Elsevier

Journal of Endodontics

Volume 32, Issue 11, November 2006, Pages 1102-1106
Journal of Endodontics

Basic research—technology
Cleaning Efficacy and Dentin Micro-Hardness After Root Canal Irrigation With a Strong Acid Electrolytic Water

https://doi.org/10.1016/j.joen.2006.07.003Get rights and content

Abstract

The purpose of this study was to evaluate the cleaning effect of root canal walls using strong acid electrolytic water (SAEW) as a root canal irrigant, and to investigate the influence of SAEW on the root canal dentin by micro-hardness test. Forty-three single-rooted, single-canaled teeth were instrumented using standard step-back technique with K-files. Irrigation was performed using distilled water, 5.25% NaOCl and 3% H2O2, SAEW, or 15% EDTA solution in five groups. Samples were prepared to be examined under a scanning electron microscope (SEM) and micro Vickers hardness (HV) test machine. Our results showed that the root cleaning effects of the combined use of SAEW and NaOCl solution as root canal irrigants were equivalent to those in the group with NaOCl and 15% EDTA. When SAEW was used for 1 min under ultrasonic vibration, no decreases in the hardness of dentin inside the root canal were detected.

Section snippets

Subject Teeth

The coronal area of 43 freshly extracted teeth with a single tooth root and single canal preserved in physiological saline was removed at the enamel-cemental junction using diamond disc (Shofu Co., Kyoto, Japan).

Irrigants

Distilled water, 5.25% sodium hypochlorite (Kishida Chemical Co., Kyoto, Japan), 3% hydrogen peroxide (Nikko Pharmaceutical Co., Gifu, Japan), SAEW produced using a SAEW production apparatus (Alfa Light; Amano Co., Yokohama, Japan), and Morhonine (14.3% EDTA solution) (Showa Yakuhin

SEM Observation

Experimental Results are Shown in Figs. 2AE.

Group 1: 5.25% NaOCl + 3% H2O2

This group showed no effects on smear layer removal, in that smear layers were observed on the entire wall of the root canal in all specimens.

Group 2: 5.25% NaOCl + SAEW (1 Minute Ultrasonic)

SAEW was used with 1 minute of ultrasonic irrigation in this group, and smear layers in the central and apical one-third areas of the tooth root canal were almost completely removed. Furthermore, clear images of the marginal outline of dentinal tubule orifices were more frequently observed than unclear images

Discussion

In this study a comparison was made of the cleaning effectiveness of irrigation with SAEW, EDTA, H2O2, and NaOCl. It has been shown by many investigators that NaOCl and H2O2 are the most widely used irrigating solutions in endodontics. Sodium hypochlorite (NaOCl) is an effective antimicrobial agent, serves as a lubricant during instrumentation, which can dissolve vital and nonvital tissue (1, 2, 3). The bubbing of hydrogen peroxide (H2O2) when in contact with tissue and the liberation of oxygen

Conclusion

After root canal enlargement and preparation of fresh extracted teeth, the tooth root canals were irrigated using various types of root canal irrigants, and the specimens were compared using SEM and micro-hardness test. The following results were obtained:

  • 1

    Under ultrasonic vibration, root cleaning effects of the combined use of SAEW and NaOCl solution as root canal irrigants were equivalent to those in the group with NaOCl and 15% EDTA.

  • 2

    When SAEW was used as a root canal irrigant for 1 min under

References (34)

Cited by (0)

View full text