IADR Abstract Archives
Debridement of Root Canal Isthmus by Laser Activated Photoacoustic Streaming
Objectives: This study aimed to evaluate the efficacy of a new Er:YAG laser assisted irrigation system, Shock Wave Enhanced Emission Photo-acoustic Streaming (SWEEPS), in the removal of pulp tissue from root canal isthmus area in lower molars, and to compare it with ultrasonically activated irrigation (UAI) and conventional needle irrigation (CI),
Methods: The study sample consisted of 41 lower molars with the presence of an isthmus between mesial canals based on cone-beam computed tomographic analysis. The selected teeth were randomly distributed into experimental groups (n=12/each) and a control group (C) (n=5). The traditional access cavity of the mesial part of each tooth was made in all samples. In the experimental samples, the mesial root canals were instrumented with Wave One Gold Primary (25/.07) file using 3ml of 3% sodium hypochlorite (NaOCl), during 5min. The distal canal served as control of the presence of pulp tissue in the tooth. Then, the root canals were irrigated with final irrigation protocol (FIP) using one of the following techniques: SWEEPS; UAI; CI. The FIP included sequential application of 3ml 3% NaOCl (60s), 2ml ethylenediaminotetraacetic acid (EDTA) (60s) and 3ml 3% NaOCl (30s). In C, no treatment was performed. Sections from the isthmus region (3-4mm from the apex) were processed for histological evaluation to measure remaining pulp tissue (RPT). The results were analysed using ANOVA and Kruskal-Wallis test (α=0.05).
Results: No significant differences in the relative surface area of root canals and isthmus was reported among groups (p>0.05). Samples in the SWEEPS group had significantly less remaining pulp tissue (ranging between 1.4-7.4%) than UAI, CI and C (p=0.003, 0.014, 0.003). There were no difference between the UAI and CI (p=0.583).
Conclusions: SWEEPS was the most efficient in debridement of root canal isthmus area, and UAI and CI showed similar but lower efficiency.
Methods: The study sample consisted of 41 lower molars with the presence of an isthmus between mesial canals based on cone-beam computed tomographic analysis. The selected teeth were randomly distributed into experimental groups (n=12/each) and a control group (C) (n=5). The traditional access cavity of the mesial part of each tooth was made in all samples. In the experimental samples, the mesial root canals were instrumented with Wave One Gold Primary (25/.07) file using 3ml of 3% sodium hypochlorite (NaOCl), during 5min. The distal canal served as control of the presence of pulp tissue in the tooth. Then, the root canals were irrigated with final irrigation protocol (FIP) using one of the following techniques: SWEEPS; UAI; CI. The FIP included sequential application of 3ml 3% NaOCl (60s), 2ml ethylenediaminotetraacetic acid (EDTA) (60s) and 3ml 3% NaOCl (30s). In C, no treatment was performed. Sections from the isthmus region (3-4mm from the apex) were processed for histological evaluation to measure remaining pulp tissue (RPT). The results were analysed using ANOVA and Kruskal-Wallis test (α=0.05).
Results: No significant differences in the relative surface area of root canals and isthmus was reported among groups (p>0.05). Samples in the SWEEPS group had significantly less remaining pulp tissue (ranging between 1.4-7.4%) than UAI, CI and C (p=0.003, 0.014, 0.003). There were no difference between the UAI and CI (p=0.583).
Conclusions: SWEEPS was the most efficient in debridement of root canal isthmus area, and UAI and CI showed similar but lower efficiency.