---
title: Biofilm Removal by 6% Sodium Hypochlorite Activated by Different Irrigation Techniques
description: Discover the most effective irrigation techniques for biofilm removal using 6% sodium hypochlorite.
image: https://www.nationaldental.com/hubfs/AI-Generated%20Media/Images/The%20image%20depicts%20a%20laboratory%20setup%20showcasing%20various%20dental%20irrigation%20techniques%20In%20the%20center%20a%20clear%20glass%20apparatus%20displays%20bovine%20root%20canal-2.jpeg
---

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# Biofilm Removal by 6% Sodium Hypochlorite Activated by Different Irrigation Techniques

[ National Dental Innovations ](https://www.nationaldental.com/fotona-case-studies/author/national-dental-innovations) Jun 10, 2025 3:12:38 PM

![](https://www.nationaldental.com/hubfs/AI-Generated%20Media/Images/The%20image%20depicts%20a%20laboratory%20setup%20showcasing%20various%20dental%20irrigation%20techniques%20In%20the%20center%20a%20clear%20glass%20apparatus%20displays%20bovine%20root%20canal-2.jpeg)

### Contents

[Jun 10, 2025 3:12:43 PM

Efficacy of Photon-induced Photoacoustic Streaming in the Reduction of E. faecalis within the Root Canal

](https://www.nationaldental.com/fotona-case-studies/efficacy-of-photon-induced-photoacoustic-streaming-in-the-reduction-of-enterococcus-faecalis-within-the-root-canal-different-settings-and-dif-1749568150949) [Jun 10, 2025 3:12:35 PM

PIPS Outperforms Traditional Irrigation in Complex Canal Systems

](https://www.nationaldental.com/fotona-case-studies/pips-outperforms-traditional-irrigation-in-complex-canal-systems) [Jun 10, 2025 3:12:39 PM

Disinfection Efficacy of Photon-Induced Photoacoustic Streaming on Root Canals Infected with E. Faecalis

](https://www.nationaldental.com/fotona-case-studies/disinfection-efficacy-of-photon-induced-photoacoustic-streaming-on-root-canals-infected-with-enterococcus-faecalis-an-ex-vivo-study)

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*A comparison of irrigation methods reveals how activation technique impacts biofilm removal efficiency.*

**Authors**: R. Ordinola-Zapata, C.M. Bramante, R.M. Aprecio, R. Handysides, D.E. Jaramillo  
**Journal**: *International Endodontic Journal* (2013)

Objective

To compare the effectiveness of four different irrigation techniques for removing biofilm from a bovine root canal model using 6% sodium hypochlorite (NaOCl).

## Materials and Methods

- **Samples**: Fifty dentine specimens (2 × 2 mm) infected with biofilm, placed in prepared cavities within bovine root canals.
- **Irrigation protocol**:
  
    - Each canal irrigated twice with 2 mL of 6% NaOCl for 2 minutes (total 4 minutes).
    - Four irrigation techniques applied for 60 seconds (3 × 20 s intervals):
      
          - Conventional needle irrigation
          - Endoactivator (sonic agitation)
          - Passive ultrasonic irrigation (PUI)
          - Laser-activated irrigation (photon-induced photoacoustic streaming, PIPS)
    - Controls: distilled water and conventional needle irrigation.
- **Analysis**:
  
    - Dentine samples analyzed by scanning electron microscopy (SEM).
    - Fifteen operative fields per block; images assessed by two calibrated evaluators using a four-degree scale.
    - Nonparametric statistical tests compared groups.

Key Results

- **Laser-activated irrigation (PIPS)**: Achieved the most effective biofilm removal.
- **Passive ultrasonic irrigation (PUI)**: Significantly more effective than Endoactivator and needle irrigation.
- **Endoactivator vs. Needle irrigation**: No significant difference.
- **Controls**: Showed the least biofilm removal.

## Conclusions

Laser activation of 6% sodium hypochlorite (PIPS) significantly enhances biofilm removal from dentine, outperforming all other tested methods. Passive ultrasonic irrigation is the next most effective technique, while sonic and conventional needle irrigation are less effective and not significantly different from each other.

[ACCESS THE FULL ARTICLE HERE](https://pubmed.ncbi.nlm.nih.gov/24117881/)

[Scientific Study](https://www.nationaldental.com/fotona-case-studies/tag/scientific-study) [Endodontics](https://www.nationaldental.com/fotona-case-studies/tag/endodontics)

[Jun 10, 2025 3:12:43 PM

Efficacy of Photon-induced Photoacoustic Streaming in the Reduction of E. faecalis within the Root Canal

](https://www.nationaldental.com/fotona-case-studies/efficacy-of-photon-induced-photoacoustic-streaming-in-the-reduction-of-enterococcus-faecalis-within-the-root-canal-different-settings-and-dif-1749568150949) [Jun 10, 2025 3:12:35 PM

PIPS Outperforms Traditional Irrigation in Complex Canal Systems

](https://www.nationaldental.com/fotona-case-studies/pips-outperforms-traditional-irrigation-in-complex-canal-systems) [Jun 10, 2025 3:12:39 PM

Disinfection Efficacy of Photon-Induced Photoacoustic Streaming on Root Canals Infected with E. Faecalis

](https://www.nationaldental.com/fotona-case-studies/disinfection-efficacy-of-photon-induced-photoacoustic-streaming-on-root-canals-infected-with-enterococcus-faecalis-an-ex-vivo-study)

[Previous

Elimination of Intracanal Tissue and Debris Through a Novel Laser-Activated System

](https://www.nationaldental.com/fotona-case-studies/elimination-of-intracanal-tissue-and-debris-through-a-novel-laser-activated-system-assessed-using-high-resolution-micro-computed-tomography-a-pilot-study)

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Disinfection Efficacy of Photon-Induced Photoacoustic Streaming on Root Canals Infected with E. Faecalis

](https://www.nationaldental.com/fotona-case-studies/disinfection-efficacy-of-photon-induced-photoacoustic-streaming-on-root-canals-infected-with-enterococcus-faecalis-an-ex-vivo-study)

## Leave a Comment

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