Method: The root portion of an intact human maxillary central incisor was sectioned with a diamond disk 3 mm below the cement enamel junction. The pulp chamber was filled with a thermal compound and a K-type thermocouple was introduced into the pulp chamber. Six 8’ gel applications were made for each group with two 3’ light applications with 1’ intervals and oC temperature readings every 30”. The hydrogen peroxide (HP) gel concentrations utilized were 10, 15, 25 and 35%, activated by two different hybrid light sources (LED/Diode laser). The results were submitted to the ANOVA and Tukey tests (p<0.05).
Result: The blue hybrid light source (BL) without gel showed the lowest temperature (p<0.05); there was no significant difference in the temperature variation between the 10% HP gel activated with violet hybrid light source (VL) in relation to the other concentrations of gels (15, 25 and 35%) associated with the BL.
Groups |
Means+SD |
VL without gel |
38.00 ±0.00 BC |
BL without gel |
37.53 ±0.23 A |
10% HP (Lase Peroxide Light, DMC) + VL |
38.11 ±0.11 BC |
15% HP (Lase Peroxide Light, DMC) + BL |
38.19 ±0.30 C |
25% HP (Lase Peroxide II, DMC) + BL |
37.89 ±0.27B |
35% HP (Lase Peroxide, DMC) + BL |
38.10 ±0.19BC |
*Different letters in the same column (group) indicate statically significance differences (p<0.05).
Conclusion: The bleaching gels at different concentrations associated with hybrid light sources showed little variation in relation to the pulp chamber temperature increase during light activated bleaching.