Aim: The study aimed to estimate the shear bond strength (SBS) of various glass ionomer cements (GICs).

Materials and methods: Forty-eight extracted premolars were divided into 12 each groups after doing coronal sectioning 1 mm under the junction of enamel and dentin (DEJ) at perpendicular to the long axis of the tooth by utilizing a diamond disc at low speed and implanted into acrylic blocks of measuring 2 cm × 2 cm: Group 1: Conventional GIC (GC Gold Label 2, Japan), Group 2: Resin Modified GIC (GC Gold Label 2 LC, Japan), Group 3: Zirconia Reinforced GIC (Shofu Zirconomer Improved, Japan), and Group 4: Hydroxyapatite Modified GIC (Prevest Crysta Bioactive, India). Following the company's directions, the experimental materials were bonded to the samples using a plastic cylinder template. The specimens were incubated for a day at 37°C in artificial saliva. Last, the universal tester machine with a stainless-steel (SS) knife at a speed of 0.5 mm/min, which was positioned perpendicular to the junction that connected the material and dentin, was used to perform the shear bond test (SBS) until debonding and measured in Mega Pascals (MPa). One-way ANOVA was used to analyze the data.

Results: Associating mean SBS (MPa) among the groups showed a higher mean associated with group 3, followed by group 4, group 2, and then group 1, with a statistically significant difference.

Conclusion: The Zirconia Reinforced GIC showed the highest mean SBS than other different modifications of GIC.

Keywords: GIC; RMGIC; SBS; hydroxyapatite-modified GIC; zirconomer.

Copyright: © 2025 Journal of Pharmacy and Bioallied Sciences.

目的： 本研究旨在估计不同类型玻璃离子水泥（GICs）的剪切粘结强度（SBS）。

材料与方法： 将48颗拔除的前磨牙进行冠部切割，切割位置位于釉质和牙本质交界处（DEJ）下方1毫米，并垂直于牙齿长轴方向，使用低速金刚石砂轮完成。然后将其植入尺寸为2厘米×2厘米的丙烯酸树脂块中：第1组：传统玻璃离子水泥（GC Gold Label 2, 日本），第2组：树脂改良型玻璃离子水泥（GC Gold Label 2 LC, 日本），第3组：氧化锆增强型玻璃离子水泥（Shofu Zirconomer Improved, 日本）和第4组：羟基磷灰石改性型玻璃离子水泥（Prevest Crysta Bioactive, 印度）。根据厂家指导，实验材料使用塑料圆筒模板粘结到样品上。标本在人工唾液中于37°C条件下孵育一天。最后，使用带有不锈钢刀具、速度为0.5毫米/分钟的万能试验机，在垂直于连接材料与牙本质交界处的位置进行剪切粘结测试（SBS），直到脱离，并以兆帕（MPa）测量结果。数据采用单因素方差分析法进行分析。

结果： 各组平均剪切粘结强度（SBS，MPa）显示第3组的平均值最高，其次是第4组、第2组和最后是第1组，且差异具有统计学意义。

结论： 氧化锆增强型玻璃离子水泥表现出比其他不同改性的GIC更高的平均剪切粘结强度。

关键词： GIC；RMGIC；SBS；羟基磷灰石改良型GIC；Zirconomer。