Restor Dent Endod.  2021 Feb;46(1):e14. 10.5395/rde.2021.46.e14.

In vitro apical pressure created by 2 irrigation needles and a multisonic system in mandibular molars

• Ordinola-Zapata R
• Crepps JT
• Arias A
• Lin F

• KMID: 2548049
• DOI: http://doi.org/10.5395/rde.2021.46.e14

Abstract

Objectives
The aim of this study was to evaluate the apical pressure generated by 2 endodontic irrigation needles and the GentleWave system in mandibular molars.
Materials and Methods
The mesial and distal root canals of 12 mandibular molars were irrigated with a 30-gauge close-end needle or with a 30-gauge open-end needle. Procedures were performed in the mesial and distal canals. The GentleWave procedure and irrigation at 1 mm from the apex in the distal roots using an open-end needle were used, respectively, as negative and positive controls. The apical pressure was measured using a data acquisition pressure setup. Apical pressure exerted by the different needles in the 2 different canal types was statistically compared using 2-way analysis of variance.
Results
Significant differences were found in the apical pressure for both needles and the canal type. The lowest values were obtained with close-end needles and in mesial canals. Negative apical pressure values were obtained using GentleWave.
Conclusions
The needle and the canal type influenced the apical pressure. The GentleWave procedure produced negative apical pressure.

Keyword

Apical pressure; Irrigation needles; Irrigation technique

Figure

• 

  Figure 1 Representative apical pressures (mmHg) generated by the different methods. (A) Open-end needle, distal canal (top) and mesial canal (bottom); (B) Close-end needle, distal canal (top) and mesial canal (bottom); (C) Positive control (top), GentleWave procedure (bottom). Needle irrigation was recorded for a period of 30 seconds, GentleWave apical pressure was recorded for 60 seconds. The X axis represents time, and the Y axis represents pressure in mmHg. Moving average (orange), raw data (blue).

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