Key Points
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In this study low and high torque handpieces and Er:YAG laser did not promote an increase in intrapulpal temperature higher than 5°C.
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Even the high torque handpiece did not promote a statistically significant high temperature increase.
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The Er:YAG laser generated a lower temperature rise. This fact denotes the possible advantage of Er:YAG laser compared to the conventional handpieces.
Abstract
Objective The aim of this study was to compare intrapulpal temperature increases produced by a high-speed high-torque (speed-increasing) handpiece, a high-speed low-torque handpiece (air-turbine) and an Er:YAG (Erbium: Yttrium-Aluminum-Garnet) laser.
Subject and methods Thirty bovine incisors were reduced to a dentine thickness of 2.0 mm. Class V preparations were prepared to a depth of 1.5 mm, measured with a caliper or by a mark on the burs. A thermocouple was placed inside the pulp chamber to determine temperature increases (°C). Analysis was performed on the following groups (n = 10) treated with: G1, low-torque handpiece; G2, high-torque handpiece; and G3, Er:YAG laser (2.94 μm at 250 mJ/4 Hz), all with water cooling. The temperature increases were recorded with a computer linked to the thermocouples.
Results The data were submitted to ANOVA and Tukey statistical test. The average temperature rises were: 1.92±0.80°C for G1, 1.34±0.86°C for G2, and 0.75±0.39°C for G3. There were significant statistical differences among the groups (p = 0.095). All the groups tested did not have a change of temperature that exceeds the threshold of 5.5°C.
Conclusion Temperature response to the low and high torque handpieces seemed to be similar, however the Er:YAG laser generated a lower temperature rise.
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Firoozmand, L., Faria, R., Araujo, M. et al. Temperature rise in cavities prepared by high and low torque handpieces and Er:YAG laser. Br Dent J 205, E1 (2008). https://doi.org/10.1038/sj.bdj.2008.491
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DOI: https://doi.org/10.1038/sj.bdj.2008.491
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