Effect of diode laser irradiation on the apical sealing of MTA retrofillings

Abstract

Apical sealing is essential for the success of paraendodontic surgery, so any procedure that may favor an adequate sealing of the apical remainder should be performed. The purpose of this study was to evaluate the influence of diode laser irradiation on the apical sealing of root-end cavities with MTA retrofillings. Root canals in twenty extracted human teeth were shaped with K-files and filled with gutta-percha. The apexes were cut off and root-end preparations were performed. The roots were divided randomly in 2 groups. Group 1 (ten specimens) was retrofilled with MTA. Group 2 was irradiated with diode laser, with 1 W for 20 seconds, on the apical surface and root end cavity before retrofilling with MTA. The specimens had their external surfaces impermeabilized with cyanoacrylate, except for the apical surface, and were then immersed in 1% rhodamine B dye for 72 h and placed in plaster stone. After that, the specimens were submitted to longitudinal abrasion until half of the root remained. The linear dye leakage was observed in these mid-roots between the root canal wall and retrofilling. The linear dye leakage was measured with Image Lab software, and the results were statistically analyzed with Student's t test. There were no statistically significant differences between the two groups (p > 0.05). The diode laser irradiation did not improve the apical sealing of MTA retrofillings under the conditions of this in vitro study.

Effectiveness of different final irrigation techniques and placement of endodontic sealer into dentinal tubules

“…24 Rhodamine B isothiocyanate is a fluorescent dye with chemical formula C 29 H 30 ClN 3 O 3 S frequently used in CLSM 11,25 and in leakage studies. 26,27 Rhodamine has excellent phototophysic properties such as high levels of absorption coefficient and quantum yield. 28 The specific amount of dye was selected by empirical method 25 and 0.3 mg/mL was chosen as the appropriate concentration for endodontic AH Plus sealer studies, as reported by our pilot study.…”

Mineral Trioxide Aggregate: A Comprehensive Literature Review—Part II: Leakage and Biocompatibility Investigations

“…Two experiments evaluated the effect of a laser on AMTA as a rootend filling material (80,81). The first study showed that diode laser irradiation does not improve the apical seal of AMTA (80).…”

“…The first study showed that diode laser irradiation does not improve the apical seal of AMTA (80). A dye leakage study compared a combination of using Er,Cr:YSGG laser and an AMTA root-end filling with laser and cyanoacrylate (81).…”

Evaluation of Ultrasonic and ErCr:YSGG Laser Retrograde Cavity Preparation

“…Root end cavities prepared by using the Erbium: Yttrium, Aluminium, Garnet (Er:YAG) laser show smaller microleakage than those prepared using an ultrasonic instrument (18). However, the diode laser irradiation does not improve the apical sealing of mineral trioxide aggregate retrofillings (20). The Erbium, Chromium: Yttrium, Scandium, Gallium, Garnet (ErCr:YSGG) laser (Waterlase, Biolase Technology, San Clemente, CA) can be used for the removal of the smear layer (21), biomechanical preparation (22), apicoectomies, root end preparation, hemostasis, and sterilization of the root end apex and surrounding tissues (19).…”