Department of Operative Dentistry, Nihon University School of Dentistry, 1-8-13, Kanda-Surugadai, Chiyoda-Ku, Tokyo 101-8310, Japan.
J Dent. 2012 Feb;40(2):131-8. doi: 10.1016/j.jdent.2011.11.012. Epub 2011 Nov 22.
The surface free energy and dentine bond strength of self-adhesive cements were examined after the removal of temporary cements.
The labial dentine surfaces of bovine mandibular incisors were wet ground with #600-grit SiC paper. Acrylic resin blocks were luted to the prepared dentine surfaces using HY Bond Temporary Cement Hard (HY), IP Temp Cement (IP), Fuji TEMP (FT) or Freegenol Temporary Cement (TC), and stored for 1 week. After removal of the temporary cements with an ultrasonic tip, the contact angle values of five specimens per test group were determined for the three test liquids, and the surface-energy parameters of the dentine surfaces were calculated. The dentine bond strengths of the self-adhesive cements were measured after removal of the temporary cements in a shear mode at a crosshead speed of 1.0mm/min. The data were subjected to one-way analysis of variance (ANOVA) followed by Tukey's HSD test.
For all surfaces, the value of the estimated surface tension component γ(S)(d) (dispersion) was relatively constant at 41.7-43.3 mJm(-2). After removal of the temporary cements, the value of the γ(S)(h) (hydrogen-bonding) component decreased, particularly with FT and TC. The dentine bond strength of the self-adhesive cements was significantly higher for those without temporary cement contamination (8.2-10.6 MPa) than for those with temporary cement contamination (4.3-7.1 MPa).
The γ(S) values decreased due to the decrease of γ(S)(h) values for the temporary cement-contaminated dentine. Contamination with temporary cements led to lower dentine bond strength.
The presence of temporary cement interferes with the bonding performance of self-adhesive cements to dentine. Care should be taken in the methods of removal of temporary cement when using self-adhesive cements.
研究在去除暂封材料后自粘接水门汀的表面自由能和牙本质粘接强度的变化。
使用#600 粒度 SiC 砂纸湿磨牛下颌切牙唇面牙本质。将丙烯酸树脂块用 HY Bond Temporary Cement Hard（HY）、IP Temp Cement（IP）、Fuji TEMP（FT）或 Freegenol Temporary Cement（TC）黏结到预备好的牙本质表面，保存 1 周。用超声工作尖去除暂封材料后，对每组 5 个样本进行 3 种测试液的接触角值测量，并计算牙本质表面的表面能参数。在去除暂封材料后，用剪切模式以 1.0mm/min 的十字头速度测量自粘接水门汀的牙本质粘接强度。对数据进行单因素方差分析（ANOVA），然后进行 Tukey 检验。
对于所有表面，估算的表面张力分量γ(S)(d)（色散）值相对恒定，为 41.7-43.3mJ/m²。去除暂封材料后，γ(S)(h)（氢键）分量值降低，FT 和 TC 尤其如此。自粘接水门汀的牙本质粘接强度在无暂封材料污染时显著更高（8.2-10.6MPa），而在有暂封材料污染时显著更低（4.3-7.1MPa）。
由于暂封材料污染牙本质的γ(S)(h)值降低，γ(S)值降低。暂封材料的污染导致牙本质粘接强度降低。
暂封材料的存在会干扰自粘接水门汀与牙本质的粘结性能。使用自粘接水门汀时，应注意去除暂封材料的方法。
