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Paper Information

Journal:   IRANIAN ENDODONTIC JOURNAL (IEJ)   2014 , Volume 9 , Number 4; Page(s) 266 To 270.
 
Paper: 

EFFECT OF ACIDIC ENVIRONMENT ON THE PUSH-OUT BOND STRENGTH OF CALCIUM-ENRICHED MIXTURE CEMENT

 
 
Author(s):  SOBHNAMAYAN FERESHTEH*, SAHEBI SAFOORA, NADERI MISAGH, SHOJAEE NOOSHIN SADAT, SHANBEZADEH NAJMEH
 
* DEPARTMENT OF ENDODONTICS, DENTAL SCHOOL, SHIRAZ UNIVERSITY OF MEDICAL SCIENCES, SHIRAZ, IRAN
 
Abstract: 

Introduction: This laboratory study was performed to evaluate the effect of different acidic pH values on the push-out bond strength of calcium-enriched mixture (CEM) cement. Methods and Materials: Forty-eight root dentin slices were obtained from freshly extracted single rooted human teeth and their lumen were instrumented to achieve a diameter of 1.3 mm. Then, CEM cement was mixed according to manufacturers’ instruction and placed in the lumens with minimal pressure. The specimens were randomly divided into four groups (n=12) which were wrapped in pieces of gauze soaked in either synthetic tissue fluid (STF) (pH=7.4) or butyric acid which was buffered at pH values of 4.4, 5.4 and 6.4. They were then incubated for 4 days at 37°C. The push-out test was performed by means of the universal testing machine. Specimens were then examined under a digital light microscope at 20´ magnification to determine the nature of the bond failure. The data were analyzed using the Kruskal-Wallis test followed by Dunn’s test for pairwise comparisons. Results: The highest push-out bond strength (10.19±4.39) was seen in the pH level of 6.4, which was significantly different from the other groups (P<0.05). The values decreased to 2.42±2.25 MPa after exposure to pH value of 4.4. Conclusion: Lower pH value of highly acidic environments (pH=4.4), adversely affects the force needed for displacement of CEM cement; while in higher pH values (pH=6.4) the bond-strength was not affected. CEM cement is recommended in clinical situations where exposure to acidic environment is unavoidable.

 
Keyword(s): ACIDIC ENVIRONMENT, CALCIUM-ENRICHED MIXTURE, CEM CEMENT, PUSH-OUT BOND STRENGTH, ROOT-END FILLING
 
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