在未添加颗粒的组中，实验性渗透剂的 DC 高于 Icon。实验性渗透剂的 WS 低于 Icon。所有组的 SL 均低于 ISO 推荐水平。仅在添加 45%氧化锆的组中观察到高于 2.24mmAl（釉质射线可探测性）的射线可探测性。所有组的渗透深度相似，但含有实验性渗透剂的组似乎具有更长的标记延伸。
添加 45%氧化锆可实现 CS 和 WS 的良好效果，同时 SL 低于 ISO 推荐标准，射线可探测性适中，渗透深度与其他组相似。
