Pixel gray measurement for the diagnosis of dental ankylosis in cone beam computed tomography images

Rege, Inara Carneiro Costa; Botelho, Tessa de Lucena; Martins, Allisson Filipe Lopes; Leles, Cláudio Rodrigues

doi:10.1016/j.oooo.2020.08.030

Cited by 9 publications

(10 citation statements)

References 20 publications

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“…A recent study has objectively quantified mean grey values of ankylosed regions of unerupted or partially erupted teeth in patients’ CBCT scans and observed higher grey values in ankylosed regions. 10 This finding reveals the potential ability of CBCT grey values for that diagnostic purpose; however, the mean grey values of the PDL space and adjacent hard tissues may be strongly influenced by slightly different positioning of the region of interest. Alternatively, another quantitative approach to visually interpret CBCT grey values is by plotting them against their corresponding spatial location (X-coordinate) to display a 2-dimensional graph, also referred to as a plot profile.…”

Section: Introductionmentioning

confidence: 81%

“… 8 Although absolute CBCT grey values, unlike CT-derived Hounsfield units, cannot be used for quantitative analysis of bone quality, they have demonstrated a strong linear correlation with the linear X-ray attenuation coefficient of tissues; accordingly, higher CBCT grey values can be expected from hard tissues and lower CBCT grey values can be expected from soft tissues. 9 10 11 12 …”

Section: Discussionmentioning

confidence: 99%

“…A previous clinical study has already found higher grey values in square regions of interest placed over regions of suspected ankylosis; however, because of the microscopic nature of the PDL space, associated with the fact that the outcome of a planar region of interest is an average of the grey values of multiple pixels, this method is susceptible to the proportion between hyperdense and hypodense structures and leaves room for further methods like the one proposed herein. 10 …”

Section: Discussionmentioning

confidence: 99%

“… 8 However, although it is not appropriate to assume specific physical features of the object of interest based on any given CBCT-derived grey value, a strong linear relationship between grey values and object density has been observed. 9 10 11 12 …”

Section: Introductionmentioning

confidence: 99%

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A novel method of objectively detecting tooth ankylosis using cone-beam computed tomography: A laboratory study

et al. 2023

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Purpose The aim of this study was to objectively detect simulated tooth ankylosis using a novel method involving cone-beam computed tomography (CBCT). Materials and Methods Tooth ankylosis was simulated in single-rooted human permanent teeth, and CBCT scans were acquired at different current levels (5, 6.3, and 8 mA) and voxel sizes (0.08, 0.125, and 0.2). In axial reconstructions, a line of interest was perpendicularly placed over the periodontal ligament space of 21 ankylosed and 21 non-ankylosed regions, and the CBCT grey values of all voxels along the line of interest were plotted against their corresponding X-coordinates through a line graph to generate a profile. The image contrast was increased by 30% and 60% and the profile assessment was repeated. The internal area of the resulting parabolas was obtained from all images and compared between ankylosed and non-ankylosed regions under different contrast enhancement conditions, voxel sizes, and mA levels using multi-way analysis of variance with the Tukey post hoc test (α=0.05). Results The internal area of the parabolas of all non-ankylosed regions was significantly higher than that of the ankylosed regions ( P <0.05). Contrast enhancement led to a significantly greater internal area of the parabolas of non-ankylosed regions ( P <0.05). Overall, voxel size and mA did not significantly influence the internal area of the parabolas ( P >0.05). Conclusion The proposed novel method revealed a relevant degree of applicability in the detection of simulated tooth ankylosis; increased image contrast led to greater detectability.

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Section: Introductionmentioning

confidence: 81%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A novel method of objectively detecting tooth ankylosis using cone-beam computed tomography: A laboratory study

et al. 2023

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“…A thorough understanding of GVs is very important for dentists, especially dentomaxillofacial radiologists, orthodontists and oral surgeons. In the literature, GVs obtained from CBCT images were studied for BD assessments of dental implants, the diagnosis of dental ankylosis, and the diagnosis and differentiation of pathological lesions ( 7 , 9 - 11 ). Although many factors affect the GV, many studies found linear correlations between GV and HU and concluded that the GVs are useful for BD assessment ( 12 - 14 ).…”

Section: Introductionmentioning

confidence: 99%

Gray value measurement for the evaluation of local alveolar bone density around impacted maxillary canine teeth using cone beam computed tomography

Seçgin

Karslioğlu²,

Ozemre³

et al. 2021

Med Oral

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Background To investigate whether any relationship between local alveolar bone density and maxillary canine impaction using gray values from cone beam computed tomography. Material and Methods The cone beam computed tomography images of 151 patients were retrospectively evaluated. Maxillary canine was defined as an impacted tooth when root formation was complete and the patient’s age older than 13 or the other side of the maxillary canine has completely erupted. Similarly, complete eruption was defined as the tooth in its expected occlusion and position. Using the cone beam computed tomography software, the region of interest which was 5 mm2 in area, was placed in the trabecular bone on cross sectional cone beam computed tomography images and the gray value measurements were recorded. After measuring the gray values of all the teeth, the images were grouped according to the field of view size. Comparison of the gray values of impacted and non-impacted teeth was made between images with the same field of view size. Results A total of 151 patients, 101 (66.9%) female and 50 (33.1%) male, were included in the study. The mean age of the patients was 24.94 ±13.9. In images with a 40X40 field of view, the gray values of the impacted canine teeth were higher than the gray values of the non-impacted ones and statistically significant difference was found between them ( p =0.003). However no statistically significant difference was found between the gray values of impacted and non-impacted canine teeth in 60x60 and 100x50 field of view ( p =0.197, p =0.170, respectively). Conclusions We suggest using the smallest field of view size when evaluating bone density using gray values from cone beam computed tomography images and we support the idea that the local increased bone density may influence on impaction. Key words: Cone-beam computed tomography, tooth, impacted, bone density, maxilla, image processing, computer-assisted.

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Is the efficacy of cone beam computed tomography in the diagnosis of tooth ankylosis influenced by dose reduction protocols?

Martins

Brasil

Santos

et al. 2023

Oral Surgery, Oral Medicine, Oral Pathology and Oral Radiology

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Pixel gray measurement for the diagnosis of dental ankylosis in cone beam computed tomography images

Cited by 9 publications

References 20 publications

A novel method of objectively detecting tooth ankylosis using cone-beam computed tomography: A laboratory study

A novel method of objectively detecting tooth ankylosis using cone-beam computed tomography: A laboratory study

Gray value measurement for the evaluation of local alveolar bone density around impacted maxillary canine teeth using cone beam computed tomography

Is the efficacy of cone beam computed tomography in the diagnosis of tooth ankylosis influenced by dose reduction protocols?

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