Wall shear stress effects of different endodontic irrigation techniques and systems

Narisa Goode, Sara Khan, Ashraf A. Eid, Li Na Niu, Johnny Gosier, Lisiane Ferreira Susin, David Henry Pashley, Franklin Chi Meng Tay

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

Objectives: This study examined débridement efficacy as a result of wall shear stresses created by different irrigant delivery/agitation techniques in an inaccessible recess of a curved root canal model. Methods: A reusable, curved canal cavity containing a simulated canal fin was milled into mirrored titanium blocks. Calcium hydroxide (Ca(OH)2) paste was used as debris and loaded into the canal fin. The titanium blocks were bolted together to provide a fluid-tight seal. Sodium hypochlorite was delivered at a previously-determined flow rate of 1 mL/min that produced either negligible or no irrigant extrusion pressure into the periapex for all the techniques examined. Nine irrigation delivery/agitation techniques were examined: NaviTip passive irrigation control, Max-i-Probe® side-vented needle passive irrigation, manual dynamic agitation (MDA) using non-fitting and well-fitting gutta-percha points, EndoActivator™ sonic agitation with medium and large points, VPro™ EndoSafe™ irrigation system, VPro™ StreamClean™ continuous ultrasonic irrigation and EndoVac apical negative pressure irrigation. Débridement efficacies were analysed with Kruskal-Wallis ANOVA and Dunn's multiple comparisons tests (α = 0.05). Results: EndoVac was the only technique that removed more than 99% calcium hydroxide debris from the canal fin at the predefined flow rate. This group was significantly different (p < 0.05) from the other groups that exhibited incomplete Ca(OH)2 removal. Conclusions: The ability of the EndoVac system to significantly clean more debris from a mechanically inaccessible recess of the model curved root canal may be caused by robust bubble formation during irrigant delivery, creating higher wall shear stresses by a two-phase air-liquid flow phenomenon that is well known in other industrial débridement systems.

Original languageEnglish (US)
Pages (from-to)636-641
Number of pages6
JournalJournal of Dentistry
Volume41
Issue number7
DOIs
StatePublished - Jul 1 2013

Fingerprint

Calcium Hydroxide
Dental Pulp Cavity
Endodontics
Titanium
Gutta-Percha
Pressure
Sodium Hypochlorite
Ointments
Ultrasonics
Needles
Analysis of Variance
Air

Keywords

  • Apical fluid pressure
  • Calcium hydroxide
  • Canal fin
  • Fluid flow rate
  • Sodium hypochlorite
  • Two-phase gas-liquid flow

ASJC Scopus subject areas

  • Dentistry(all)

Cite this

Wall shear stress effects of different endodontic irrigation techniques and systems. / Goode, Narisa; Khan, Sara; Eid, Ashraf A.; Niu, Li Na; Gosier, Johnny; Ferreira Susin, Lisiane; Pashley, David Henry; Tay, Franklin Chi Meng.

In: Journal of Dentistry, Vol. 41, No. 7, 01.07.2013, p. 636-641.

Research output: Contribution to journalArticle

Goode, N, Khan, S, Eid, AA, Niu, LN, Gosier, J, Ferreira Susin, L, Pashley, DH & Tay, FCM 2013, 'Wall shear stress effects of different endodontic irrigation techniques and systems', Journal of Dentistry, vol. 41, no. 7, pp. 636-641. https://doi.org/10.1016/j.jdent.2013.04.007
Goode, Narisa ; Khan, Sara ; Eid, Ashraf A. ; Niu, Li Na ; Gosier, Johnny ; Ferreira Susin, Lisiane ; Pashley, David Henry ; Tay, Franklin Chi Meng. / Wall shear stress effects of different endodontic irrigation techniques and systems. In: Journal of Dentistry. 2013 ; Vol. 41, No. 7. pp. 636-641.
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AU - Goode, Narisa

AU - Khan, Sara

AU - Eid, Ashraf A.

AU - Niu, Li Na

AU - Gosier, Johnny

AU - Ferreira Susin, Lisiane

AU - Pashley, David Henry

AU - Tay, Franklin Chi Meng

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AB - Objectives: This study examined débridement efficacy as a result of wall shear stresses created by different irrigant delivery/agitation techniques in an inaccessible recess of a curved root canal model. Methods: A reusable, curved canal cavity containing a simulated canal fin was milled into mirrored titanium blocks. Calcium hydroxide (Ca(OH)2) paste was used as debris and loaded into the canal fin. The titanium blocks were bolted together to provide a fluid-tight seal. Sodium hypochlorite was delivered at a previously-determined flow rate of 1 mL/min that produced either negligible or no irrigant extrusion pressure into the periapex for all the techniques examined. Nine irrigation delivery/agitation techniques were examined: NaviTip passive irrigation control, Max-i-Probe® side-vented needle passive irrigation, manual dynamic agitation (MDA) using non-fitting and well-fitting gutta-percha points, EndoActivator™ sonic agitation with medium and large points, VPro™ EndoSafe™ irrigation system, VPro™ StreamClean™ continuous ultrasonic irrigation and EndoVac apical negative pressure irrigation. Débridement efficacies were analysed with Kruskal-Wallis ANOVA and Dunn's multiple comparisons tests (α = 0.05). Results: EndoVac was the only technique that removed more than 99% calcium hydroxide debris from the canal fin at the predefined flow rate. This group was significantly different (p < 0.05) from the other groups that exhibited incomplete Ca(OH)2 removal. Conclusions: The ability of the EndoVac system to significantly clean more debris from a mechanically inaccessible recess of the model curved root canal may be caused by robust bubble formation during irrigant delivery, creating higher wall shear stresses by a two-phase air-liquid flow phenomenon that is well known in other industrial débridement systems.

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KW - Sodium hypochlorite

KW - Two-phase gas-liquid flow

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