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01.12.2015 | Research article | Ausgabe 1/2015 Open Access

BMC Oral Health 1/2015

Apical extrusion of sodium hypochlorite activated with two laser systems and ultrasonics: a spectrophotometric analysis

BMC Oral Health > Ausgabe 1/2015
Bağdagül Helvacıoğlu Kıvanç, Hacer Deniz Arısu, Nazlı Özge Yanar, Hülya Mercan Silah, Recai İnam, Güliz Görgül
Wichtige Hinweise

Competing interests

The authors declare that they have no competing interests.

Authors’ contributions

BHK formulated the conception and design of the study, participated in data acquisition and interpretation of data analysis and prepared the manuscript. HDA participated in the design of the study and interpretation of data analysis and performed the stastistical analysis. NÖY participated in data acquisition. HMS carried out the chemical analysis. Rİ contributed to data acquisition and interpretation of the chemical anaysis. GG participated in its design and coordination. All authors read and approved the final manuscript.



The aim of the present study was to compare the effect of ultrasonically or laser (Nd:YAG or diode) activated irrigation on the irrigating solution extrusion compared to non-activated syringe irrigation.


Extracted mandibular premolar teeth (n = 48) with single canals were instrumented. The teeth were secured through the lid of an Eppendorf tube filled with 1.0 mL distilled water to collect the apically extruded irrigating solution. The teeth were randomly divided into four groups: non-activated syringe irrigation, diode laser, Nd:YAG laser and passive ultrasonic irrigation (PUI) using 2 % NaOCl. The irrigating solution extruded through the apical foramen was collected in the Eppendorf tube and evaluated by a chemical reaction with using a spectrophotometer. The data was analyzed using one-way ANOVA and Tukey’s post hoc test (α = 0.05).


All the groups showed apically extruded irrigating solution. There were significant differences among the groups (p < 0.05). Nd:YAG laser activated irrigation showed greater extrusion (p < 0.05), while the non-activated syringe irrigation showed less extrusion (p < 0.05). Only the difference between diode laser and PUI was not statistically significant (p > 0.05).


Within the limitations of this in vitro study, the researchers concluded that non-activated syringe irrigation caused less apically extruded irrigating solution than PUI and LAI using Nd:YAG or diode lasers.
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