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Temperature changes in the deciduous pulp chamber during cavity preparation with the Er:YAG laser
Mariana Silvério Castilho1, Aline Evangelista de Souza-Gabriel, Melissa Andrea Marchesan
1Department of Dentistry, University of Ribeirão Preto, São Paulo, Brazil.
Purpose:
The purpose of this in vitro study was to evaluate the temperature changes in the pulp chambers of deciduous molars during cavity preparation with an Er:YAG (erbium substituted: yttrium aluminium garnet) laser.
Methods:
Two cavities were prepared in 14 maxillary deciduous molars: one with the Er:YAG laser and other with a diamond bur using a high-speed handpiece (control), providing 4 groups with 7 cavities each. The laser treatment was applied for 30 seconds (group 1) and 60 seconds (group 3). The internal pulp temperature was recorded during preparation procedures with a thermocouple, and temperature changes were calculated by the difference between the maximum and initial temperature.
Results:
There were significant differences (P<.01) between Er:YAG laser irradiation for 60 seconds and 30 seconds and the 2 high-speed drilling groups, which were similar. The Er:YAG laser used for 60 seconds provided the highest temperature alteration (4.01 degrees C).
Conclusion:
Er:YAG laser irradiation increased the temperature of the deciduous teeth compared to the high-speed drilling treatment. The temperature increments, however, remained below the critical value (5.5 degrees C).
