What generates considerable heat during tooth preparation?

The generation of considerable heat during tooth preparation is primarily due to the friction between the tooth surface and the rotary instrument. When a dental bur or similar rotary instrument makes contact with the tooth enameled dentin, the mechanical action involved in cutting or grinding generates heat. This frictional heat can raise the temperature of both the instrument and the tooth structure.

Maintaining a proper technique and using appropriate cooling mechanisms, such as water spray, is vital to prevent excessive heat buildup, which can lead to pulp damage and discomfort for the patient. Factors such as the type of instrument grit or improper rotation speed can contribute to issues during preparation but are secondary considerations compared to the direct friction generated in the cutting process.