Effects of Low-Laser Therapy and LED- mediated Photobiomodulation on pulp canal volume of maxillary first premolars undergoing orthodontic tooth movement – A pilot study

Abstract

Abstract Objectives To assess the effects of Low-Level Laser Therapy (LLLT) and LED – mediated Photobiomodulation(LED-PBM) on pulp volume of maxillary first premolars. Materials and Methods Seventy-six micro-CT scans of maxillary first premolars were collected as part of two randomized clinical trials. All premolars were subjected to 150g buccal tipping force for 4 weeks. Twenty premolars received LLLT and 18 premolars had received LED-PBM while their contra-lateral teeth were served as controls. Premolars were then extracted as part of the treatment plan. The volume of the tooth roots and pulp canal were then analysed. Results The average pulp volume for premolars received LLLT and the controls were 19.71mm3 and 17.95mm3 respectively. However, the difference was not statistically significant (p = 0.135). The average pulpal volume for LED-PBM premolars and the controls were 14.11mm3 and 15.65mm3 respectively. The difference was not statistically significant (p = 0.193) either. Univariate analysis of variance indicated that the application of LLLT or LED-PBM does not result in statistical difference changes in pulpal volume. There was no correlation between pulp volume change and difference in the total amount of root resorption caters developed following the application of LLLT and LED-PBM. Conclusion No significant difference was found on the pulp canal volume of maxillary first premolars between experimental and control groups when LLLT or LED-PBM was applied for 4 weeks in addition to 150g of orthodontic force. Clinical Relevance: The use of LLLT or LED-PBM has no known effects on pulp tissues.