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J Endod. 2015 Nov;41(11):1884-7. doi: 10.1016/j.joen.2015.08.009. Epub 2015 Oct 1.

Effect of Intracanal Cryotherapy on Reducing Root Surface Temperature.

Author information

1
Department of Postgraduate Endodontics, University of Tlaxcala, Tlaxcala, Mexico; Private Practice, Puebla, Mexico. Electronic address: jveraro@yahoo.com.mx.
2
Department of Postgraduate Endodontics, University of Tlaxcala, Tlaxcala, Mexico; Private Practice, Jalapa, Mexico.
3
Department of Postgraduate Endodontics, University of Tlaxcala, Tlaxcala, Mexico; Private Practice, Tlaxcala, Mexico.
4
Private Practice, Puebla, Mexico; Department of Endodontics, Benemerita Universidad Autónoma de Puebla, Puebla, Mexico.
5
Department of Endodontics, Arthur A. Dugoni School of Dentistry, University of the Pacific, San Francisco, California.
6
Department of Endodontics, University of North Carolina School of Dentistry, Chapel Hill, North Carolina; Lebanese University Dental School, Beirut, Lebanon.

Abstract

INTRODUCTION:

The positive effect of cryotherapy has been widely described in medicine. The aim of the present study was to validate a new methodology to reduce and maintain external root surface temperature for at least 4 minutes.

METHODS:

Twenty extracted single-rooted teeth were instrumented to size 35/.06 and subjected to 2 different irrigation interventions with a repeated-measures design using 5% sodium hypochlorite first (control) and 2.5°C cold saline solution later (experimental). In both, 20 mL of the irrigant solution was delivered for a total time of 5 minutes with a microcannula attached to the EndoVac system (Kerr Endo, Orange County, CA) inserted to the working length. The initial and lowest temperatures were recorded in the apical 4 mm with a digital thermometer for both irrigants. Data were analyzed with the repeated measure analysis of variance (Greenhouse-Geisser correction) and Bonferroni post hoc tests. Differences in maintaining a -10°C temperature reduction over 4 minutes were assessed with the Fisher exact test.

RESULTS:

Although significant differences were found between the initial and lowest temperatures in both the control and experimental irrigation procedures (P < .001), the experimental intervention reduced it almost 10 times that of the control. When maintaining a -10°C temperature reduction over 4 minutes, the teeth in the experimental group also sustained significantly better results (P = 3.047 × 10(-10)).

CONCLUSIONS:

Using cold saline solution as the final irrigant reduced the external root surface temperature more than 10°C and maintained it for 4 minutes, which may be enough to produce a local anti-inflammatory effect in the periradicular tissues.

KEYWORDS:

Cryotherapy; EndoVac; negative pressure irrigation; temperature reduction

PMID:
26433855
DOI:
10.1016/j.joen.2015.08.009
[Indexed for MEDLINE]

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