| Summary: | Root canal cleanliness is one of root canal preparation�s goal. Nickel
Titanium rotary instrument is beginning to be used widely due to its ability in
achieving root canal clenliness better than that of stainless steel manual. The aim of
this study was to find out any differences on cleanliness level at coronal third,
middle third, and apical third of root canal prepared using nikel titanium (NiTi)
rotary instrument Mtwo single length, ProTaper crown down, and ProTaper hybrid.
The subjects of the study were twelve post extracted maxillary and
mandibular premolars which were cut to leave twelve millimeters long roots and
then divided into three groups which consisted of premolars prepared using Mtwo
single length (group one), ProTaper crown down (group two), and ProTaper
hybrid. All subjects were subsequently sectioned longitudinally to be coated with
gold. Root canal cleanliness level were observed using Scanning Electron
Microscope (SEM) with 2000 times magnification at three fields of view which
were coronal third, middle third, and apical third. Micrograph results were given
score which ranged from 1 to 4 based on dentinal tubules uncovered by material
resulted from preparation.
Kruskal-Wallis test results showed significant differences on cleanliness
level between three root canal segments after root canal preparation using MTwo
single length rotary, ProTaper crown down, and Protaper hybrid (p<0,05). U Mann-
Whitney test between segments in each group indicated that coronal third and
middle third had the best cleanliness level and apical third had the poorest
cleanliness level, there is no significant difference on cleanliness level between
Mtwo single length, ProTaper crown down, and ProTaper hybrid at coronal third
and apical third (p>0,05), and middle third segment prepared using ProTaper
hybrid had significantly the best root canal cleanliness level compared to those
prepared using Mtwo single length and ProTaper crown down. This study
concludes that all instruments produce good cleanliness level at coronal and middle
third, but can�t produce good cleanliness level at apical third and the best
cleanliness level happens at midlle third by ProTaper hybrid.
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