Abstract
This study aimed to evaluate the effects of low-level laser therapy (LLLT) on pulpal response of primary teeth. Twenty mandibular primary molars were randomly divided into the following groups: group I Buckley’s formocresol (diluted at 1:5), group II calcium hydroxide, group III LLLT + zinc oxide/eugenol, and group IV LLLT + calcium hydroxide. LLLT parameters were set at 660-nm wavelength, 10-mW power output, and 2.5 J/cm2 energy density for 10 s in continuous mode (InGaAlP laser, Twin Laser®, MMOptics, Sao Carlos, Sao Paulo, Brazil). The teeth were extracted at the regular exfoliation period. The dentin-pulp complex was graded by an established histopathological score system. Statistical analysis was performed by Kruskal-Wallis and chi-square test. The histopathological assessment revealed statistically significant differences among groups (P < 0.05). The lowest degree of pulpal inflammation was present in LLLT + calcium hydroxide (P = 0.0296). Calcium hydroxide showed the highest rate of hard tissue barrier (P = 0.0033), odontoblastic layer (P = 0.0033), and dense collagen fibers (P = 0.0095). On the other hand, formocresol showed the highest incidence of internal resorption (P = 0.0142). Based on this study, low-level laser therapy preceding the use of calcium hydroxide exhibited satisfactory results on pulp tissue healing. However, further clinical studies on human teeth with long-term follow-up are needed to test the low-level laser therapy efficacy.
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Acknowledgments
The authors would like to thank all the volunteers and the financial support of the Sao Paulo Research Foundation (FAPESP grant nos. 2009/11284-4 to TMO). The authors would like to thank Daniele Santi Ceolin and Patrícia De Sá Mortágua Gemino for their excellent laboratorial assistance.
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Marques, N.C.T., Neto, N.L., Rodini, C.d.O. et al. Low-level laser therapy as an alternative for pulpotomy in human primary teeth. Lasers Med Sci 30, 1815–1822 (2015). https://doi.org/10.1007/s10103-014-1656-7
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DOI: https://doi.org/10.1007/s10103-014-1656-7