Abstract
Statement of problem
Evaluation of the cutting efficiency and effectiveness, surface roughness, and cleanability
of a novel rotary instrument is lacking.
Purpose
The purpose of this in vitro study was to compare the cutting efficiency and effectiveness
of a recently introduced diamond rotary instrument containing corundum microspheres
with conventional instruments by evaluating the heat generated, surface roughness,
and cleanability of each instrument after tooth preparations.
Material and methods
Sound molars (n=225) were used to evaluate cutting efficiency and effectiveness by
measuring the heat generated by 3 diamond dental rotary instruments: test instrument
(TI), reference instrument (RI), and NTI instrument (NI). Thirty cavity preparations
(27 mm3) were prepared, and the thermal change (ΔT) was determined from a thermocouple inserted
in the pulp chamber. The surface roughness of the dentin substrate was determined
after veneer preparations using scanning white-light interferometry and scanning electron
microscope imaging. The cleanability of TI and RI was also determined by comparing
the efficacy of 3 conventional disinfection protocols after contaminating the instrument
with Gram-positive or Gram-negative oral pathogens. The mean and standard deviation
values for thermal change, surface roughness, and colony forming units were calculated
at a 95% confidence level, and 1-way ANOVA was used to determine statistical significance
(α=.05).
Results
The NI instrument had the lowest mean ΔT (1.47 °C). The TI (1.77 °C) and RI (1.85
°C) groups showed statistically similar means (P>.05). The TI presented the lowest surface roughness (1.68 μm), followed by the RI
(1.87 μm) (P<.001). The NI resulted in the highest surface roughness (2.17 μm) (P<.001). The disinfection protocols used were more effective on the TI group than on
the RI group regardless of organisms and time exposed to the cleaning solution (P<.001).
Conclusions
The novel diamond instrument demonstrated similar cutting efficiency and effectiveness
when compared with conventional diamond instruments. However, the novel instrument
produced smoother tooth preparations and was easier to clean than the conventional
diamond rotary instruments.
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Article info
Publication history
Published online: December 14, 2022
Publication stage
In Press Corrected ProofFootnotes
Funding: Supported by a grant from Komet Dental, grant #511767.
Identification
Copyright
© 2022 by the Editorial Council for the Journal of Prosthetic Dentistry.
