Mokhtari Fatemeh, Akhondzadeh-Kashani Laleh, Modaresi Jalil
Department of Endodontics, Dental School, Shahid Sadoughi University of Medical Sciences, Yazd, Iran.
Dent Res J (Isfahan). 2024 Jul 12;21:43. eCollection 2024.
To provide a continuous seal of the root canal, root-filling material should bond to the root canal dentin, ensuring the integrity of both the root-filling material and dentin remains in a static and functional state. The present study assessed the push-out bond strength of mineral trioxide aggregate (MTA) and cold ceramic (CC).
In this laboratory trial study, 20 single-rooted, extracted human teeth without caries and cracks were selected. Each tooth was mounted in cold-curing resin. Then, 3 mm slices of mid-root dentin were obtained from each tooth. The specimens were randomly divided into two groups ( = 10) and filled with MTA ProRoot and CC. All specimens were stored for 30 days in an incubator at 37°C and 100% humidity. The push-out bond strength of the test materials was measured using a cylindrical punch with a 1-mm diameter. The punch was pushed against the test specimen at a speed of 1.0 mm/min using a universal material testing machine, extruding the filling test material. The push-out force during the test was recorded, and then, the internal surface of the teeth was examined to evaluate the mode of failure. Independent -test and Chi-square were used to analyze the data. < 0.05 was considered a significance threshold.
The mean push-out bond strength in the CC group was 24.58 (MPa), and in MTA ProRoot, it was 23.77. No significant difference was observed between the two groups. The most frequent mode of failure in both groups was adhesive failure.
The two materials have adequate push-out bond strength to root dentin, and there is no difference between the bond strength and mode of failure of the two materials.
为实现根管的持续封闭，根管充填材料应与根管牙本质结合，确保根管充填材料和牙本质的完整性保持在静态和功能状态。本研究评估了三氧化矿物凝聚体（MTA）和冷陶瓷（CC）的推出粘结强度。
在这项实验室试验研究中，选取了20颗无龋且无裂纹的单根拔除恒牙。每颗牙齿固定于冷固化树脂中。然后，从每颗牙齿获取牙根中部3mm厚的牙本质切片。将标本随机分为两组（每组n = 10），分别用MTA ProRoot和CC进行充填。所有标本在37°C、湿度100%的培养箱中保存30天。使用直径为1mm的圆柱形冲头测量测试材料的推出粘结强度。使用万能材料试验机以1.0mm/min的速度将冲头压向测试标本，挤出充填测试材料。记录测试过程中的推出力，然后检查牙齿的内表面以评估失败模式。采用独立样本t检验和卡方检验分析数据。P < 0.05被视为显著性阈值。
CC组的平均推出粘结强度为24.58（MPa），MTA ProRoot组为23.77。两组之间未观察到显著差异。两组中最常见的失败模式均为粘结失败。
这两种材料对牙根牙本质均具有足够的推出粘结强度，且两种材料的粘结强度和失败模式无差异。
