Butt Naziya, Talwar Sangeeta, Chaudhry Sarika, Nawal Ruchika Roongta, Yadav Seema, Bali Anuradha
Department of Conservative Dentistry and Endodontics, Maulana Azad Institute of Dental Sciences, MAMC Complex, Bahadur Shah Zafar Marg, New Delhi, India.
Indian J Dent Res. 2014 Nov-Dec;25(6):692-7. doi: 10.4103/0970-9290.152163.
Mineral trioxide aggregate (MTA) fulfills many of the ideal properties of the root-end filling material. However, its low cohesive property often makes it difficult to handle. Biodentine, new calcium-silicate-based cement has been developed to improve some MTA drawbacks such as its difficult handling property and long-setting time.
The objective of this study was to compare at different times the microleakage of roots filled with Biodentine and white MTA (WMTA)-Angelus and to investigate their setting time, handling properties and compressive strength.
Root canals of single-rooted teeth were instrumented, filled with either Biodentine or WMTA-Angelus (n=15 each) with two positive and two negative control roots and stored at 37°C. Sealing was assessed at 4, 24 h, 1, 2, 4, 8, and 12 weeks by a fluid filtration method. The initial setting time, handling properties, and compressive strength of the test groups were investigated by a vicat needle, questionnaire of operational hand feel, and universal instron machine, respectively.
Significant differences in microleakage were found between two groups at 4-h and 24 h (P<0.05) and no difference at 1, 2, 4, 8, and 12 weeks. No significant difference was seen in the setting time of MTA-Angelus and Biodentine, though latter was found to have better handling consistency. Compressive strength of Biodentine was significantly higher than MTA-Angelus.
The results suggest that the new calcium-silicate-based endodontic cement provides improvement in sealing ability as well as clinical manageability of dental filling materials.
三氧化矿物凝聚体（MTA）具备根充材料的许多理想特性。然而，其低粘结性常使其操作困难。生物陶瓷，一种新型的钙硅基水门汀，已被研发出来以改善MTA的一些缺点，比如其操作困难和凝固时间长的问题。
本研究的目的是在不同时间比较用生物陶瓷和白色MTA（WMTA）-安杰卢斯充填的牙根的微渗漏情况，并研究它们的凝固时间、操作性能和抗压强度。
对单根牙的根管进行预备，分别用生物陶瓷或WMTA-安杰卢斯（每组n = 15）充填，设置两个阳性和两个阴性对照牙根，并在37°C下储存。通过液体过滤法在4小时、24小时、1周、2周、4周、8周和12周时评估封闭情况。分别通过维卡针、操作手感问卷和万能材料试验机研究试验组的初凝时间、操作性能和抗压强度。
两组在4小时和24小时时微渗漏存在显著差异（P<0.05），而在1周、2周、4周、8周和12周时无差异。MTA-安杰卢斯和生物陶瓷的凝固时间无显著差异，不过发现后者具有更好的操作一致性。生物陶瓷的抗压强度显著高于MTA-安杰卢斯。
结果表明，新型钙硅基牙髓水门汀在密封能力以及牙科充填材料的临床可操作性方面有所改善。
