“…Regarding the characteristics of diamond burs, cutting efficiency is one of the most important aspects to consider when selecting a diamond bur. In dentistry, the cutting efficiency of diamond burs is generally affected by several factors, including the grit size [ 20 , 26 , 27 ], the coolant flow [ 28 , 29 ], the load applied by the operator, the design, the tooth structure [ 20 , 26 ], the repeated use [ 26 , 27 ], the cleaning, and the sterilization [ 26 , 30 , 31 ], the use of the electric micromotor vs air turbine handpieces and the cutting technique [ 4 , 29 ], the number and location of the dental handpieces coolant ports [ 4 , 29 ]. Many studies have stated that the cutting efficiency decreases as the number of cuts increases, regardless of the type of burs, and the reduction is the highest after the first use [ 23 , 26 , 30 , 31 ].…”