Push-out bond strength and intratubular biomineralization of a hydraulic root-end filling material premixed with dimethyl sulfoxide as a vehicle
박주하, 김희진, 이광원, 유미경, 민경산,
소속 상세정보
박주하 ( Park Ju-Ha ) -
김희진 ( Kim Hee-Jin ) - Kosin University College of Medicine Department of Dentistry
이광원 ( Lee Kwang-Won ) - Chonbuk National University School of Dentistry Department of Conservative Dentistry
유미경 ( Yu Mi-Kyung ) - Chonbuk National University School of Dentistry Department of Conservative Dentistry
민경산 ( Min Kyung-San ) - Chonbuk National University School of Dentistry Department of Conservative Dentistry
Abstract
Objectives: 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).
Materials and Methods: The root canal of a single-rooted premolar was filled with either ProRoot MTA or Endocem MTA Premixed (n = 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 t-test followed by the Mann-Whitney U test (p < 0.05).
Results: 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.
Conclusions: Regarding bonding to root dentin, Endocem MTA Premixed may have potential for use as an acceptable root-end filling material.
키워드
Bioceramic; Push-out; Biomineralization; Vehicle; Premixed
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