Heat production and bacteriostatic effect of neodymium laser and semiconductor laser on cavity disinfection: in-vitro study

doi:10.12307/2021.235

Abstract

Abstract: BACKGROUND: Local effective disinfection method can kill the bacteria to the maximum extent, so as to prevent the recurrence and development of caries. As a new technology, laser destroys the cell membrane of bacteria through its thermal and biological stimulation effects.
OBJECTIVE: To evaluate the safety and effectiveness of cavity disinfection with neodymium laser (Nd:YAP, Nd:YAG) and semiconductor laser (Diode).
METHODS: The intact premolars were collected and the isolated alveolar cavity model was prepared. Samples should be processed with Nd:YAP laser, 810 nm semiconductor (Diode), and Nd:YAG laser, separately. The pulp temperature was monitored by thermocouple temperature measuring instrument. The growth of Streptococcus mutans and Lactobacillus was observed by colony counting.
RESULTS AND CONCLUSION: (1) The pulp temperature increased with the increase of irradiation power. (2) At the same power, different laser disinfection, the temperature was increased and less than the pulp necrosis 5.5 °C, when the power was 1.8 and 4.0 W. Nd:YAP laser temperature was higher than Nd:YAG laser and semiconductor laser group (P < 0.05). (3) Colony count showed that with the same laser, the number of colonies decreased significantly with the increase of laser power; compared with the negative control group (normal saline group), the difference was statistically significant (P < 0.05). (4) There was no statistical difference between 1.8 W, 3.0 W, and 4.0 W groups and positive control group (5.25% NaClO solution) (P > 0.05). (5) The results show that, based on the principles of safety, effectiveness and minimum power, the optimal power that can be selected for the three kinds of lasers in the disinfection of cavities is 1.8 W.

Key words: neodymium laser, Nd:YAP, Nd:YAG, semiconductor laser, thermal effect, pulp temperature, cavity disinfection

CLC Number:

Liang Xiaoyue, Zou Zhaohui, Dong Xiaoxi, Zhang Yu. Heat production and bacteriostatic effect of neodymium laser and semiconductor laser on cavity disinfection: in-vitro study[J]. Chinese Journal of Tissue Engineering Research, 2021, 25(34): 5432-5438.

Figures/Tables 6

References

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