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The effect of human blood on the setting and surface micro-hardness of calcium silicate cements

 Minju Song  ;  Wonyoung Yue  ;  Soyeon Kim  ;  Wooksung Kim  ;  Yaelim Kim  ;  Jeong-Woong Kim  ;  Euiseong Kim 
 CLINICAL ORAL INVESTIGATIONS, Vol.20(8) : 1997-2005, 2016 
Journal Title
Issue Date
Aluminum Compounds ; Blood* ; Calcium Compounds ; Drug Combinations ; Hardness Tests ; Humans ; Microscopy, Electron, Scanning ; Oxides ; Root Canal Filling Materials/chemistry* ; Silicate Cement/chemistry* ; Silicates ; Sodium Chloride ; Surface Properties ; X-Ray Diffraction
Calcium silicate cements ; Human blood ; Micro-hardness ; Mineral trioxide aggregate ; RetroMTA
OBJECTIVES: The purpose of the present study was to evaluate the effects of human blood on the setting and microhardness of calcium silicate cements.

MATERIALS AND METHODS: Three types of silicate-based cements were used: ProRoot MTA (PMTA), OrthoMTA (OMTA), and RetroMTA (RMTA). Mixed cement was placed into polyethylene molds with lengths of 2 and 4 mm. After storage for 4 days under three different storage conditions, i.e., saline, saline after 5 min of human blood, and human blood, the polyethylene molds were removed. With the specimens set, the surface microhardness was measured using a Vickers microhardness tester, crystalline structure was analyzed with X-ray diffraction (XRD), and the surface characteristics were examined with scanning electron microscopy (SEM).

RESULTS: All specimens of 4 mm in length were set with all materials, and the blood groups exhibited lower microhardnesses than did the saline groups (p < 0.05). Among the 2-mm specimens that were stored in blood, the numbers of specimens that set were significantly different across the materials (p < 0.001). Regarding the microhardnesses of the RMTA and OMTA groups, there were no significant differences between storage conditions. For the PMTA group, only one specimen that was set in the blood group exhibited reduced microhardness. XRD showed changes of crystalline structure in the PMTA and OMTA blood group, whereas RMTA did not. SEM analysis revealed more rounded and homogeneous structures and demonstrated a clear lack of acicular or needle-like crystals in the PMTA and OMTA blood groups, while RMTA did not reveal substantial differences between the saline- and blood-stored groups.

CONCLUSION: Blood contamination detrimentally affected the surface microhardnesses of all materials; furthermore, among the 2-mm specimens, blood contamination interfered with normal setting. Therefore, RMTA might be a more suitable choice when blood contamination is unavoidable due to limited depth. Clinical relevance RetroMTA might be a more suitable choice in situations in which blood contamination is unavoidable.
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2. College of Dentistry (치과대학) > Dept. of Conservative Dentistry (보존과학교실) > 1. Journal Papers
Yonsei Authors
Kim, Eui Seong(김의성) ORCID logo https://orcid.org/0000-0003-2126-4761
Yue, Won Young(유원영)
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