New parameters of the root canal curvature and their clinical significance
Date Issued
2008
Date
2008
Author(s)
Wu, Ming-Hsiu
Abstract
It is important for a dentist to diagnose the difficulty of root canal therapy quickly and definitely. In most situation, we usually use a pre-operative radiography as a guide and the difficulty of root canal therapy is propose to the root canal curvature. Although many methods about the root canal curvature were published, but they still had many disadvantages and been very complicated. The purpose of this study is to find new linear parameters to describe the root canal curvature instead of the complicated angular parameters.hirty human mandibular first molar which need root canal therapy were collected. First we use digital X-ray system (Digoraâ) to take pre-operation radiography and then determine the parameters of Günday technique. We also determine the same thirty teeth with the linear parameters of new technique. The resultant values were evaluated statistically using Pearson correlation. A new designed statistic bending test model were used to stimulate the root canal curvature. After analyzing the relationships between the linear and angular parameters, we can find a rule to define the root canal curvature with a new definition. Then the preparation sequence and the difficulty of root canal therapy can be defined. Finally we use finite element method to simulate the statistic bending test. he parameter Coronal Access Angle seems to be excrescent in Günday technique and can be replaced by the specific value X/Y. The previous angular parameter Schneider’s angle can be replaced by the specific values X/(Y+Z) and X/Y in new technique. The Weine’s angle can be replaced by X/(Y+Z) and X/Z. significant correlation was seen between the finite element method and the statistic bending test. We can use the finite element method to replace the complicated actual study and made it efficiently and economically.f we want to describe a root canal curvature with our new definition. We can use the special value X/(Y+Z) to show the generalized curvature. And then we use the value Y/(Y+Z) to define the most curved point is at what level in the whole canal (coronal, middle, or apical part?). Finally, if we want to describe the curvature definitely. We can use the value X/Y to describe the initial part of the curve and use the value X/Z to describe the posterior part of the curve.
Subjects
root canal curvature
linear parameter
finite element method
Schneider''s angle
Weine''s angle
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