When using a high-speed handpiece for cavity preparation, the heat generated is directly related to the
1. duration of cutting.
2. size, speed and sharpness of the bur.
3. use of air and water spray.
4. effectiveness of the suction
(1) (2) (3)
(1) and (3)
(2) and (4)
(4) only
All of the above.
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