A Comparative SEM Investigation of Smear Layer Remaining on Dentinal Walls by Three Rotary NiTi Files with Different Cross Sectional Designs in Moderately Curved Canals
Objective: The objective of this study was to compare the smear layer formed on root canal walls during canal preparation of extracted human teeth by Twisted, Mtwo, and ProTaper rotary nickel titanium instruments. Materials and Methods: Sixty single rooted human premolar teeth with root curvatu...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
JCDR Research and Publications Private Limited
2015-03-01
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| Series: | Journal of Clinical and Diagnostic Research |
| Subjects: | |
| Online Access: | https://jcdr.net/articles/PDF/5710/11569_CE(Ra1)_F(GH)_PF1(PAK)_PFA(AK)_PF2(PAG).pdf |
| Summary: | Objective: The objective of this study was to compare the smear
layer formed on root canal walls during canal preparation of
extracted human teeth by Twisted, Mtwo, and ProTaper rotary
nickel titanium instruments.
Materials and Methods: Sixty single rooted human premolar teeth
with root curvature <250
were selected and randomly divided into
three Groups (n= 20 teeth per Group). Three types of rotary nickel
titanium instruments were used, Twisted (SybronEndo, Orange,
CA, USA), Mtwo (VDW, Munich, Germany) and ProTaper (Dentsply
Maillefer, Ballaigues, Switzerland) according to manufacturer’s
instructions to instrument the root canals. Irrigation for all groups
was performed after each instrument change with 3ml of 3%
sodium hypochlorite followed by Glyde (File Prep, Dentsply,
Maillefer, Ballaigues, Switzerland) as chelator paste and lubricant.
Three different areas (coronal, middle and apical thirds) of the root
canal were evaluated using scanning electron microscopy (SEM).
The canal wall of each sample was assessed and compared using
a predefined scale for the presence or absence of smear layer. Data
were analysed statistically using ANOVA and Tukey HSD test
Results: All three groups showed statistically significant more
smear layer in the apical thirds of the canal as compared to the
coronal and middle thirds (p<0.001). Mtwo rotary file system
produced significantly less smear layer (p<0.001) compared to
Twisted and ProTaper rotary instruments in the apical portion.
Twisted Files resulted in less smear layer formation in the apical
thirds of the canal compared to ProTaper rotary instruments but
were statistically insignificant.
Conclusion: Completely clean root canals were not found after
instrumentation with any of the three instruments. Under the
confines of this study Mtwo instruments produced significantly
cleaner dentin wall surfaces throughout the canal length in
comparison to Twisted and ProTaper rotary files. Twisted Files
proved to be comparable to ProTaper rotary instruments with
respect to canal cleanliness in the apical thirds of the root canal. |
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| ISSN: | 2249-782X 0973-709X |