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 language | English (US) |
|---|---|
| Pages (from-to) | 636-641 |
| Number of pages | 6 |
| Journal | Journal of Dentistry |
| Volume | 41 |
| Issue number | 7 |
| DOIs | |
| State | Published - Jul 1 2013 |
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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 journal › Article
}
TY - JOUR
T1 - Wall shear stress effects of different endodontic irrigation techniques and systems
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
PY - 2013/7/1
Y1 - 2013/7/1
N2 - 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.
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.
KW - Apical fluid pressure
KW - Calcium hydroxide
KW - Canal fin
KW - Fluid flow rate
KW - Sodium hypochlorite
KW - Two-phase gas-liquid flow
UR - http://www.scopus.com/inward/record.url?scp=84879418951&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84879418951&partnerID=8YFLogxK
U2 - 10.1016/j.jdent.2013.04.007
DO - 10.1016/j.jdent.2013.04.007
M3 - Article
VL - 41
SP - 636
EP - 641
JO - Journal of Dentistry
JF - Journal of Dentistry
SN - 0300-5712
IS - 7
ER -