Department of Conservative Dentistry and Endodontics, Kalka Dental College and Hospital, Partapur, Meerut, Uttar Pradesh, India.
Department of Conservative Dentistry and Endodontics, Kothiwal Dental College and Research Centre, Moradabad, Uttar Pradesh, India.
J Contemp Dent Pract. 2024 Jan 1;25(1):35-40. doi: 10.5005/jp-journals-10024-3611.
The aim of the present study was to evaluate the shear bond strength of resin-modified glass ionomer cement with two different types of mineral trioxide aggregate at different time intervals.
A total of 80 cylindrical blocks were prepared using a self-cure acrylic resin with a central cavity of 4 mm internal diameter and 2 mm height. The prepared samples were randomly divided into two groups ( = 40 each) according to the type of MTA cements used (ProRoot MTA and MTA Angelus). Two groups were further sub-divided into four sub-groups of 10 samples each according to the different time intervals. ProRoot MTA and MTA Angelus were placed in the prepared cavity and a wet cotton pellet was placed over the filled cavity. A hollow plastic tube was placed over the MTA surface and resin-modified glass ionomer cement (RMGIC) was placed into the hollow plastic tube and light-cured (Spectrum 800, Dentsply Caulk Milford, DE, USA) according to the time intervals decided. After light curing the plastic tubes were removed carefully and the specimens were stored at 37°C and 100% humidity for 24 hours to encourage setting of MTA. The specimens were mounted in a universal testing machine (ADMET) and a crosshead speed of 0.5 mm/min was applied to each specimen by using a knife-edge blade until the bond between the MTA and RMGIC failed. The data were statistically analyzed using ANOVA, Tukey's -test and Fisher's -test and -value ≤ 0.5 was considered significant.
For both ProRoot MTA and MTA Angelus there was no statistically significant difference between 45 minutes and 24 hours (-value ≥ 0.8). For ProRoot MTA, shear bond strength value at 10 minutes were significantly lower than 45 minutes and 24 hours group. However, for MTA Angelus, shear bond strength value at 10 minute was not significantly different from 45 minutes group (-value ≥ 0.3). For both ProRoot MTA and MTA Angelus shear bond strength value at 0 minute were the least and were significantly lower than 10 minutes, 45 minutes, and 24 hours, respectively (-value ≥ 0.000).
Resin-modified glass ionomer cement can be layered over MTA Angelus after it is allowed to set for 10 minutes. However, ProRoot MTA should be allowed to set for at least 45 minutes before the placement of RMGIC to achieve better shear bond strength.
Due to the variety of types of mineral trioxide aggregate cements available in dentistry, it is justifiable to emphasize on different time intervals as it may affect the shear bond strength of restorative cements. Such information is pivotal for the clinicians while using mineral aggregate-based cements that receive forces from the condensation of restorative materials or occlusion, as the compressive strength may be affected due to different time intervals. How to cite this article: Tyagi N, Chaman C, Anand S, . Comparative Evaluation of Shear Bond Strength of Resin-modified Glass Ionomer Cement with ProRoot MTA and MTA Angelus. J Contemp Dent Pract 2024;25(1):35-40.
本研究旨在评估两种不同类型的矿化三氧化物凝聚体（MTA）在不同时间间隔下对树脂改良型玻璃离子水门汀的剪切粘结强度。
使用自固化丙烯酸树脂制备 80 个圆柱形块，中央腔内径为 4mm，高度为 2mm。根据使用的 MTA 水泥的类型（ProRoot MTA 和 MTA Angelus），将制备的样本随机分为两组（每组 40 个）。根据不同的时间间隔，将两组进一步分为四个亚组，每组 10 个样本。将 ProRoot MTA 和 MTA Angelus 放置在准备好的腔中，并在填充的腔上放置一个湿棉丸。将一个空心塑料管放置在 MTA 表面上，并根据决定的时间间隔将树脂改良型玻璃离子水门汀（RMGIC）放入空心塑料管中并进行光固化（Spectrum 800，Dentsply Caulk Milford，DE，USA）。光固化后，小心地取出塑料管，将样本储存在 37°C 和 100%湿度下 24 小时，以促进 MTA 的凝固。将样本安装在万能试验机（ADMET）上，使用刃口刀片以 0.5mm/min 的十字头速度施加到每个样本上，直到 MTA 和 RMGIC 之间的粘结失效。使用方差分析、Tukey's -test 和 Fisher's -test 对数据进行统计学分析， - 值≤0.5 被认为具有统计学意义。
对于 ProRoot MTA 和 MTA Angelus，45 分钟和 24 小时之间没有统计学上的显著差异（ - 值≥0.8）。对于 ProRoot MTA，10 分钟的剪切粘结强度值明显低于 45 分钟和 24 小时组。然而，对于 MTA Angelus，10 分钟的剪切粘结强度值与 45 分钟组没有显著差异（ - 值≥0.3）。对于 ProRoot MTA 和 MTA Angelus，0 分钟的剪切粘结强度值最低，明显低于 10 分钟、45 分钟和 24 小时组（ - 值≥0.000）。
MTA Angelus 凝固 10 分钟后，可以在其上分层放置树脂改良型玻璃离子水门汀。然而，在放置 RMGIC 之前，ProRoot MTA 应至少凝固 45 分钟，以获得更好的剪切粘结强度。
由于牙科中可用的矿化三氧化物凝聚体水泥种类繁多，强调不同的时间间隔是合理的，因为这可能会影响修复用水泥的剪切粘结强度。这些信息对于在使用受修复材料或咬合压力的矿化骨料基水泥时的临床医生来说至关重要，因为不同的时间间隔可能会影响抗压强度。
