Journal
JOURNAL OF ENDODONTICS
Volume 26, Issue 3, Pages 138-141Publisher
LIPPINCOTT WILLIAMS & WILKINS
DOI: 10.1097/00004770-200003000-00002
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This in vitro study compared temperature rises during cavity preparation with an Er:YAG laser, Nd: YAP laser, and a high-speed handpiece, Eighteen teeth were sectioned longitudinally and divided into six groups: group 1 was treated with a carbide bur on a high-speed dental handpiece; group 2 was treated with an Er:YAG laser with an energy of 140 mJ, a pulse repetition rate of 4 Hz; and group 3 was treated with an Nd:YAP laser with an energy of 240 mJ, a pulse repetition rate of 10 Hz, In these groups no water cooling was used. Groups 4 to 6 were treated in the same way, but with water spray. Temperature increases were measured at different dentin thicknesses by a microthermocouple attached to the inner side of the pulp chamber. Water cooling was essential to reduce temperature effects in all groups. Nd:YAP laser induced significantly higher temperature rises than Er:YAG or handpiece, Temperature response to the Er:YAG laser and the handpiece seemed to be similar.
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