Cavity Preparations | University of Toronto Faculty of ...
Cutting Instruments.ne bur type (No. 557 crosscut fissure bur) and one air turbine (Borden) were utilized throughout this study. The driving air supply to the handpiece was maintained at 25 pounds per square inch (p.s.i.). A new bur (of the same manufacturer) was used following each three test cuts, i.e., after each 45 seconds of cutting.
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