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An in vitro comparative study of intracanal fluid motion and wall shear stress induced by ultrasonic and polymer rotary finishing files in a simulated root canal model.

Koch J, Borg J, Mattson A, Olsen K, Bahcall J - ISRN Dent (2012)

Bottom Line: Particle movement in the fluid was captured using a high-speed digital camera and DaVis 7.1 software.A hot-wire was placed in an acrylic root canal and the canal was filled with distilled water.The ultrasonic and polymer rotary finishing files were separately tested in a static position and in a cyclical axial motion.

View Article: PubMed Central - PubMed

Affiliation: College of Engineering, Marquette University, Milwaukee, WI 53233, USA.

ABSTRACT
Objective. This in vitro study compared the flow pattern and shear stress of an irrigant induced by ultrasonic and polymer rotary finishing file activation in an acrylic root canal model. Flow visualization analysis was performed using an acrylic canal filled with a mixture of distilled water and rheoscopic fluid. The ultrasonic and polymer rotary finishing file were separately tested in the canal and activated in a static position and in a cyclical axial motion (up and down). Particle movement in the fluid was captured using a high-speed digital camera and DaVis 7.1 software. The fluid shear stress analysis was performed using hot film anemometry. A hot-wire was placed in an acrylic root canal and the canal was filled with distilled water. The ultrasonic and polymer rotary finishing files were separately tested in a static position and in a cyclical axial motion. Positive needle irrigation was also tested separately for fluid shear stress. The induced wall shear stress was measured using LabVIEW 8.0 software.

No MeSH data available.


Hot-film experimental model.
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Related In: Results  -  Collection


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fig2: Hot-film experimental model.

Mentions: The hot film experiment measured the fluid shear stress induced on the canal wall in one location. Two canal models similar to the one used in the flow visualization experiment were made out of epoxy with a 5 μm hot wire embedded so that the wire was flushed with the canal walls (Figure 2). One model was made with the wire oriented perpendicular to the canal to measure the axial stress, and the other model was made with the wire oriented parallel to the canal to measure the tangential stress. The wire was then attached to a Dantec MiniCTA 54T30 constant-temperature anemometer (CTA) which supplies a voltage to the wire in order to maintain a constant temperature. When the files were rotated or vibrated, they induced fluid motion which cooled the wire and caused an increase in the supplied voltage.


An in vitro comparative study of intracanal fluid motion and wall shear stress induced by ultrasonic and polymer rotary finishing files in a simulated root canal model.

Koch J, Borg J, Mattson A, Olsen K, Bahcall J - ISRN Dent (2012)

Hot-film experimental model.
© Copyright Policy - open-access
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC3313576&req=5

fig2: Hot-film experimental model.
Mentions: The hot film experiment measured the fluid shear stress induced on the canal wall in one location. Two canal models similar to the one used in the flow visualization experiment were made out of epoxy with a 5 μm hot wire embedded so that the wire was flushed with the canal walls (Figure 2). One model was made with the wire oriented perpendicular to the canal to measure the axial stress, and the other model was made with the wire oriented parallel to the canal to measure the tangential stress. The wire was then attached to a Dantec MiniCTA 54T30 constant-temperature anemometer (CTA) which supplies a voltage to the wire in order to maintain a constant temperature. When the files were rotated or vibrated, they induced fluid motion which cooled the wire and caused an increase in the supplied voltage.

Bottom Line: Particle movement in the fluid was captured using a high-speed digital camera and DaVis 7.1 software.A hot-wire was placed in an acrylic root canal and the canal was filled with distilled water.The ultrasonic and polymer rotary finishing files were separately tested in a static position and in a cyclical axial motion.

View Article: PubMed Central - PubMed

Affiliation: College of Engineering, Marquette University, Milwaukee, WI 53233, USA.

ABSTRACT
Objective. This in vitro study compared the flow pattern and shear stress of an irrigant induced by ultrasonic and polymer rotary finishing file activation in an acrylic root canal model. Flow visualization analysis was performed using an acrylic canal filled with a mixture of distilled water and rheoscopic fluid. The ultrasonic and polymer rotary finishing file were separately tested in the canal and activated in a static position and in a cyclical axial motion (up and down). Particle movement in the fluid was captured using a high-speed digital camera and DaVis 7.1 software. The fluid shear stress analysis was performed using hot film anemometry. A hot-wire was placed in an acrylic root canal and the canal was filled with distilled water. The ultrasonic and polymer rotary finishing files were separately tested in a static position and in a cyclical axial motion. Positive needle irrigation was also tested separately for fluid shear stress. The induced wall shear stress was measured using LabVIEW 8.0 software.

No MeSH data available.