engleski

Effect of photon induced photoacoustic streaming (PIPS) on bond strength to dentine of two root canal filling materials

Aim: To evaluate the effect of photon induced photoacoustic streaming (PIPS) technique in combination with EDTA on bond strength of gutta-percha/AH Plus and Resilon/RealSeal SE root canal fillings to root dentine. Methodology: Forty freshly extracted human maxillary anterior teeth with intact straight roots, were instrumented endodontically with rotating ProTaper instruments and randomly divided into two experimental groups. In group 1 (n=20), root canals were rinsed for 1 min with 2 ml of 17% EDTA. In group 2 (n=20), Er:YAG laser, with a 14-mm long 400 micron diameter tapered PIPS tip, was used for 1 min with 2 ml of 17% EDTA. The laser parameters used were: 20 mJ per pulse, 15 Hz, 50 µs. In each experimental group, half of the root canals (n=10) were obturated with gutta- percha/AH Plus and other half (n=10) with Resilon/RealSeal SE. A micropush-out test was performed using a universal testing machine and resistance to failure plus failure modes were determined. Results: Both gutta-percha/AH Plus groups had higher bond strength to root dentin than the Resilon/RealSeal SE groups (p<0.05). The smear layer removal protocol, with EDTA only or combining PIPS technique with EDTA, had no influence on bond strength of gutta-percha/AH Plus or Resilon/RealSeal SE (p>0.05). Conclusions: Gutta-percha/AH Plus groups exhibited higher bond strength in comparison to the Resilon/RealSeal SE groups. The PIPS technique with EDTA used for smear layer removal did not influence the bond strength of gutta- percha/AH Plus or Resilon/RealSeal SE to root dentine by comparison to EDTA irrigation alone.

PIPS ; Resilon

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