IADR Abstract Archives
Effectiveness of sonic, ultrasonic and laser irrigation on filling materials removal in premolar root canals
Objectives: The aim of this in vitro study was to assess the effectiveness of sonic, ultrasonic and laser irrigation activation in removing filling remnants from the root canal of the maxillary first premolars after the standard canal retreatment procedure with ProTaper universal rotary retreatment system using micro-computed tomography (micro-CT) and scanning electron microscopy (SEM).
Methods: Twenty-eight maxillary first premolars were instrumented with ProTaper Ni-Ti rotary instruments and obturated with gutta-percha and AH plus sealer. After stored at 37°C and 100% humidity for 1 week, the specimens were retreated with ProTaper universal retreatment system for removing filling materials. Then, the teeth were randomly assigned into four groups (n = 7): group 1- positive control; group 2- retreated with sonic irrigation; group 3- retreated with ultrasonic irrigation; and group 4- retreated with laser irradiation. The specimens were scanned with micro-CT before instrumentation, after obturation, after initial retreatment and after additional retreatment. Three-dimension of the specimen were reconstructed, and the percentage volume of the remaining filling materials were measured. Finally, the specimens were split longitudinally after micro-CT scan, and canal walls were examined with SEM, the amount of residual filling materials were scored. Data were analyzed with the paired sample t test, one way analysis of variance test as appropriate (p = 0.05).
Results: The mean percentage volume of the remaining filling materials among the four groups was similar after initial retreatment. The filling materials removal efficacy of three experimental groups was higher than that of control group (p<0.05), whereas filling materials ranged from 1.46-2.21mm3 were left in the canal in all three experimental groups. Additionally, a significant greater reduction of the amount of the remaining filling materials in PIPS group as compared with sonic and ultrasonic groups (both p<0.05), and significantly higher reduction in ultrasonic group than sonic group (p<0.05).
Conclusions: PIPS showed significantly better performance than sonic and ultrasonic irrigation in cleaning the remaining filling materials left after initial retreatment, and ultrasonic technique performed better than sonic technique.
Methods: Twenty-eight maxillary first premolars were instrumented with ProTaper Ni-Ti rotary instruments and obturated with gutta-percha and AH plus sealer. After stored at 37°C and 100% humidity for 1 week, the specimens were retreated with ProTaper universal retreatment system for removing filling materials. Then, the teeth were randomly assigned into four groups (n = 7): group 1- positive control; group 2- retreated with sonic irrigation; group 3- retreated with ultrasonic irrigation; and group 4- retreated with laser irradiation. The specimens were scanned with micro-CT before instrumentation, after obturation, after initial retreatment and after additional retreatment. Three-dimension of the specimen were reconstructed, and the percentage volume of the remaining filling materials were measured. Finally, the specimens were split longitudinally after micro-CT scan, and canal walls were examined with SEM, the amount of residual filling materials were scored. Data were analyzed with the paired sample t test, one way analysis of variance test as appropriate (p = 0.05).
Results: The mean percentage volume of the remaining filling materials among the four groups was similar after initial retreatment. The filling materials removal efficacy of three experimental groups was higher than that of control group (p<0.05), whereas filling materials ranged from 1.46-2.21mm3 were left in the canal in all three experimental groups. Additionally, a significant greater reduction of the amount of the remaining filling materials in PIPS group as compared with sonic and ultrasonic groups (both p<0.05), and significantly higher reduction in ultrasonic group than sonic group (p<0.05).
Conclusions: PIPS showed significantly better performance than sonic and ultrasonic irrigation in cleaning the remaining filling materials left after initial retreatment, and ultrasonic technique performed better than sonic technique.