Accuracy of digital and film panoramic radiographs for assessment of position and morphology of mandibular third molars and prevalence of dental anomalies and pathologies

Benediktsdóttir, Ingibjörg S.; Hintze, H; Petersen, Jens; Wenzel, Ann

doi:10.1259/dmfr/15999089

Cited by 31 publications

(19 citation statements)

References 17 publications

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“…5 Panoramic radiography is usually the first radiographic method used to evaluate the location of the MC. [6][7][8][9] However, the information it provides is only two-dimensional and the images are distorted, often resulting in miscalculation of the location of the MC. planning, 4,10,11 and both have recently been replacing conventional panoramic radiographs.…”

Section: Introductionmentioning

confidence: 99%

Effects of exposure parameters and slice thickness on detecting clear and unclear mandibular canals using cone beam CT

Jasa

Shimizu

Okamura

et al. 2017

Dentomaxillofacial Radiology

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Objectives: The purpose of this study was to clarify the effects of exposure parameters and image-processing methods when using CBCT to detect clear and unclear mandibular canals (MCs). Methods: 24 dry half mandibles were divided into 2 groups with clear and unclear MCs based on a previous CBCT study. Mandibles were scanned using a CBCT system with varying exposure parameters (tube voltages 60 kV, 70 kV and 90 kV; and tube currents 2 mA, 5 mA, 10 mA and 15 mA) to obtain a total of 144 scans. The images were processed with different slice thicknesses using ImageJ software (National Institutes of Health, Bethesda, MD). Five radiologists evaluated the cross-sectional images of the first molar region to detect the MCs. The diagnostic accuracy of varying exposure parameters and image-processing conditions was compared with the area under the curve (Az) in receiver-operating characteristic analysis. Results:The Az values for clear MCs were higher than those for unclear MCs (p , 0.0001). With increasing exposure voltages and currents, Az values increased, but no significant differences were found with high voltages and currents in clear MCs (p 5 1.0000 and p 5 0.9340). The Az values of serial images were higher than those of overlaid images (p , 0.0001), and those for thicker slices were higher than those for thinner slices (p , 0.0001). Conclusions: Our findings indicate that detection of unclear MCs requires either higher exposure parameters or processing of the images with thicker slices. To detect clear MCs, lower exposure parameters can be used.

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Section: Introductionmentioning

confidence: 99%

Effects of exposure parameters and slice thickness on detecting clear and unclear mandibular canals using cone beam CT

Jasa

Shimizu

Okamura

et al. 2017

Dentomaxillofacial Radiology

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“…In the digital system, the film-based image is replaced by a two-dimensional array of pixels. There are several studies investigating on the accuracy and precision of digital panoramic radiographs and most of the reports concluded that the digital panoramic system was equally as useful as conventional film-based panoramic radiographs (4,5). However, it was also reported that panoramic radiography had limitations of distortion, superimposition with variability in inter-examiner agreement (6).…”

Section: Introductionmentioning

confidence: 99%

The evaluation of digital panoramic radiographs taken for implant dentistry in the daily practice

Park¹

2010

Med Oral

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Objectives: This study was conducted 1/ to find out the effects of anatomical sites and implant types on the magnification and 2/ to evaluate the inter-observer variability on the evaluation using the digital panoramas taken at daily practices. Study design: Panoramic radiographs from 156 patients treated with implants were evaluated by three observers. The length was measured on the lateral aspect of the implant in 1:1 mode using image measurement program and the percent magnification was calculated. The inter-observer correlation coefficient was measured to express inter-observer variability using reliability analysis-scale. Results: The average magnification factor in the panoramic radiograph was 126.8% in the vertical plane. Location within the anatomic arch showed different magnification by a minimum of 119.4% to a maximum of 130.8%. The measurements among three examiners were well correlated showing correlation coefficient of 0.81. The differences between one side and the contralateral side were evaluated and it was shown that the differences were observed only in maxillary anterior and maxillary premolar regions. Additionally, the external non-submerged group had the highest magnification value. Conclusions: It can be concluded that digital panoramic radiographs showed sufficient accuracy and good interexaminer agreement. The radiographic magnification of implant length may be influenced by anatomical sites and implant types.

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“…Previous studies have compared solid state sensors (2 systems, 52 and 93 teeth) and PSP systems (3 systems, 62, 104 and 77 teeth) with film for panorama imaging assessing third molars before removal and found that accuracy differed little for most of the variables evaluated, although two of the three PSP systems had significantly lower accuracy than film for assessing the relationship to the canal. 4 Those PSP systems were not included in the present study.…”

Section: Resultsmentioning

confidence: 99%

“…2 Digital receptors for panoramic imaging of the third molar have previously been evaluated (both chargecoupled device (CCD) sensors and photostimulable storage phosphor (PSP) plate systems) and it was concluded that five digital systems were equally useful for third molar treatment planning and had similar diagnostic accuracy. 3,4 One study, however, demonstrated that a CCD-based device was less accurate than PSP systems and film for diagnosing morphological changes in the temporomandibular joint (TMJ). 5 Previous studies using conventional film have evaluated scanograms for assessment of mandibular third molars and concluded that scanography was a useful method for evaluating the buccolingual relations between the mandibular canal and the roots of the molar.…”

Section: Introductionmentioning

confidence: 99%

Accuracy of scanography using storage phosphor plate systems and film for assessment of mandibular third molars

Matzen

Christensen

Wenzel

2011

Dentomaxillofacial Radiology

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Objectives: The aim of this study was to compare the diagnostic accuracy of two digital photostimulable storage phosphor (PSP) systems and film for assessment of mandibular third molars before surgery. Methods: 110 patients were referred to have both their mandibular third molars removed. Each patient underwent a radiographic examination with scanography using either Digora (Soredex, Helsinki, Finland) and film or VistaScan (Dü rr Dental, Beitigheim-Bissingen, Germany) and film in a randomized paired design. Two observers examined the following variables on the scanograms: bone coverage, angulation of the tooth in the bone, number of roots, root morphology and the relationship to the mandibular canal. In 75 of the pairs (Digora/film pair 5 38 and Vista/film pair 5 37) both third molars were eventually removed. During and after surgery the same variables were assessed, which served as reference standard for the radiographic assessments. The Wilcoxon signed-rank test tested differences in accuracy (radiographic compared with surgical findings) between Digora/film and between Vista/film. Results: There was no statistically significant difference between the diagnostic accuracy of film and either of the two digital receptors for assessment of mandibular third molars before surgery (P . 0.05), although Digora obtained a higher accuracy than film. Conclusions: Scanography is a valuable method for examination of mandibular third molars before removal and the PSP digital receptors in this study were equal to film for this purpose.

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Accuracy of digital and film panoramic radiographs for assessment of position and morphology of mandibular third molars and prevalence of dental anomalies and pathologies

Abstract: The five digital panoramic systems evaluated in this study were equally as useful for third molar treatment planning and diagnosis of dental anomalies and pathologies as conventional film-based panoramic radiographs.

Cited by 31 publications

References 17 publications

Effects of exposure parameters and slice thickness on detecting clear and unclear mandibular canals using cone beam CT

Effects of exposure parameters and slice thickness on detecting clear and unclear mandibular canals using cone beam CT

The evaluation of digital panoramic radiographs taken for implant dentistry in the daily practice

Accuracy of scanography using storage phosphor plate systems and film for assessment of mandibular third molars

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