Investigating the Effect of Different Metal Sheets on Reducing Radiation Behind Intraoral Digital Phosphor Plates During Intraoral Radiography using Gray Value

Purpose: To assess the efficacy of metal sheets with different thicknesses on reducing the radiation behind the photostimulable phosphor plate (PSP) during intraoral periapical examinations. Materials and Methods: In this study, a phantom head was used to investigate the effect of using metal sheets of aluminum, stainless steel, and copper with three thicknesses of 0.5, 0.75 and 1mm on reducing the radiation behind PSP. Images were acquired at 66 kVp 8 mA, and 0.16 s using the long-cone paralleling technique. The images were saved and exported to DICOM format without any post-processing. Then, they were transferred to an image processing software (Mimics, Materialize, Leuven, Belgium), and their mean gray values (MGV) were determined. The acquired data were statically analyzed for accessing the significant difference in groups means using ANOVA, and the means of groups were compared using Tukey’s test procedure. Results: The MGV of the second PSP differed significantly from those PSPs slotted with various metals (p<0.001). The MGV for lead and stainless steel at 0.5 mm thickness was insignificant (p = 0.852), but differed significantly from other metals. The MGV for PSPs with 0.75 mm stainless steel and 1 mm copper slots were varied significantly from those of all other PSP and metals. The 1 mm copper group was significantly different from all other groups (p<0.001). Conclusion: Using the mean gray value of the PSP, the use of various metal sheets of different thicknesses could effectively reduce the radiation behind the PSPs during periapical radiographs.

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Benefits of using a photostimulable phosphor plate protective device

Dentomaxillofacial Radiology ◽

10.1259/dmfr.20200339 ◽

2021 ◽

pp. 20200339

Author(s):

Graziela de Moura ◽

Mariana Boessio Vizzotto ◽

Priscila Fernanda da Silveira Tiecher ◽

Nádia Assein Arús ◽

Heraldo Luis Dias da Silveira

Keyword(s):

Image Quality ◽

Compressive Load ◽

Control Group ◽

Protective Device ◽

Photostimulable Phosphor ◽

Plate Size ◽

Phosphor Plate ◽

Photostimulable Phosphor Plate ◽

Post Hoc ◽

Gray Values

Objectives: To develop and test a protective device (PD) to increase the resistance of photostimulable storage phosphor (PSP) plate to compressive load, and assess the resulting image quality. Methods: Two prototypes, polyvinylchloride sheets of 0.3 mm and 0.7 mm each, were developed for PSP plate size 2. The resistance to compressive load was tested using eight new PSPs divided into four test groups: (1) PSP, (2) PSP and paperboard protector, (3) PSP and 0.3 mm PD, and (4) PSP and 0.7 mm PD. The resulting images were analyzed by three oral radiologists, based on the consensus for image artifacts. Additionally, the objective image quality test was performed with four new PSPs, using an 8-step wedge aluminum scale. The mean gray values and standard deviation were measured in a total of 240 images, and the data were analyzed using analysis of variance with Bonferroni post-hoc test. Results: Artifacts were seen in the PSP control group starting at 40 n, and at 150 n, 175 n and 300 n in 0.3 mm PD, paperboard protector and 0.7 mm PD, respectively. Although there was no statistical difference among groups, there were differences between exposure times (0.06–0.25 s, 0.06–0.40 s, and 0.10–0.40 s). Scanning resolution of 20 lp/mm showed higher mean gray value than 25 and 40 lp/mm (p < 0.05) Conclusion: The developed PDs improved the PSP resistance to compressive forces, with low interference on the pixel gray values, regardless of exposure time and spatial resolution. Nevertheless, the 0.7 mm PD could withstand the maximum compressive load.

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In vitro comparison of two photostimulable phosphor plate systems for early detection of occlusal dentin caries with and without a sharpening filter

Journal of Dental Research Dental Clinics Dental Prospects ◽

10.34172/joddd.2020.046 ◽

2020 ◽

Vol 14 (4) ◽

pp. 223-227

Author(s):

Roghieh Bardal ◽

Mahshid Mobini ◽

Matin Mirzaee

Keyword(s):

Statistical Significance ◽

Occlusal Caries ◽

Caries Diagnosis ◽

Dentin Caries ◽

Significant Difference ◽

Photostimulable Phosphor ◽

Phosphor Plate ◽

Photostimulable Phosphor Plate ◽

Sensitivity Specificity

Background. Dental caries is the most important reason for tooth loss. Clinical examination is the most commonly used technique for occlusal caries diagnosis. The diagnostic power of digital systems is a matter of controversy in this field. The present study aimed to determine the diagnostic accuracy of two photostimulable phosphor plate (PSP) systems for early occlusal dentin caries in vitro. Methods. Sixty-nine extracted molar and premolar teeth were used in this study. The teeth were mounted in triple blocks, and standard radiographs were taken by the Digora and Acteon digital radiographic systems. The original and filter 1-enhanced radiographs were evaluated by two experienced observers twice at an interval of two weeks, and dentin caries was recorded in Tables prepared for the study. The teeth were then sectioned in a buccolingual direction and evaluated under a stereomicroscope. The observers’ reports were compared with microscopic findings as the gold standard. SPSS 23 was used to calculate the kappa coefficient, sensitivity, specificity, and area under the ROC curve (AUC). Statistical significance was set at P<0.05. Results. The internal and the external agreements in both imaging systems were good to excellent. The means of sensitivity, specificity, and AUC in the Acteon system were 34.1, 92.9, and 0.674, with 30.8, 94.8, and 0.659, respectively, in the Digora system. Conclusion. The accuracy of early occlusal caries diagnosis was poor on both systems, and no significant difference was observed between the two systems at a 95% confidence interval. Although the AUC was slightly higher in the original images, there was no significant difference between them; however, due to their high specificity, they can prevent unnecessary treatments in the clinic.

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Analysis of the deterioration of photostimulable phosphor plates

Dentomaxillofacial Radiology ◽

10.1259/dmfr.20190500 ◽

2020 ◽

Vol 49 (6) ◽

pp. 20190500

Author(s):

Gustavo Nascimento de Souza-Pinto ◽

Gustavo Machado Santaella ◽

Amanda Achkar Coli ◽

Anne Caroline Oenning ◽

Francisco Haiter-Neto

Keyword(s):

Region Of Interest ◽

Objective Analysis ◽

X Rays ◽

X Ray ◽

Photostimulable Phosphor ◽

The Mean ◽

Phosphor Plates ◽

Gray Values

Objectives: To assess, objectively to determine the deterioration of the photostimulable phosphor plates (PSPs) after several acquisitions. Methods: Two new PSPs without preliminary use were exposed with an intraoral X-ray unit, and the EXPRESS® (Instrumentarium Imaging, Tuusula, Finland) unit was used for scanning of the PSPs. A 12-stepwedge aluminum scale were used superimposed with the PSPs during the X-rays exposures to perform the objective analyses. Objective analysis was carried out by mean gray values using the Image J software through a region of interest (ROI) of 0.1 × 0.1 mm, and the data were analyzed statistically using ANOVA. Results: For each, the Express® PSP a total of 1800 images were acquired during 60 days. The objective analysis showed loss of the mean gray values between the initial and final images. Besides, the percentage of mean gray values’ loss was between 0.7%, for the thickest step, and 8.4%, for the lowest thickness step. Conclusion: After many X-ray exposures of the Express® PSP a singular deterioration in the mean gray values could be observed.

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Dose reduction in general radiography for adult patients by use of a dual-side-reading photostimulable phosphor plate in a computed radiography system

Radiological Physics and Technology ◽

10.1007/s12194-014-0268-z ◽

2014 ◽

Vol 7 (2) ◽

pp. 310-315 ◽

Cited By ~ 1

Author(s):

Norisato Tsuda ◽

Nobukazu Tanaka ◽

Tsutomu Akasaka ◽

Hidetake Yabuuchi ◽

Junji Morishita

Keyword(s):

Dose Reduction ◽

Computed Radiography ◽

Adult Patients ◽

Radiography System ◽

Photostimulable Phosphor ◽

Phosphor Plate ◽

Photostimulable Phosphor Plate

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Reproducibility of pixel values for two photostimulable phosphor plates in consecutive standardized scannings

Brazilian Oral Research ◽

10.1590/s1806-83242006000300005 ◽

2006 ◽

Vol 20 (3) ◽

pp. 207-213 ◽

Cited By ~ 4

Author(s):

Patrícia Freitas ◽

Renato Yassutaka Faria Yaedú ◽

Izabel Regina Fischer Rubira-Bullen ◽

Maurício Escarpinati ◽

Marcelo Costa Vieira ◽

...

Keyword(s):

Digital Image ◽

X Rays ◽

X Ray ◽

Scanning Time ◽

Quantitative Studies ◽

Significant Difference ◽

Photostimulable Phosphor ◽

Phosphor Plates

The objective of the present study was to determine the reproducibility of the pixel values obtained with the Digora system (Soredex, Finland). Exposures were standardized, with variation in exposure and scanning time of two photostimulable phosphor plates containing a stepwedge image. The smallest variation in pixel values ranged from 50 to 75%, with the widest variations being observed in less dense steps. A significant difference in pixel values was observed in terms of X-ray exposure and scanning times and between the two plates themselves (ANOVA, p < 0.01). Using the present methodology, the reproducibility of pixel values was not satisfactory for the tested white photostimulable plates. This wide variation in digitalization might be influenced by the amount of X-rays that sensitized the plates. It may be important to establish the reproducibility of the pixel values in quantitative studies using digital image.

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Evaluation of a skin stapler for belt-loop gastropexy in dogs

Journal of the American Animal Hospital Association ◽

10.5326/15473317-35-5-440 ◽

1999 ◽

Vol 35 (5) ◽

pp. 440-444 ◽

Cited By ~ 15

Author(s):

BR Coolman ◽

S Manfra Marretta ◽

GJ Pijanowski ◽

SL Coolman

Keyword(s):

Tensile Strength ◽

Stainless Steel ◽

Clinical Evaluation ◽

New Method ◽

Maximum Tensile Strength ◽

Skin Staples ◽

Significant Difference ◽

The Mean

A new method for attachment of a belt-loop gastropexy using disposable, stainless steel skin staples was compared with a traditional hand-sewn belt-loop gastropexy technique in 24 fresh dog cadavers. Mean gastropexy times were 212 seconds for the stapled technique and 435 seconds for the hand-sewn technique. The stapled belt-loop gastropexy was significantly faster than the hand-sewn technique (P less than 0.001). There was no statistically significant difference in the mean maximum tensile strength between the two attachment methods. This study provides a basis for clinical evaluation of the stapled belt-loop gastropexy technique in dogs.

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Numerical Evaluation of Image Contrast for Thicker and Thinner Objects among Current Intraoral Digital Imaging Systems

BioMed Research International ◽

10.1155/2017/5215413 ◽

2017 ◽

Vol 2017 ◽

pp. 1-10 ◽

Cited By ~ 5

Author(s):

Oyunbat Dashpuntsag ◽

Midori Yoshida ◽

Ryosuke Kasai ◽

Naoki Maeda ◽

Hidehiko Hosoki ◽

...

Keyword(s):

Digital Imaging ◽

Imaging Systems ◽

Diagnostic Purpose ◽

Metallic Material ◽

Low Contrast ◽

Photostimulable Phosphor ◽

Phosphor Plate ◽

Digital Imaging Systems ◽

Photostimulable Phosphor Plate ◽

Small Bone

The purpose is to evaluate the performance of current intraoral digital detectors in detail using a precise phantom and new method. Two aluminum step wedges in 0.5 mm steps were exposed by two photostimulable phosphor plate (PSP) systems—one with automatic exposure compensation (AEC) and the other without AEC—and a CCD sensor. Images were obtained with 3 doses at 60 kV. The effect of metallic material also was evaluated. The contrast-to-noise ratio (CNR) for thinner steps and the low contrast value (LCV) for thicker steps were obtained. The CCD system was the best under all conditions (P<0.001), although the Gray value was sensitive to the dose, and the Gray value-dose relation varied greatly. The PSP system with AEC was superior to that without AEC for the LCV (P<0.001) but was inferior to it regarding the CNR (P<0.001). CNR and LCV in the PSP system without AEC were not affected by the metallic plate. Intraoral digital imaging systems should be chosen according to their diagnostic purpose. PSP system with AEC may be the best for detecting molar proximal caries, whereas the PSP system without AEC may be better for evaluating small bone regeneration in periodontal disease. The CCD system provided the best performance.

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Effects of different lingual retainers on periodontal health and stability

The Angle Orthodontist ◽

10.2319/110220-904.1 ◽

2021 ◽

Author(s):

Rabia Adanur-Atmaca ◽

Serpil Çokakoğlu ◽

Fırat Öztürk

Keyword(s):

Stainless Steel ◽

Computer Aided Design ◽

Steel Wire ◽

Mean Value ◽

Periodontal Health ◽

Anterior Teeth ◽

Significant Difference ◽

Computer Aided ◽

Group 3 ◽

The Mean

ABSTRACT Objectives To evaluate the effects of different lingual retainers on periodontal health and stability of mandibular anterior teeth at the 1-year follow-up. Materials and Methods One hundred thirty-two patients were randomly allocated to four groups using different lingual retainers: group 1, 0.016 × 0.022-in dead-soft wire; group 2, 0.0215-in 5-strand stainless steel wire; group 3, 0.014 × 0.014-in computer-aided design/computer-aided manufacturing nitinol retainer (Memotain); group 4, connected bonding pads. Plaque, gingival, and calculus indexes were used to evaluate periodontal health, and Little's irregularity index, intercanine width, and arch length measurements were performed to evaluate stability. All measurements were performed at each time point (debonding and 3, 6, 9, and 12 months). Results The mean value of the gingival index obtained in group 3 was lower than the mean value for all other groups. The mean value of the calculus index was the lowest in group 3, and there was a significant difference between group 3 and groups 1 and 2. No differences were found among the groups in terms of plaque index, intercanine width, and arch length. The least irregularity was obtained in groups 2 and 3. There were no significant differences between these groups and groups 1 and 4. Conclusions Gingival inflammation and calculus accumulation were the lowest in group 3 (Memotain). The irregularity for Memotain and stainless steel retainers was less than or the other groups. However, no clinically significant worsening of periodontal health or relapse were seen in any groups after 1 year.

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