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Paper Information

Journal:   IRANIAN ENDODONTIC JOURNAL (IEJ)   2013 , Volume 8 , Number 4; Page(s) 157 To 159.
 
Paper: 

EFFECT OF SMEAR LAYER ON THE PUSH-OUT BOND STRENGTH OF TWO DIFFERENT COMPOSITIONS OF WHITE MINERAL TRIOXIDE AGGREGATE

 
 
Author(s):  LOTFI MEHRDAD, RAHIMI SAEED, GHASEMI NEGIN*, VOSOUGH HOSSEINI SEPIDEH, BAHARI MAHMOOD, SAGHIRI MOHAMMAD ALI, SHAHIDI ATABAK
 
* DEPARTMENT OF ENDODONTICS, DENTAL SCHOOL OF TABRIZ UNIVERSITY OF MEDICAL SCIENCES, DANESHGAH AVE., TABRIZ, IRAN
 
Abstract: 

Introduction: The aim of this in vitro study was to evaluate the effect of smear layer on the push-out bond strength of white mineral trioxide aggregate (WMTA) with and without disodium hydrogen phosphate (Na2HPO4).
Materials and Methods: Dentin discs with standard cavities were obtained from extracted human single-rooted teeth and divided to 4 groups (n=15) according to the irrigation regimen and the canal filling material. In groups 1 and 3, canals were irrigated with normal saline; in groups 2 and 4, irrigation method included sodium hypochlorite (NaOCl) and then ethylenediaminetetra-acetic acid (EDTA). The canals were filled with WMTA in first and second groups and with WMTA+Na2HPO4; in groups 3 and 4. The samples were wrapped in wet gauze and incubated in 37oC for 3 days. The push-out bond strength was then measured by means of the Universal Testing Machine and the failure modes were examined under stereomicroscope at 40× magnification. Tow-way ANOVA was used to evaluate the effect of material type and smear layer removal. Post hoc Tukey test was used for the two-by-two comparison of the groups.
Results: The greatest and lowest mean±standard deviation for pushout bond strength were observed in groups 4 (4.54±1.14 MPa) and 1 (1.44±0.96 MPa), respectively. The effect of removing the smear layer on the push-out bond strength of WMTA+Na2HPO4 was significant (P=0.01), but not for WMTA (P=0.52). Interestingly, there was significant difference between groups 1, 3 and 2, 4 (P<0.05). The failure mode for all experimental groups was of mixed type.
Conclusion: Under circumstances of this in vitro study, removal of smear layer increases push-out bond strength when Na2HPO4 is added to WMTA.

 
Keyword(s): DISODIUM HYDROGEN PHOSPHATE, MINERAL TRIOXIDE AGGREGATE, PUSH-OUT BOND STRENGTH, SMEAR LAYER, ROOT CANAL PREPARATION
 
 
References: 
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Citations: 
 
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APA: Copy

LOTFI, M., & RAHIMI, S., & GHASEMI, N., & VOSOUGH HOSSEINI, S., & BAHARI, M., & SAGHIRI, M., & SHAHIDI, A. (2013). EFFECT OF SMEAR LAYER ON THE PUSH-OUT BOND STRENGTH OF TWO DIFFERENT COMPOSITIONS OF WHITE MINERAL TRIOXIDE AGGREGATE. IRANIAN ENDODONTIC JOURNAL (IEJ), 8(4), 157-159. https://www.sid.ir/en/journal/ViewPaper.aspx?id=410138



Vancouver: Copy

LOTFI MEHRDAD, RAHIMI SAEED, GHASEMI NEGIN, VOSOUGH HOSSEINI SEPIDEH, BAHARI MAHMOOD, SAGHIRI MOHAMMAD ALI, SHAHIDI ATABAK. EFFECT OF SMEAR LAYER ON THE PUSH-OUT BOND STRENGTH OF TWO DIFFERENT COMPOSITIONS OF WHITE MINERAL TRIOXIDE AGGREGATE. IRANIAN ENDODONTIC JOURNAL (IEJ). 2013 [cited 2021November27];8(4):157-159. Available from: https://www.sid.ir/en/journal/ViewPaper.aspx?id=410138



IEEE: Copy

LOTFI, M., RAHIMI, S., GHASEMI, N., VOSOUGH HOSSEINI, S., BAHARI, M., SAGHIRI, M., SHAHIDI, A., 2013. EFFECT OF SMEAR LAYER ON THE PUSH-OUT BOND STRENGTH OF TWO DIFFERENT COMPOSITIONS OF WHITE MINERAL TRIOXIDE AGGREGATE. IRANIAN ENDODONTIC JOURNAL (IEJ), [online] 8(4), pp.157-159. Available: https://www.sid.ir/en/journal/ViewPaper.aspx?id=410138.



 
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