Steam sterilization effect on the accuracy of friction-style mechanical torque limiting devices.
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Date
2014-05
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Abstract
Aim: This study was aimed to evaluate the effect of steam sterilization on the accuracy (within
10%) of friction‑style mechanical torque limiting devices (F‑S MTLDs) to achieve their target
torque values.
Materials and Methods: Fifteen new F‑S MTLDs were selected from Astra Tech (25 Ncm,
Hader SA, La Chaux‑de‑Fonds, Switzerland), BioHorizons (30 Ncm, Dynatorq ITL, Irvine,
California, USA), Dr. Idhe (15‑60 Ncm, Dr. Idhe Dental, Eching/Munich, Germany). Every
peak torque measurement was tested ten times before steam sterilization using Tohnichi
torque gauge (6Tohnichi‑BTG (‑S), Japan). Steam sterilization was performed using a 100 cycle
autoclave. Preparation steps were carried out for the devices before each autoclave sterilization
cycle. Peak torque measurements were repeated after every sterilization cycle. Mean difference
between the measured and the targeted torque values were evaluated before and after aging.
Repeated‑measures of ANOVA were used to compare the differences of accuracy between
subjects. Bonferroni post‑hoc test was used for pairwise comparison.
Results: Autoclaving resulted in an increase in the error values (the difference between peak
torque and target torque values) in all the three groups studied (P < 0.05), with only Astra
Tech devices showing >10% (maximum 12%) difference from their torque values in 5% of the
measurements.
Conclusion: Steam sterilization effect differs between target torque and measured peak values
with an increase trend. The peak torque values showed a significant decrease for BioHorizons,
while a significant increase was noted for Astra Tech and no significant change in Dr. Idhe
group after sterilization.
Clinical Implication: Within the limitation of this study the torque output of each individual
device deviated in varying degrees from target torque values. However, the majority of the new
frictional‑style devices tested in this study, delivered fairly consistent torque output within 10%
of their preset target values after sterilization. Astra Tech devices were the only one showing
more than 10% difference from their torque values in 5% of the measurements. Combined
effects of sterilization and aging still needs to be determined.
Description
Keywords
Dentistry, friction, implant, sterilization, torque
Citation
Sadr Seyed Jalil, Fayyaz Ali, Mahshid Minoo, Saboury Aboulfazl, Ansari Ghassem. Steam sterilization effect on the accuracy of friction-style mechanical torque limiting devices. Indian Journal of Dental Research. 2014 May-Jun; 25(3): 352-356.