Table 3 Summary of effects of burr speed, torque, and coarseness.

Coarse burr	Removes larger particles of nail, resulting in greatly reduced exposure to finer dust respirable particles
Removing larger particles	Efficiency is increased
Slower speed with increased torque	Less velocity behind the throw of the particles, allows dust extraction to be more efficient/effective, reducing risk of “flying particles”
Reducing burr speed, allowing grit to take maximum effect	Reduction in heat generated at the site of application, better and safer for the clients