engleski

Laser activated photoacoustic streaming in debridement of round root canals

Objectives: This study aimed to evaluate the efficacy of a new laser assisted irrigation system, SWEEPS (Shock Wave Enhanced Emission Photo-acoustic Streaming), in debriding pulp tissue from round root canals of freshly extracted premolars. Methods: Freshly extracted premolars were scanned on CBCT and only those with round root canals were used in the study (n=32). The samples were randomly divided into four experimental groups and the control group: Group 1. Reciproc Blue (RB25/.06) root canal instrumentation and conventional syringe irrigation (CI) of final irrigation protocol (FIP) ; Group 2. RB25 instrumentation and ultrasonically activated irrigation (UAI) of the FIP ; Group 3. RB25 instrumentation and SWEEPS activation of the FIP ; Group 4. Only SWEEPS activation of 3% sodium hypochlorite (NaOCl) for 4x30 s without instrumentation. In groups 1, 2 and 3, the total amount of 5 mL of 3% NaOCl was used during instrumentation, and the FIP included:3% NaOCl (30 s), ethylenediaminotetraacetic acid (60 s) and 3% NaOCl (30 s). Eight additional uninstrumented samples served as histological controls. The specimens were demineralized and processed for histological evaluation for measurement of the remaining pulp tissue (RPT) in each canal third. The results were analysed with Mann-Whitney U test (α =0.05). Results: There was significant decrease of the RPT in all experimental groups (p<0.05). In the middle third, instrumentation with UIA and SWEEPS had similar efficacy (p=0.171), which was greater than CI group and only SWEEPS without instrumentation (p<0.05). In the apical part, SWEEPS with instrumentation was the most efficient (p=0.002) in the removal of the RPT, and no difference between UIA and CI groups (p=0.643) was reported. Conclusions: The new SWEEPS technique was more effective than UIA and CI in the removal of RPT in the apical part of round canals after RB25 single file instrumentation. Only SWEEPS without instrumentation was not efficient in root canal debridement.

laser activated irrigation ; SWEEPS, pulp remnants

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