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Numerical investigation of root canal irrigation adopting innovative needles with dimple and protrusion

Li P., Zhang D., Xie Y., Lan J.

Acta of Bioengineering and Biomechanics

2013

Vol. 15, no. 1

43--50

As important passive flow control methods, dimples and protrusions have been successfully implemented via geometric modifications to manipulate flow fields to get a desired flow parameters enhancement. In this research, two novel needles were proposed based on a prototype by means of the dimple and protrusion, and flow patterns within a root canal during final irrigation with these needles were numerically investigated. The calculation cases consistent with the clinically realistic irrigant flow rates, which are 0.02, 0.16 and 0.26 mL s–1 are marked as case A, B and C, respectively. The characteristic parameters to estimate irrigation efficiency, such as shearing effect, mean apical pressure, irrigation replacement and fluid agitation, were compared and the optimal geometry in every calculation case was obtained. As shown from the results, flow rates and needle geometries were the causes of irrigation parameters variations. The sum of shear stress, irrigation replacement and fluid agitation were equal in the low flow rate case A, however, the needle with a protrusion on its tip had advantages in the three irrigation characteristic parameters above in calculation case B, and the needle with a dimple on its tip had advantages in calculation case C. Furthermore, the needles proposed did not give rise to the risk of irrigant extrusion. These needles can be better choices at larger flow rates. Therefore, needle geometry optimizations utilizing passive flow control methods are worthy to be investigated in the root canal irrigation enhancement.

Reconstruction of the root canal axis from two orthographic projections

Szabó J., Ledeczky G., Sulyok P., Dabó Cs. N.

Zeszyty Naukowe. Geometria i Grafika Inżynierska / Politechnika Śląska

1998

z. 2

5-14

We take part in a joint research with dentists where we want to describe and classify the root canal of the human teeth. Every root canal has its own individual from. The knowledge of root canal form is important requirement for successfull dental treatment. The aim of this paper is to show a practical procedure. In terms of mathematics the root canal axis is a space curve. In this procedure we reconstruct this curve in space from its orthographic projections. This paper gives all exact steps of this procedure.

W pracy podjęto próbę zdefiniowania i skalsyfikowania kształtu kanału zębowego, posługując się takimi jego dwoma rzutami "prostokątnymi", które wyprowadzono z dwóch rzutów środkowych na dwie rzutnie. Odtworzoną z rzutów oś kanału aproksymowano krzywą rzędu czwartego.