			Home About us Contact

Radiographic Systems (radiographic + system)

Distribution by Scientific Domains

Medical Sciences	100%

Selected Abstracts

Comparison of apical transportation between ProFileÔ and ProTaperÔ NiTi rotary instruments

INTERNATIONAL ENDODONTIC JOURNAL, Issue 6 2004
M. K. Iqbal
Abstract Aim, To use a newly developed radiographic technique to compare apical transportation and loss of working length (WL) between .06 taper ProFileÔ Series 29 and ProTaperÔ nickel,titanium (NiTi) rotary instruments in vitro. Methodology, Mesio-buccal canals of 40 extracted mandibular molars were randomly divided into two groups. Group 1 was instrumented with ProFileÔ and group 2 with ProTaperÔ instruments according to the manufacturers' directions. A specially constructed radiographic jig with a Schick digital radiographic system (Schick Technologies Inc., Long Island City, NY, USA) was used to take pre- and postoperative radiographs of the samples at predetermined angulations. Using AutoCAD 2000 (Autodesk Inc., San Rafael, CA, USA), the central axes of initial and final instruments were radiographically superimposed to determine the loss of WL and degree of transportation at D0, D1, D2 and D4 from the WL. Data were analysed using repeated-measures anova. Results, A statistically significant difference in apical transportation was found at the D4 level between the two groups (P = 0.05). There was no statistical significance regarding postinstrumentation change in WL between groups. Spearman's Bivariate Correlation analysis indicated no statistically significant relationship between the radius of curvature and transportation. Conclusion, The results indicate that both ProTaperÔ and ProFileÔ instruments are comparable to each other in regards to their ability to optimally enlarge root canal with minimal transportation and loss of WL in vitro. [source]

Detection of marginal defects of composite restorations with conventional and digital radiographs

EUROPEAN JOURNAL OF ORAL SCIENCES, Issue 4 2002
Rainer Haak
The purpose of this study was to determine the validity of detecting approximal imperfections of composite fillings using three intraoral radiographic systems in vitro. Class II composite resin restorations (108) with three radiopacities (264, 306, 443% Al 99.5) of which 27 had marginal openings or overhangs, respectively, were conventionally (Ektaspeed plus) and digitally (Dexis, Digora) radiographed. Images were assessed by 10 observers for the presence of marginal gaps and overhangs, as well as for their need of restorative treatment according to a five-point confidence rating scale. The validity of the observations were expressed as areas under receiver operating characteristic (ROC) curves (Aroc). Repeated measures analysis of variance revealed significant effects of ,radiographic system' and ,diagnostic purpose'. Marginal overhangs (Aroc = 0.90) were significantly easier to diagnose than openings (Aroc = 0.63). Marginal gaps were better detected on conventional and Dexis radiographs than on Digora images. the range of sensitivities and specificities of the treatment decision was 0.53,0.56 and 0.87,0.88, respectively. It was concluded that the validity of detecting marginal defects of composite resin restorations based on radiographs was only slightly affected by the radiographic system being used. The diagnosis of marginal gaps frequently resulted in false-positive and false-negative decisions. [source]

Inter- and intra-observer reliability of radiographic scores commonly used for the evaluation of haemophilic arthropathy

HAEMOPHILIA, Issue 3 2008
M. SILVA
Summary., Although the severity of haemophilic arthropathy is commonly assessed using established radiographic scoring systems, there is limited available information about their inter- and intra-observer reliability. The purpose of the present study was to establish the inter-observer reliability (IEOR) and intra-observer reliability (IAOR) of three different methods available for the classification of haemophilic arthropathy, including the Arnold and Hilgartner classification, a modification to the Arnold and Hilgartner system described by Luck et al., and the classification described by Pettersson et al. Antero-posterior and lateral radiographs of 54 haemophilic joints were included for the analysis. To determine the IEOR for each one of the three radiographic systems, the radiographs were randomly evaluated by four observers, including two orthopaedic surgeons, one orthopaedic resident and one haematologist. For the determination of IAOR, all four reviewers repeated the assessment in a similar fashion, after a period of at least 2 weeks. IEOR and IAOR for the three classification systems was established using kappa (,) statistics. A Spearman rank correlation was used to determine the similarities between each reviewer's own interpretative scales. The IEOR was low for the Arnold and Hilgartner system (, = 0.35, P , 0.001) and the Luck system (, = 0.38, P , 0.001), but even lower for the Pettersson system (, = 0.06, P = 0.1). For the Pettersson system, particularly low , values were observed for the presence or absence of osteoporosis (, = 0.11, P = 0.0027), enlarged epiphysis (, = 0.10, P = 0.0039), erosion of joint margins (, = 0.11, P = 0.0018), and joint deformity (, = 0.16, P = 0.00001). However, a relatively high Spearman rank correlation for all three scales [rs = 0.75 (P < 0.001) for Arnold and Hilgartner system, rs = 0.74 (P < 0.001) for the Luck system and rs = 0.81 (P < 0.001) for Pettersson system] indicated an overall, general agreement among the reviewers with regard to the severity of the haemophilic arthropathy. There was a moderate IAOR value for both, the Arnold and Hilgartner system (, = 0.57, P = 0.00001) and the Luck system (, = 0.62, P = 0.00001) with a low IAOR value for the Pettersson system [, = 0.22, P = 0.00001). Currently available radiographic scoring systems for haemophilic arthropathy have low inter- and intra-observer reliability rates. Improvements, either through education or modification of the scoring systems, are critical in an era where correlations between clinical and radiographic scores have received significant attention. [source]