Wear of Rotary Instruments: A Pilot Study
- Author:
A. Abdul Aziz
;
N.H. Abu Kasim
;
C. Ramasindarum
;
M.Y.P. Mohamad Yusof
;
M. Paiizi
;
R. Ahmad
- Publication Type:Journal Article
- Keywords:
tungsten carbide burs;
diamond rotary instrument;
wear;
rake angle
- From:
Annals of Dentistry
2011;18(1):1-7
- CountryMalaysia
- Language:English
-
Abstract:
The aim of this study was to assess the wear of tungsten
carbide burs and round rotary diamond instruments
through measurements of rake angle and visual
observations respectively under a f ield emission
scanning electron microscope. Sixty short and long
head pear-shaped tungsten carbide burs and 18 round
rotary diamond instruments that had been used to
complete < 5, > 5 and > 10 cavity preparations (n=10/
group) were selected from the 3rd and 4th year dental
students, Faculty of Dentistry, University of Malaya.
There were two control groups consisting of long and
short tungsten carbide burs of ten each. Two-way
ANOVA was used to analyse the rake angle data. The
data from the two control groups were collectively
analysed following multiple paired t-test (p > .05)
which showed no significant difference between the
two types of tungsten carbide bur (short and long
head). The mean rake angle of the control group was
significantly higher (p < .05) compared to the < 5, > 5
and > 10 cavity preparation groups. The rake angle of
the > 10 cavity preparation group was significantly
lower than the other two test groups (p < .05). Round
rotary diamond instruments in the < 5 cavity
preparation group showed intact diamond particles
with distinct cutting facets comparable to the control
group. However, diamonds instruments in the > 5 and
> 10 cavity preparation groups showed blunt diamond
particles. In conclusion, wear of tungsten carbide burs
and round rotary diamond instruments were evident
after repeated use. Wear was more pronounced when
instruments were used to prepare more than ten
cavities.
- Full text:W020150904553301681706.pdf
