Analysis of apical sealing of canals irradiated with Er: YAG and Nd: YAG lasers and filled with AH Plus®

Resumo

Laser technology is gaining increasing importance in
dental practice and also in the field of Endodontics with its ability
to promote disinfection and experimentally in the preparation of
root canal. The action of different types of lasers results in changes
representing the increase in permeability of dentinal tissue (Er: YAG)
or sometimes by a decrease in melting and recrystallization of dentin
(Nd: YAG). Objective: this study assessed through apical dye leakage,
the influence of irradiation with two types of laser, regarding to the
quality of apical sealing of endodontic fillings. Material and methods:
Thirty-six single-rooted teeth were used after being prepared with the
ProFile system up to size #40 instrument and then divided into four
experimental and two control groups. The technique used previously
to the filling was as follows: G1 – not irradiated; G2 – irradiated with
Er: YAG; G3 – irradiated with Nd: YAG and G4 – irradiated with Er:
YAG followed by Nd: YAG. After external waterproofing and dry, the
specimens were filled with a cold vertical condensation technique,
using AH Plus sealer, and immediately immersed into 0.5% methylene
blue solution for subsequent cleavage. The linear values of apical
marginal leakage were obtained with the aid of an optical microscope
connected to a computer using the Image Lab® software. Results: Data
analysis showed the non-existence of statistically significant (p = 0.05)
differences between different groups. Conclusion: It was concluded
that the laser does not have influence on the apical sealing.