Temperature Evaluation of Nd:YAG Laser for Dentin Hypersensitivity Protocols
Objectives: This study evaluated the Nd:YAG laser and its association with photoabsorber for dentin hypersensitivity (DH) protocols. Methods: Superficial temperature (ST) and internal temperature variation (Delta-T) were assessed during irradiation of the buccal cervical area of human premolar teeth. A thermal camera and thermocouples (TC) were used. Pulp tissue was removed and the chamber was filled with distilled water. The TC-0 was positioned inside the pulp chamber, closer to the lingual side, and TC-1, closer to the buccal side. TC-2 was positioned inside the root canal. During irradiation, teeth were kept inside a water bath/37°C. Six experimental groups were tested (n=5): G1/G4 – 1W, 100mJ, 85J/cm2; G2/G5 – 0,7W, 70mJ, 50J/cm2; G3/G6 – 0,5W, 50mJ, 35J/cm2. G1, G2 and G3 were associated with a photoabsorber (1:1 ground charcoal and deionized water) applied on the predefined area of the teeth prior to irradiation. The other groups were treated with the laser only. ST data from the thermal camera were recorded as absolute values of °C and the TC located inside the pulp chamber recorded the Delta-T in °C. Data from ST and Delta-T were statistically analyzed by One-way and Two-way ANOVA for repeated measures, respectively, with pairwise comparison of treatments by Tukey (p<0.05). Results: For ST, results showed that G1 presented significant higher temperature (p<0,001) but there were no significant differences among the other groups (p>0,05). Considering the internal temperature evaluation, there were no significant differences among groups (p>0,05). TC1’s Delta-T was significantly higher than the TC0 and TC2 measurements for all groups (p<0,001). Conclusions: Therefore, the 1W protocol with photoabsorber seems to increase more the ST. Delta-T for all groups were higher in the pulp chamber closer to the irradiation (TC-1), and for all groups the Delta-T were similar for all protocols. It can be concluded that Nd:YAG laser irradiation can be a safe treatment for DH.
Division:IADR/AADR/CADR General Session
Meeting:2020 IADR/AADR/CADR General Session (Washington, D.C., USA) Location:Washington, D.C., USA
Year: 2020 Final Presentation ID:3412 Abstract Category|Abstract Category(s):Dental Materials 6: Instruments and Equipment
Authors
Maximiano Silva, Vinícius
( Dentistry School of University of São Paulo
, São Paulo
, São Paulo
, Brazil
)
De Lima Pereira, Daísa
( Center of Lasers and Applicabilities
, São Paulo
, Brazil
)