Chen W X, Bao X D, Yue L
Beijing Da Xue Xue Bao Yi Xue Ban. 2020 Dec 18;52(6):1117-1123. doi: 10.19723/j.issn.1671-167X.2020.06.022.
To explore the conversion of resin monomer, the change of inorganic component and the influencing factors on the oxygen inhibition layer formed on the cured surface of resin cement.
Three kinds of resin cement were divided into three groups: (1) light-cured group: RelyX Veneer, NX3 (light-cured), Variolink N; (2) dual-cured group: RelyX U200 Automix, NX3 (dual-cured), Multilink Speed; (3) chemically-cured group, and the above 3 types of dual-cured resin cement cured without illumination could be used as chemically-cured resin cement. Each sample was provided with and without oxygen exposure of two matching surfaces, cured respectively, and the variables of light intensity and illumination time were set in the light-cured group and the dual-cured group. Scanning electron microscopy was used to observe the samples' surface morphology. Energy dispersive spectrometer was used to analyze the samples' composition of surface elements. Confocal Raman spectroscopy was used to measure the monomer conversion of resin cement and to obtain the thickness of the oxygen inhibition layer.
(1) On the surface of cured resin cement, the weight percentage of oxygen element in the aerobic side was higher than that in the anaerobic side ( < 0.05), and the weight percentage of inorganic element was lower than that in the anaerobic side ( < 0.05). (2) The surface monomer conversion of the cured resin cement on the aerobic surface was significantly lower than that on the anaerobic surface ( < 0.05), and the surface monomer conversion on the aerobic surface and the anaerobic surface was the lowest in the chemically-cured group ( < 0.05), the dual-cured group was the highest ( < 0.05), and the light-cured group was between them. With the increase of light intensity or illumination time, the surface monomer conversion increased ( < 0.05). (3) The thickness of the oxygen inhibition layer was the thickest in the chemically-cured group [(40.27±2.81) μm]( < 0.05), the thinnest in the dual-cured group [(21.87±5.42) μm]( < 0.05) and light-cured group [(23.73±3.84) μm] was between them. With the increase of light intensity or illumination time, the thickness of the oxygen inhibition layer of resin cement decreased ( < 0.05).
When resin cement is exposed to oxygen, it will form an oxygen inhibition layer, its surface's inorganic filler is less, the surface monomer conversion is lower. The surface monomer conversion and the thickness of oxygen inhibition layer are affected by curing mode and illumination factors.
探讨树脂单体的转化率、无机成分的变化以及对树脂水门汀固化表面形成的氧抑制层的影响因素。
将三种树脂水门汀分为三组：（1）光固化组：RelyX Veneer、NX3（光固化）、Variolink N；（2）双重固化组：RelyX U200 Automix、NX3（双重固化）、Multilink Speed；（3）化学固化组，上述3种双重固化树脂水门汀未光照固化时可作为化学固化树脂水门汀。每个样品的两个匹配表面分别设置有氧暴露和无氧暴露，分别进行固化，光固化组和双重固化组设置光强度和光照时间变量。采用扫描电子显微镜观察样品表面形态。采用能谱仪分析样品表面元素组成。采用共聚焦拉曼光谱法测定树脂水门汀的单体转化率并获得氧抑制层的厚度。
（1）在固化树脂水门汀表面，有氧侧氧元素的重量百分比高于无氧侧（P<0.05），无机元素重量百分比低于无氧侧（P<0.05）。（2）固化树脂水门汀有氧表面单体转化率显著低于无氧表面（P<0.05），有氧表面和无氧表面的表面单体转化率在化学固化组最低（P<0.05），双重固化组最高（P<0.05），光固化组介于两者之间。随着光强度或光照时间增加，表面单体转化率升高（P<0.05）。（3）氧抑制层厚度化学固化组最厚[（40.27±2.81）μm]（P<0.05）；双重固化组最薄[（21.87±5.42）μm]（P<0.05），光固化组[（23.73±3.84）μm]介于两者之间。随着光强度或光照时间增加树脂水门汀氧抑制层厚度减小（P<0.05）。
树脂水门汀暴露于氧气时会形成氧抑制层，其表面无机填料较少，表面单体转化率较低。表面单体转化率和氧抑制层厚度受固化方式和光照因素影响。
