EVALUATION OF STAINLESS-STEEL CROWN CEMENTED WITH GLASS IONOMER CEMENT, RESIN MODIFIED GLASS IONOMER CEMENT AND NEW SELF-ADHESIVE RESIN CEMENT: AN INVITRO STUDY

Aim: To assess and compare the retentive strength of stainless-steel crown cemented with glass ionomer cement (GC Fuji I), resin modiifed glass ionomer cement (Relyx Luting 2) and new self-adhesive resin cement (RelyX U200). Materials and Method: Forty-five extracted primary teeth were mounted on acrylic blocks. Stainless steel crowns were selected for each tooth. Three cements compared in this in vitro study were glass ionomer cement (GC Fuji I), resin modified glass ionomer cement (RelyX Luting2) and self-adhesive resin cement (RelyX U200). Teeth were randomly divided into three groups of 15 samples each. Retentive strength was tested using Instron Universal testing machine. The retentive strength values were recorded and calculated by the formula: Load/Area. Results: RelyX U200 (Self-adhesive resin cement) showed significantly higher retentive strength than rest of the two cements. No significant difference was found between RelyX Luting 2 (Resin modified glass ionomer cement) and GC Fuji I (Glass ionomer cement). Conclusion: The finding of our study suggests that self-adhesive resin cement was better than resin modified glass ionomer cement and glass ionomer cement. RelyX U200 (Self-adhesive resin cement) can be used for the cementation of stainless-steel crowns.研究目的：本研究旨在评估并比较分别采用玻璃离子水门汀（glass ionomer cement, GC Fuji I）、树脂改性玻璃离子水门汀（resin modified glass ionomer cement, RelyX Luting 2）与新型自粘接树脂水门汀（self-adhesive resin cement, RelyX U200）粘接的不锈钢牙冠的固位强度。 材料与方法：选取45颗拔除的乳牙，固定于丙烯酸树脂块上，并为每颗乳牙制作适配的不锈钢牙冠。本体外研究对比的三种粘接剂分别为：玻璃离子水门汀（GC Fuji I）、树脂改性玻璃离子水门汀（RelyX Luting 2）与自粘接树脂水门汀（RelyX U200）。将所有样本随机分为3组，每组15例。采用英斯特朗万能试验机（Instron Universal testing machine）检测固位强度，固位强度值通过公式“载荷/面积”记录并计算得出。 结果：RelyX U200（自粘接树脂水门汀）的固位强度显著高于其余两种粘接剂。RelyX Luting 2（树脂改性玻璃离子水门汀）与GC Fuji I（玻璃离子水门汀）之间的固位强度无显著差异。 结论：本研究结果显示，自粘接树脂水门汀的固位效果优于树脂改性玻璃离子水门汀与玻璃离子水门汀。RelyX U200（自粘接树脂水门汀）可用于不锈钢牙冠的粘接固定。