ArticleRestorative dentistry & endodontics2025
In vitro experimental study comparing continuous and intermittent irrigation protocols: influence of sodium hypochlorite volume and contact time on tissue dissolution.
Article in Restorative dentistry & endodontics, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Objectives: This study aimed to evaluate whether continuous irrigation with larger volumes or allowing sodium hypochlorite (NaOCl) resting time is more critical for pulp tissue dissolution using a controlled artificial root canal system. Methods: A three-dimensional printed artificial root canal with a lateral canal in the apical third was fabricated. Standardized bovine pulp tissue specimens were inserted, and three irrigation protocols were tested: group A (continuous NaOCl irrigation at 1 mL/min via syringe pump), group B (intermittent NaOCl irrigation with 0.1 mL and a 3-minute resting period), and group C (control, saline irrigation). The time for complete dissolution and the total NaOCl volume were recorded. Results: Complete dissolution occurred in groups A and B, with significant differences in NaOCl volume and time (p < 0.05). In group A, complete dissolution was consistently observed after the 6th irrigation cycle, corresponding to a total NaOCl volume of 6.0 ± 0.66 mL per test. The average time required for complete dissolution in this group was 6 ± 0.66 minutes. In group B, complete dissolution occurred after the 4th cycle, with a total NaOCl volume of 0.4 ± 0.06 mL per test and a mean dissolution time of 12.6 ± 1.8 minutes. Conclusions: NaOCl volume and exposure time significantly influence pulp tissue dissolution.
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