Sokolowski Grzegorz, Szczesio Agata, Bociong Kinga, Kaluzinska Karolina, Lapinska Barbara, Sokolowski Jerzy, Domarecka Monika, Lukomska-Szymanska Monika
Department of Prosthetic Dentistry, Medical University of Lodz, 251 Pomorska St., 92-213 Lodz, Poland.
University Laboratory of Materials Research, Medical University of Lodz, 251 Pomorska St., 92-213 Lodz, Poland.
Materials (Basel). 2018 Jun 8;11(6):973. doi: 10.3390/ma11060973.
Resin matrix dental materials undergo contraction and expansion changes due to polymerization and water absorption. Both phenomena deform resin-dentin bonding and influence the stress state in restored tooth structure in two opposite directions. The study tested three composite resin cements (Cement-It, NX3, Variolink Esthetic DC), three adhesive resin cements (Estecem, Multilink Automix, Panavia 2.0), and seven self-adhesive resin cements (Breeze, Calibra Universal, MaxCem Elite Chroma, Panavia SA Cement Plus, RelyX U200, SmartCem 2, and SpeedCEM Plus). The stress generated at the restoration-tooth interface during water immersion was evaluated. The shrinkage stress was measured immediately after curing and after 0.5 h, 24 h, 72 h, 96 h, 168 h, 240 h, 336 h, 504 h, 672 h, and 1344 h by means of photoelastic study. Water sorption and solubility were also studied. All tested materials during polymerization generated shrinkage stress ranging from 4.8 MPa up to 15.1 MPa. The decrease in shrinkage strain (not less than 57%) was observed after water storage (56 days). Self-adhesive cements, i.e., MaxCem Elite Chroma, SpeedCem Plus, Panavia SA Plus, and Breeze exhibited high values of water expansion stress (from 0 up to almost 7 MPa). Among other tested materials only composite resin cement Cement It and adhesive resin cement Panavia 2.0 showed water expansion stress (1.6 and 4.8, respectively). The changes in stress value (decrease in contraction stress or built up of hydroscopic expansion) in time were material-dependent.
树脂基质牙科材料会因聚合和吸水而发生收缩和膨胀变化。这两种现象都会使树脂与牙本质的粘结变形，并在两个相反方向上影响修复后牙齿结构中的应力状态。该研究测试了三种复合树脂粘结剂（Cement-It、NX3、Variolink Esthetic DC）、三种粘结性树脂粘结剂（Estecem、Multilink Automix、Panavia 2.0）以及七种自粘结树脂粘结剂（Breeze、Calibra Universal、MaxCem Elite Chroma、Panavia SA Cement Plus、RelyX U200、SmartCem 2和SpeedCEM Plus）。评估了水浸过程中修复体与牙齿界面处产生的应力。通过光弹性研究在固化后以及0.5小时、24小时、72小时、96小时、168小时、240小时、336小时、504小时、672小时和1344小时后测量收缩应力。还研究了吸水率和溶解度。所有测试材料在聚合过程中产生的收缩应力范围为4.8兆帕至15.1兆帕。储水（56天）后观察到收缩应变降低（不少于57%）。自粘结粘结剂，即MaxCem Elite Chroma、SpeedCem Plus、Panavia SA Plus和Breeze表现出较高的水膨胀应力值（从0到近7兆帕）。在其他测试材料中，只有复合树脂粘结剂Cement It和粘结性树脂粘结剂Panavia 2.0显示出水膨胀应力（分别为1.6和4.8）。应力值随时间的变化（收缩应力降低或吸湿膨胀增加）取决于材料。
