Three-dimensional analysis of alveolar bone resorption by image processing of 3-D dental CT images

Abstract

We have developed a novel system that provides total support for assessment of alveolar bone resorption, caused by periodontitis, based on three-dimensional (3-D) dental CT images. In spite of the difficulty in perceiving the complex 3-D shape of resorption, dentists assessing resorption location and severity have been relying on two-dimensional radiography and probing, which merely provides one-dimensional information (depth) about resorption shape. However, there has been little work on assisting assessment of the disease by 3-D image processing and visualization techniques. This work provides quantitative evaluation results and figures for our system that measures the three-dimensional shape and spread of resorption. It has the following functions: (1) measures the depth of resorption by virtually simulating probing in the 3-D CT images, taking advantage of image processing of not suffering obstruction by teeth on the inter-proximal sides and much smaller measurement intervals than the conventional examination; (2) visualizes the disposition of the depth by movies and graphs; (3) produces a quantitative index and intuitive visual representation of the spread of resorption in the inter-radicular region in terms of area; and (4) calculates the volume of resorption as another severity index in the inter-radicular region and the region outside it. Experimental results in two cases of 3-D dental CT images and a comparison of the results with the clinical examination results and experts' measurements of the corresponding patients confirmed that the proposed system gives satisfying results, including 0.1 to 0.6 mm of resorption measurement (probing) error and fairly intuitive presentation of measurement and calculation results.

Cone Beam Computed Tomography (CBCT) in Periodontal Diseases: A Systematic Review Based on the Efficacy Model

“…Accordingly, it was found that CBCT is quite beneficial and accurate in the diagnosis of infra-bony defects and furcation involvement. [80] Walter et al 2009 [86] Pajnigara et al 2016 [87] Grimrad et al2009 [92] Walter et al 2010 [77] Gupta V et al 2014 [90] De Faria et al2012 [71] Gupta SJ et al 2014 [90] Fiejo et al 2012 [72] Khosropana et al2015 [91] Walter et al 2012 [82] Bhavsar et al [93] Raichur et al 2012 [84] Pajnigara et al 2017 [94] Marinescu et al 2013 [79] Dutra et al 2017 [89] Qiao et al 2013 [75] Nemoto et al 2018 [95] Haghgoo et al2014 [83] Banodkar et al 2015 [68] Cimbaljevic et al 2015 [69] Darby et al 2015 [70] Li F et al 2015 [74] Guo et al 2016 [73] Zhu et al 2016 [78] Suphanantachat et al 2017 [76] Padmanabhan et al 2017 [81] Zhang et al 2018 [85] Charlotte, NC, USA) operating at 70 kVp, 7 mA , and an exposure time corresponding to the exposed area, Clinical measurements Good Quality Not clear N/A Not applicable Table 4. CASP checklist for critical appraisal of randomized clinical trials studies…”

Cone beam computed tomography (CBCT) in periodontal diseases: a Systematic review based on the efficacy model

“…The results revealed eighteen studies [65,69,71,74,76,81,84,[86][87][88][89][90][91][92][93][94][95][96] on diagnostic accuracy. The QUADAS-2 assessment tool was used for quality assessment [34].…”

Cone Beam Computed Tomography (CBCT) in Periodontal Diseases: A Systematic Review Based on the Efficacy Model

“…The results revealed eighteen studies [68][69][70][71][72][73][74][75][76][77][78][79][80][81][82][83][84][85] on diagnostic accuracy. The QUADAS-2 assessment tool was used for quality assessment [38].…”