Restor Dent Endod.  2013 Aug;38(3):128-133.

Evaluation of the effect of blood contamination on the compressive strength of MTA modified with hydration accelerators

• Oloomi K
• Saberi E
• Mokhtari H
• Mokhtari Zonouzi HR
• Nosrat A
• Nekoofar M
• Dummer PM

Abstract

OBJECTIVES
This study was performed to evaluate the effect of blood contamination on the compressive strength (CS) of Root MTA (RMTA) modified with Calcium chloride (CaCl2) and Disodium hydrogen phosphate (Na2HPO4) as setting accelerators over time.
MATERIALS AND METHODS
A total of 110 cylindrical specimens of RMTA were divided into 6 experimental groups as follows: Group1, RMTA; Group 2, RMTA modified with CaCl2 (RMTA-C); Group 3, RMTA modified with Na2HPO4 (RMTA-N); Group 4, RMTA contaminated with blood; Group 5, RMTA-C contaminated with blood; Group 6, RMTA-N contaminated with blood. The CS of specimens in all groups was evaluated after 3 hr, 24 hr, and 1 wk. In the modified groups (groups 2, 3, 5, and 6) the CS of five specimens per group was also evaluated after 1 hr.
RESULTS
Blood contamination significantly reduced the CS of all materials at all time intervals (p < 0.05). After 3 hr, the CS of specimens in the RMTA groups (with and without blood contamination) was significantly lower than those in the RMTA-C and RMTA-N groups (p < 0.05). The CS values were not significantly different at the other time intervals. In all groups, the CS of specimens significantly increased over time (p < 0.05).
CONCLUSIONS
Blood contamination decreased the CS of both original and accelerated RMTA.

Keyword

Blood contamination; Calcium chloride; Compressive strength; Disodium hydrogen phosphate; Mineral trioxide aggregate

MeSH Terms

Aluminum Compounds
Calcium Chloride
Calcium Compounds
Compressive Strength
Drug Combinations
Glutamates
Guanine
Hydrogen
Oxides
Silicates
Pemetrexed
Aluminum Compounds
Calcium Chloride
Calcium Compounds
Drug Combinations
Glutamates
Guanine
Hydrogen
Oxides
Silicates

Figure

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  Figure 1 Similar trends have been observed in both blood contaminated (dash lines) and uncontaminated (solid lines) groups but the former showed significantly lower compressive strengths in all time intervals. RMTA, Root MTA; RMTA-C, RMTA modified with CaCl2; RMTA-N, RMTA modified with Na2HPO4; NC, No contamination; BC, Blood contamination.

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  Figure 2 Mean Compressive strengths of uncontaminated and blood contaminated materials in each time interval. RMTA, Root MTA; RMTA-C, RMTA modified with CaCl2; RMTA-N, RMTA modified with Na2HPO4; NC, No contamination; BC, Blood contamination. *1 & *2, statistically significant; +1 & +2, statistically not significant.

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