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Open Access Research article

Physical properties and biological/odontogenic effects of an experimentally developed fast-setting α-tricalcium phosphate-based pulp capping material

Jun-Bong Lee1, Su-Jung Park3, Hyun-Ha Kim3, Young-Sun Kwon1, Kwang-Won Lee1 and Kyung-San Min12*

Author Affiliations

1 Department of Conservative Dentistry, School of Dentistry and Institute of Oral Bioscience, Chonbuk National University, 567 Baekje-daero, Jeonju, Korea

2 Research Institute of Clinical Medicine of Chonbuk National University-Biomedical Research Institute of Chonbuk National University Hospital, 20 Geonji-ro, Jeonju, Korea

3 Department of Conservative Dentistry, School of Dentistry, Wonkwang University, 460 Iksan-daero, Iksan, Korea

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BMC Oral Health 2014, 14:87  doi:10.1186/1472-6831-14-87

Published: 11 July 2014

Abstract

Background

Recently, fast-setting α-tricalcium-phosphate (TCP) cement was developed for use in the pulp capping process. The aim of this study was to investigate the physical properties and biological effects of α-TCP cement in comparison with mineral trioxide aggregate (MTA).

Methods

We measured the setting time, pH values, compressive strength, and solubility of the two materials. We evaluated biocompatibility on the basis of cell morphology and a viability test using human dental pulp cells (hDPCs). Chemical composition of each material was analyzed by energy dispersive x-ray spectroscopic (EDS) analysis. The expression of odontogenic-related genes was evaluated by Western blotting and immunofluorescence. The calcified nodule formation was measured by Alizarin red staining. We performed the pulp capping procedure on rat teeth for histological investigation. The data were analyzed by an independent t-test for physical properties, one-way ANOVA for biological effects, and the Mann-Whitney U test for tertiary dentin formation. A P value of less than 0.05 was considered statistically significant for all tests.

Results

The setting time, pH values, and compressive strength of α-TCP was lower than that of MTA (P < 0.05); however, the solubility of α-TCP was higher than that of MTA (P < 0.05). The resultant cell viability observed with the two materials was similar (P > 0.05). Scanning electron microscopy (SEM) revealed that cells attached to both materials were flat and had cytoplasmic extensions. The expression of odontogenic-related markers and mineralized nodule formation were higher in the two experimental groups compared to the control group (P < 0.05). Continuous tertiary dentin was formed underneath the capping materials in all samples of the tested groups.

Conclusions

Our study demonstrated that the α-TCP exhibited biocompatibility and odontogenicity comparable to MTA, whereas it had a quicker setting time.

Keywords:
Calcium phosphate; Fast-setting; Mineral trioxide aggregate; Odontogenic; Pulp capping; Tertiary dentin