Effect of 810 nm diode laser disinfection on bond strength of resin sealer to radicular dentin –an in vitro study

Valluri Bhanu Pratap., Madhu varma K., Girija Sajjan S and Kalyan Satish R

Objective: The use of lasers in endodontic treatment aims to combine the effects of bio mechanical preparation, irrigants and the energy produced by laser systems to promote debridement and cleaning of root canal walls. Studies have shown that morphological alterations in dentin irradiated with diode laser were observed by scanning electron microscopy. The present study is to evaluate the effect of laser irradiation (ʎ=810nm) on the Push-out bond strength of resin sealer to root dentin at different energy levels.

Materials and Methods: Forty single rooted extracted human teeth were selected for the study. After the coronal part was sectioned the biomechanical preparation up to F5 protaper file was done .The samples were divided into four groups (n=10 per group) and irrigated with 5.25% sodium hypochlorite. In groups 1,2and 3, 810nm diode laser at 1.5W, 3W, 7W continuous mode was used for disinfection respectively. Group 4 served as control. The root canal was coated with AH plus sealer and obturated with gutta percha.
The samples were stored in distilled water for seven days. The root samples were mounted in acrylic and sectioned (2mm thick) at coronal and middle1/3rd and subjected to push out bond strength measured using universal testing machine.

RESULTS: The push-out bond strength of the laser irradiated group showed significantly higher values than control group (p<0.05).

Conclusion: The application of 810 nm diode laser in the human root canal dentine increased the bond strength of Resin sealer (AH Plus).

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