Effect of modified Hedstrom files on instrumentation area produced by ProFile instruments in oval canals.
OBJECTIVE
To study the effect of a modified Hedstrom file called IqFile on the instrumentation shape of oval canals prepared with ProFile instruments.


METHODS
Fifty extracted premolars were divided into 3 groups of 16 teeth each. Group 1 was subjected to ProFile 0.04 rotary instrumentation to a size 6. Group 2 followed the same technique, but also received buccolingual hand instrumentation with IqFiles to ISO size 70. Group 3 was instrumented similarly to group 2 but unmodified Hedstrom files were used. Teeth were sectioned at 1 and 3 mm from working length and photographed at 26x magnification. AutoCAD was used for measuring the percentage of instrumented area of the canal.


RESULTS
ANOVA revealed that Group 2 was significantly better than Groups 1 (P=.00) and 3 (P=.00) at the 1 mm level. At the 3 mm level Group 2 was significantly better than Group 1 (P=.03), but no differences were found between Groups 2 and 3 (P=.15).


CONCLUSIONS
The combination of ProFile and IqFile was found more effective in instrumenting oval canals at both the 1 and the 3 mm levels. However, at the 3 mm level no difference was detected between the use of IqFiles and the use of unmodified Hedstrom files.
Department of Endodontics, The Robert Schattner Center, University of Pennsylvania, School of Dental Medicine, Philiadelphia 19104-6030, USA. miqbal@pobox.upenn.edu
Mian Khalid
MK
Iqbal
Bekir
B
Karabucak
Michael
M
Brown
Erick
E
Menegazzo
D001641:Bicuspid; D003762:Dental Instruments; D003786:Dental Pulp Cavity / Q000033:anatomy & histology*; D004867:Equipment Design; D006801:Humans; D018915:Root Canal Preparation / Q000295:instrumentation* / Q000379:methods