Modeling of tooth’s structure based on CT and μCT data — comparative study

Abstract

Visualization of the tooth’s inner structure is a key element during endodontic treatment. Most often two-dimensional (2D) X-ray pictures are used in clinical practice. However, there are many cases where three-dimensional (3D) modeling should be conducted to avoid misdiagnosis. Computer tomography (CT) can be considered as a tool for 3D imaging of the tooth’s structure. Accuracy of such visualization can raise doubts due to low resolution of CT-scanners comparing to the dimensions of root canals.

The aim of the research is to establish comparative analysis of the geometrical models of teeth, where accuracy of CT data would be verified on the basis of μCT data.

Three different teeth (molar with the C-shaped root canals, upper molar and canine tooth) were scanned in-vitro using Toshiba/Aquilion 16 Slice CT Scanner. The field of view was minimalized to 14,69 cm. The size of pixel was equal to 0,287 mm and the distance between particular slices was equal to 0,4 mm. The same teeth were subsequently scanned using SkyScan 1174 μCT apparatus. The size of pixel as well as the distance between slices was in the range of 0,025 – 0,027 mm. The CT data were processed using MIMICS software. Models of particular tooth obtained on the basis of CT data were compared to appropriate μCT models.

Some inaccuracy of tooth’s 3D reconstruction, made on the basis of CT-data, can be found. However, it is necessary to emphasize that such kind of diagnostics may in the foreseeable future become a very useful tool in dentistry. Advantages of 3D visualization as compared to the traditional X-ray picture are undeniable.