Statement of problem

Whether the amount of the endodontic obturation material remnants in a root canal prepared for a post is related to variations in the anatomic shape of the canal or whether it varies in different parts of the post space is unclear.

Purpose

The purpose of this in vitro study was to estimate the extent of root canal contamination with remnants of the obturation material after post space preparation in relation to the anatomic shape of the root canals by means of microcomputed tomography.

Material and methods

Fifty freshly extracted teeth were divided into 5 test groups with respect to the root anatomy of different tooth types. The root canals were shaped and obturated with gutta percha. The space for the glass fiber post was prepared with standardized drills, and all specimens were scanned by microcomputed tomography. The areas of residual obturation material on the root canal walls in the coronal and apical parts of the prepared post space were estimated by using a 3D visualization software program. Parametric and nonparametric dispersive analysis (analysis of variance and Kruskal-Wallis) and Wilcoxon tests were used for statistical data evaluation (α=.05).

Results

The estimates of the root canal surface areas contaminated with residual obturation material after post space preparation were significantly larger in premolars (P≤.01), as compared with mandibular incisors and with the palatal roots of maxillary first molars. The contamination areas in different parts of the root canal (apical and coronal) reported significant differences within and between the test groups.

Conclusions

The extent of root canal contamination with remnants of endodontic obturation material after post space preparation was related to the anatomic shape of the roots and varied in the coronal and apical parts of the prepared post space.

中文翻译：

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后间隙准备后不同根管解剖牙齿中根管充填材料残留污染的显微计算机断层扫描评估

问题陈述

为桩准备的根管内残留的牙髓充填材料的数量是否与根管解剖形状的变化有关，或者是否在桩空间的不同部位有所不同，目前尚不清楚。

目的

这项体外研究的目的是通过显微计算机断层扫描评估与根管解剖形状相关的后间隙准备后充填材料残留物对根管的污染程度。

材料与方法

50颗新拔牙根据不同牙型的牙根解剖分为5个测试组。根管成形并用牙胶封闭。用标准钻头准备玻璃纤维桩的空间，并通过微计算机断层扫描术扫描所有标本。通过使用 3D 可视化软件程序估计准备好的桩空间的冠状和根尖部分的根管壁上残留的封闭材料的面积。参数和非参数分散分析（方差分析和 Kruskal-Wallis）和 Wilcoxon 检验用于统计数据评估 (α=.05)。

结果

与下颌切牙和上颌第一磨牙的腭根相比，后间隙制备后残留的封闭材料污染的根管表面积的估计值在前磨牙中显着较大（P ≤ .01）。根管不同部位（根尖和冠状）的污染区域在测试组内和测试组之间报告了显着差异。

结论

后间隙准备后根管充填残留物对根管的污染程度与根的解剖形状有关，并且在预备后间隙的冠状和根尖部分有所不同。