Using Cone Beam Computed Tomography and Fractal Dimension Analysis of Periapical Radiographs for Quantification of Vertical Root Fracture and the Changes of Periapical Lesion
Date Issued
2014
Date
2014
Author(s)
Huang, Chih-Chia
Abstract
When the teeth vertical root fracture occurs, it cause damage the surrounding periodontal ligament and alveolar bone resorption quickly. The dentist can not make a correct diagnosis from immediately from these diverse symptoms and no obvious evidence of the image. The purpose of the experiment through medical imaging methods such as fractal dimension in the periapical radiography help dentists diagnose vertical root fracture. Then we used different cone -beam computed tomography with different resolution and find out the width of fracture space of vertical root fracture teeth. Thus dentists realise to choose the proper resolution dental computed tomography to diagnosis vertical root fracture.
It was found that the variable width of fracture space between each vertical root fracture teeth. Although some teeth the width of fracture vrthere are over than 200μm or less than 20μm, but more than half of fracture teeth the maximum width larger than 100μm. If the premolar occurred vertical root fracture, the width of fracture space over 100μm company with the fracture line extending to apical 3mm or two fractur line exist in the same root. We also test fractal dimension method in the successful and failure endodontic treatment teeth. The fractal dimension increased in the successful endodontic tx teeth of root apex bone and the failure tx teeth of the border of reaction bone. The fractal dimension decreased in the country in the failure endodontic tx teeth of root apex bone and thesuccessful tx teeth of the border of reaction bone. We have found that fractal dimension values were decreasing trend from four regions of interesting area around the root surrounding alveolar bone although without statistically significant change from two periapical radiiography.
The dentists know how to choise dental computed tomography to diagnosis of vertical root fracture teerth through this experiment. We may usd fractal dimension method to help diagnosis vertical root fracture from periapical radiography in the future.
Subjects
垂直牙根斷裂
碎形維度值
牙科電腦斷層攝影
微型電腦斷層攝影
Type
thesis
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