IADR Abstract Archives
Efficacy and safety of photon induced photoacoustic streaming for removal of calcium hydroxide in endodontic treatment
Objectives: The aim of this in-vitro investigation was the assessment of calcium hydroxide removal by photon induced photoacoustic streaming (PIPS) compared to needle irrigation. Additionally, safety issues regarding apical extrusion of the irrigation solution were investigated. In endodontic treatment temporary intracanal medication like calcium hydroxide should be completely removed for long term success.
Methods: For removal analysis 45 artificial teeth were prepared, filled with calcium hydroxide and divided into three groups of 15 teeth each. The teeth were assigned to needle irrigation, PIPS with a lower energy setting (10 mJ, 15 Hz) or PIPS with a higher energy setting (25 mJ / 40 Hz). For comparison the weight of each tooth was measured before and after treatment. Regarding safety issues another 18 samples were filled with stained calcium hydroxide and embedded in 0.4 % agarose gel. Treatment was performed according to the three groups. Color changes in the agarose gel due to apical extrusion were digitally analysed using photoshop.
Results: No significant differences were found for calcium hydroxide removal between the two laser groups. Needle irrigation resulted in significant less calcium hydroxide removal. For apical extrusion the higher laser (25 mJ/ 40 Hz) group resulted in significant higher color changes of the periapical agarose gel than the laser group with the lower laser setting (10 mJ / 15 Hz) and the needle irrigation group.
Conclusions: PIPS with the setting of 10 mJ / 15 Hz achieved an almost complete removal of calcium hydroxide without increasing apical extrusion of the irrigation solution.
Methods: For removal analysis 45 artificial teeth were prepared, filled with calcium hydroxide and divided into three groups of 15 teeth each. The teeth were assigned to needle irrigation, PIPS with a lower energy setting (10 mJ, 15 Hz) or PIPS with a higher energy setting (25 mJ / 40 Hz). For comparison the weight of each tooth was measured before and after treatment. Regarding safety issues another 18 samples were filled with stained calcium hydroxide and embedded in 0.4 % agarose gel. Treatment was performed according to the three groups. Color changes in the agarose gel due to apical extrusion were digitally analysed using photoshop.
Results: No significant differences were found for calcium hydroxide removal between the two laser groups. Needle irrigation resulted in significant less calcium hydroxide removal. For apical extrusion the higher laser (25 mJ/ 40 Hz) group resulted in significant higher color changes of the periapical agarose gel than the laser group with the lower laser setting (10 mJ / 15 Hz) and the needle irrigation group.
Conclusions: PIPS with the setting of 10 mJ / 15 Hz achieved an almost complete removal of calcium hydroxide without increasing apical extrusion of the irrigation solution.