Park Ju-Ha, Kim Hee-Jin, Lee Kwang-Won, Yu Mi-Kyung, Min Kyung-San
Department of Conservative Dentistry, School of Dentistry, Jeonbuk National University, Jeonju, Korea.
Department of Dentistry, College of Medicine, Kosin University, Busan, Korea.
Restor Dent Endod. 2023 Jan 20;48(1):e8. doi: 10.5395/rde.2023.48.e8. eCollection 2023 Feb.
This study was designed to evaluate the parameters of bonding performance to root dentin, including push-out bond strength and dentinal tubular biomineralization, of a hydraulic bioceramic root-end filling material premixed with dimethyl sulfoxide (Endocem MTA Premixed) in comparison to a conventional powder-liquid-type cement (ProRoot MTA).
The root canal of a single-rooted premolar was filled with either ProRoot MTA or Endocem MTA Premixed ( = 15). A slice of dentin was obtained from each root. Using the sliced specimen, the push-out bond strength was measured, and the failure pattern was observed under a stereomicroscope. The apical segment was divided into halves; the split surface was observed under a scanning electron microscope, and intratubular biomineralization was examined by observing the precipitates formed in the dentinal tubule. Then, the chemical characteristics of the precipitates were evaluated with energy-dispersive X-ray spectroscopic (EDS) analysis. The data were analyzed using the Student's -test followed by the Mann-Whitney test ( < 0.05).
No significant difference was found between the 2 tested groups in push-out bond strength, and cohesive failure was the predominant failure type. In both groups, flake-shaped precipitates were observed along dentinal tubules. The EDS analysis indicated that the mass percentage of calcium and phosphorus in the precipitate was similar to that found in hydroxyapatite.
Regarding bonding to root dentin, Endocem MTA Premixed may have potential for use as an acceptable root-end filling material.
本研究旨在评估与传统的粉液型水门汀（ProRoot MTA）相比，预混有二甲基亚砜的水硬性生物陶瓷根充材料（Endocem MTA预混剂）与牙根牙本质的粘结性能参数，包括推出粘结强度和牙本质小管生物矿化。
单根前磨牙的根管分别用ProRoot MTA或Endocem MTA预混剂充填（每组n = 15）。从每个牙根获取一片牙本质。使用切片标本测量推出粘结强度，并在体视显微镜下观察失败模式。根尖段分成两半；劈开面在扫描电子显微镜下观察，通过观察牙本质小管中形成的沉淀物来检查管内生物矿化。然后，用能量色散X射线光谱（EDS）分析评估沉淀物的化学特性。数据采用Student's t检验，随后进行Mann-Whitney U检验（P < 0.05）进行分析。
在推出粘结强度方面，两个测试组之间未发现显著差异，粘结性失败是主要的失败类型。在两组中，均沿牙本质小管观察到片状沉淀物。EDS分析表明，沉淀物中钙和磷的质量百分比与羟基磷灰石中的相似。
关于与牙根牙本质的粘结，Endocem MTA预混剂可能有潜力作为一种可接受的根充材料使用。
