Caronna Victor, Himel Van, Yu Qingzhao, Zhang Jian-Feng, Sabey Kent
Department of Endodontics, LSU Health Sciences Center, School of Dentistry, New Orleans, Louisiana.
Biostatistics Program, LSU School of Public Health, New Orleans, Louisiana.
J Endod. 2014 Jul;40(7):986-9. doi: 10.1016/j.joen.2013.12.005. Epub 2014 Jan 17.
Procedures used in single-visit or multiple-visit approaches to apical barrier creation were used with an experimental apexification model to test the surface hardness of 3 materials. The purpose of this study was to examine the microhardness of the materials after setting in moist or dry conditions.
A simulated open apex and periapical environment model was created using polyethylene tubes placed into a porous block filled with phosphate-buffered saline. White ProRoot Mineral Trioxide Aggregate (MTA; Dentsply Tulsa Dental, Tulsa, OK), EndoSequence Root Repair Material (ESRRM; Brasseler USA, Savannah, GA), and Biodentine (BD; Septodont, Louisville, CO) were mixed and placed into the apical 4 mm of the tubes (N = 15). The moist group had a damp cotton pellet above the test materials (mineral trioxide aggregate or ESSRM) with Fuji II LC (GC America, Alsip, IL) sealing the coronal segment. The dry group had gutta-percha placed directly against the test materials with amalgam sealing the coronal segment. After 10 days of storage in 100% humidity at 37°C, samples were sectioned, and microhardness was independently measured at 2 mm and 4 mm from the apical end. Differences were assessed using analysis of variance and a Tukey post hoc test (α = .05).
Analysis of variance analyses showed no significant effect of wet or dry conditions on resultant material hardness. A Tukey post hoc test showed that using ESRRM and BD would not result in a significant difference in hardness, but using MTA would result in statistically significant different hardness values when compared with ESRRM or BD.
Either a moist or dry environment could allow hardening of materials; thus, both methods could be acceptable for clinical treatment procedures.
在根尖屏障形成的单次就诊或多次就诊方法中使用的程序与实验性根尖诱导成形模型一起用于测试3种材料的表面硬度。本研究的目的是检查材料在潮湿或干燥条件下凝固后的显微硬度。
使用放置在填充有磷酸盐缓冲盐水的多孔块中的聚乙烯管创建模拟的开放根尖和根尖周环境模型。将白色ProRoot矿物三氧化物凝聚体（MTA；登士柏 Tulsa Dental，塔尔萨，俄克拉荷马州）、EndoSequence根管修复材料（ESRRM；美国Brasseler公司，萨凡纳，佐治亚州）和生物陶瓷（BD；Septodont公司，路易斯维尔，科罗拉多州）混合并放置在管的根尖4mm处（N = 15）。潮湿组在测试材料（矿物三氧化物凝聚体或ESRRM）上方有一个潮湿的棉球，用富士II LC（GC America公司，阿尔西普，伊利诺伊州）密封冠部。干燥组将牙胶直接放置在测试材料上，用汞合金密封冠部。在37°C的100%湿度下储存10天后，将样本切片，并在距根尖末端2mm和4mm处独立测量显微硬度。使用方差分析和Tukey事后检验（α = .05）评估差异。
方差分析表明，潮湿或干燥条件对所得材料硬度没有显著影响。Tukey事后检验表明，使用ESRRM和BD不会导致硬度有显著差异，但与ESRRM或BD相比，使用MTA会导致统计学上显著不同的硬度值。
潮湿或干燥环境均可使材料硬化；因此，这两种方法在临床治疗程序中都可能是可接受的。
