Push-out bond strength and intratubular biomineralization of a hydraulic root-end filling material premixed with dimethyl sulfoxide as a vehicle

Ju-Ha Park; Hee-Jin Kim; Kwang-Won Lee; Mi-Kyung Yu; Kyung-San Min

doi:10.5395/rde.2023.48.e8

Push-out bond strength and intratubular biomineralization of a hydraulic root-end filling material premixed with dimethyl sulfoxide as a vehicle

Restor Dent Endod. 2023 Jan 20;48(1):e8. doi: 10.5395/rde.2023.48.e8. eCollection 2023 Feb.

Authors

Ju-Ha Park¹, Hee-Jin Kim², Kwang-Won Lee^{1

3

4}, Mi-Kyung Yu^{1

3

4}, Kyung-San Min^{1

3

4}

Affiliations

¹ Department of Conservative Dentistry, School of Dentistry, Jeonbuk National University, Jeonju, Korea.
² Department of Dentistry, College of Medicine, Kosin University, Busan, Korea.
³ Research Institute of Clinical Medicine of Jeonbuk National University, Jeonju, Korea.
⁴ Biomedical Research Institute of Jeonbuk National University Hospital, Jeonju, Korea.

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.

Keywords: Bioceramic; Biomineralization; Premixed; Push-out; Vehicle.