![]() Buccal surface preparations were performed in occluso-gingival direction for 2 minutes with 150g pressure, 350,000rpm speed and 50ml/min water coolant rates.Thermal-imaging (Thermovision-A20M FLIR Systems) assessed heat generation on buccal and APC facilitated by high-reflectance first-surface mirror (Edmund Industrial Optics). Dentinal thickness between buccal wall and APC was measured from 10 points and averaged. Rectangular tunnels were prepared to expose the axial wall of the pulp chamber (APC) from the lingual view. Methods: Thirty intact third molars were prepared by 30 round-end taper single or multi-use medium grit diamond burs (SSWhite, Brasseler). Objective: The objective of this study was to evaluate the effect of bur type and remaining dentin thickness (DT) on thermal diffusivity of dentinal tissues during high-speed tooth preparation.
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