An Approach for a Mathematical Description of Human Root Canals by Means of Elementary Parameters

An Approach for a Mathematical Description of Human Root Canals by Means of Elementary Parameters
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一种利用基本参数对人体根管进行数学描述的方法

DOI:
10.1016/j.joen.2016.11.011
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发表时间:
2017
影响因子:
4.2
通讯作者:
Hannig
Hannig
中科院分区:
医学2区
文献类型:
--
作者:
Dannemann;Kucher;Kirsch;Binkowski;Modler;Hannig

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根管几何形状是根管预备和预备的重要因素。曲率、长度、形状和分支需要提前评估,以提高治疗的成功率。因此,本研究旨在设计并实现一种分析人类根管几何特征的方法。方法采用显微计算机层析成像技术对2颗拔除的人下磨牙进行咬合方向的x线摄影。采用自行实现的图像评价算法计算根管的三维几何形状,并采用椭圆模型、1圆模型和3圆模型3种不同的数学模型进行描述。结果不同的应用数学模型根据所采用的参数模型的不同,得到了相似的几何性质。对于更复杂的根管,由于对根管的适应性不同和对根管几何形状的逼近性较好,结果差异增大。结论采用本方法可以估计和比较天然根管的几何形状。因此,可以评估根管的偏差,这对选择根管器械的锥度很重要。椭圆模型能较好地逼近近椭圆截面的根管,而三圆模型能较好地逼近曲线形状的根管。
IntroductionRoot canal geometry is an important factor for instrumentation and preparation of the canals. Curvature, length, shape, and ramifications need to be evaluated in advance to enhance the success of the treatment. Therefore, the present study aimed to design and realize a method for analyzing the geometric characteristics of human root canals.MethodsTwo extracted human lower molars were radiographed in the occlusal direction using micro–computed tomographic imaging. The 3-dimensional geometry of the root canals, calculated by a self-implemented image evaluation algorithm, was described by 3 different mathematical models: the elliptical model, the 1-circle model, and the 3-circle model.ResultsThe different applied mathematical models obtained similar geometric properties depending on the parametric model used. Considering more complex root canals, the differences of the results increase because of the different adaptability and the better approximation of the geometry.ConclusionsWith the presented approach, it is possible to estimate and compare the geometry of natural root canals. Therefore, the deviation of the canal can be assessed, which is important for the choice of taper of root canal instruments. Root canals with a nearly elliptical cross section are reasonably approximated by the elliptical model, whereas the 3-circle model obtains a good agreement for curved shapes.
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发表时间: 2007
影响因子: 4.2
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与生物力学准备相关的根管口扩大。
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