Digital image ratio: a new radiographic method for quantifying changes in alveolar bone. Part 1: theory and methodology

Jean, A.; Epelboin, Y.; Rimsky, Alexandre; Soyer, Alain; Ouhayoun, J.

doi:10.1111/j.1600-0765.1996.tb00479.x

Cited by 10 publications

(5 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The contrast curve of the film is another important parameter for the evaluation of the correlation between calcium mass changes and radiographic density changes. The contrast curve is not linear, but it is close to linear in the so-called diagnostic area of the film (34). The excellent linear correlations between the mean calcium mass per pixel and the corresponding radiographic density changes, which were found for each individual jaw in the present study (Table 2a-c), are the best proof that the quasi-linear diagnostic area of the film contrast curve was not left in the present study.…”

Section: Discussion Of the Methodssupporting

confidence: 51%

Accuracy of quantitative digital subtraction radiography for determining changes in calcium mass in mandibular bone: an in vitro study

Christgau

Hiller

Schmalz

et al. 1998

J of Periodontal Research

View full text Add to dashboard Cite

The aim of this in vitro study was to determine the accuracy of digital subtraction radiography (DSR) to detect small changes in calcium mass in alveolar bone adjacent to tooth roots. In each of 4 dried porcine mandible segments, one interproximal and one buccal “defect” region was defined adjacent to a premolar root. A series of cortical and cancellous bone slices with a 50 μm‐stepwise increasing thickness (0‐5000 μm) were attached to the mandible segments covering the respective “defect” region. Standardized radiographs were quantitatively assessed for density changes using DSR. After dissolving each bone slice in hydrochloric acid, its calcium concentration was photometrically determined. For each bone slice, the mean calcium mass covering a single pixel of the subtraction image was calculated. The Wilcoxon signed‐rank test and the Mann‐Whitney U‐test were used for statistical analysis (α = 0.05). A strong linear correlation (r2 = 0.86‐1.00; p ≤ 0.001) was found between the thickness of the bone slices and their calcium mass. Cortical bone showed a 3.5 times higher mean calcium mass/pixel than cancellous bone. Furthermore, a strong linear correlation (r2 = 0.63‐1.00; p ≤ 0.001) was found between the mean calcium mass per image pixel and the radiographic density changes. Neither the bone type nor the “defect” localization had a significant influence on radiographic density changes caused by changes in calcium mass. A change in mean calcium mass per image pixel of 0.1‐0.15 mg was necessary to be detected by DSR. In conclusion, this study revealed a high accuracy of DSR to detect small changes in calcium mass in alveolar cortical and cancellous bone.

show abstract

Section: Discussion Of the Methodssupporting

confidence: 51%

Accuracy of quantitative digital subtraction radiography for determining changes in calcium mass in mandibular bone: an in vitro study

Christgau

Hiller

Schmalz

et al. 1998

J of Periodontal Research

View full text Add to dashboard Cite

show abstract

“…Measurements obtained from the plaster sections represented both hard and soft tissue support and could not be individualized. However, findings from other studies, using complex radiographic methodologies, would suggest that postextraction tissue loss is predominantly due to alveolar resorption (12). Indeed, inclusion of gingival contour in our analysis may have actually masked the true extent of underlying bony atrophy as, in some cases, denture‐induced gingival hyperplasia was present.…”

Section: Discussionmentioning

confidence: 99%

Change in supporting tissue following loss of a permanent maxillary incisor in children

Rodd

Malhotra

O'Brien

et al. 2007

Dental Traumatology

View full text Add to dashboard Cite

Alveolar bone resorption is an inevitable consequence of tooth loss and may be detrimental to long-term dental aesthetics and function. The aim of the present study was to quantify the degree of tissue resorption following the loss of a permanent incisor in a young population. The study group comprised 11 boys and five girls who all required the extraction of a permanent maxillary central incisor due to trauma-related sequelae. Mean age at tooth loss was 10.8 years. Upper alginate impressions were taken at regular intervals following tooth loss and were cast in yellow dental stone. Study models were sectioned longitudinally through the mid-point of both the maxillary incisor socket and the contra-lateral incisor to provide a thin plaster section. Digital photographs were acquired of the edentulous (A1) and dentate (A2) surfaces of this section and image analysis software was employed to quantify the surface area of both A1 and A2. At 3 months postextraction, mean A1 was 15.7% less than mean A2. By 6 months mean A1 had further reduced and was 25.3% less than that of the corresponding dentate alveolus. However, at subsequent time intervals following tooth extraction (>6 months), tissue loss appeared to stabilise with an overall reduction in tissue area remaining at 22%. This reduction in supporting tissue area was found to be highly statistically significant (P = 0.002, anova). Furthermore, girls appeared to have an overall greater degree of tissue loss than boys (P = 0.015). Further research is indicated to explore factors influencing the degree of tissue loss following incisor extraction and the benefit of therapeutic interventions in limiting this resorption.

show abstract

“…Images were stored with the TIFF format. They were treated using Triton software, [16][17][18] which runs on a number of Unix workstations. Triton is an interactive program devoted to numerical image processing mainly based on Fourier filtering and wavelet analysis.…”

Section: Texture Analysismentioning

confidence: 99%

Scanning Electron Microscopic Evaluation of the Effects of an Air‐Abrasive System on Dental Implants: A Comparative In Vitro Study Between Machined and Plasma‐Sprayed Titanium Surfaces

Chairay

Boulekbache

Jean

et al. 1997

Journal of Periodontology

View full text Add to dashboard Cite

An in vitro comparative study was conducted in order to evaluate the effects of an air-abrasive system on dental implant surfaces. Eight new titanium dental implants, four standard machined implants (machined group), and four standard plasma-sprayed implants (plasma-sprayed group) were selected for investigation. Both neck and body surfaces of the implants were analyzed. Each pair of implants in each group was treated as follows: the spray of the air-abrasive unit was applied to each area for 5 seconds on the first implant and 15 seconds on the second implant. A total of 24 areas were observed: 16 test implants and 8 controls. Scanning electron photomicrographs were analyzed by 3 examiners using a category rating scale (kappa = 0.594). The images were also computerized for texture analysis. The results indicate that a single air-powder abrasive treatment of the dental implants selected for this study modified their exposed surfaces. After treatment, the threaded neck surface of a machined group implant was least affected, whereas the body was the most altered. In the plasma-sprayed group, comparisons between implant surfaces showed little change. In the machined group, more change was observed in both neck and body areas. In all specimens, a 5-second exposure to the air-powder abrasive did not induce deep changes in the surfaces. A 15-second exposure modified all the specimen surfaces. Further studies are needed to evaluate the effect of these changes on the biological osseointegration process.

show abstract

Digital image ratio: a new radiographic method for quantifying changes in alveolar bone. Part 1: theory and methodology

Cited by 10 publications

References 23 publications

Accuracy of quantitative digital subtraction radiography for determining changes in calcium mass in mandibular bone: an in vitro study

Accuracy of quantitative digital subtraction radiography for determining changes in calcium mass in mandibular bone: an in vitro study

Change in supporting tissue following loss of a permanent maxillary incisor in children

Scanning Electron Microscopic Evaluation of the Effects of an Air‐Abrasive System on Dental Implants: A Comparative In Vitro Study Between Machined and Plasma‐Sprayed Titanium Surfaces

Contact Info

Product

Resources

About