scholarly journals Effect of Gender, Experience, and Value on Color Perception

2012 ◽  
Vol 37 (3) ◽  
pp. 228-233 ◽  
Author(s):  
ME Miranda
Keyword(s):  
Clinical Experience ◽  
Statistical Significance ◽  
Color Perception ◽  
Exact Tests ◽  
Shade Matching ◽  
Shade Selection

SUMMARY Statement of the Problem Precise shade matching can be one of the most difficult tasks for the dentist and some variables may influence the process of shade comparison. Purpose of the Study This study tested the differences in shade perception between genders, the influence of the observer's clinical experience, and the value of ceramics in correct shade selection. Material and Methods A total of 45 women and 54 men compared 16 pairs of ceramic disks according to shades. The χ2 and Fisher exact tests were used to analyze the results, adopting 5% as the level of statistical significance. An analysis of risk was also performed to evaluate the variables. Results The results indicated that there were statistical differences among gender, clinical experience, and shades in discriminating ceramics. Conclusions Men and observers with more clinical experience were more successful in discriminating shades, although darker shades were selected more correctly than the lighter ones.

scholarly journals Developing the Evidence Base for M-Learning in Undergraduate Radiology Education: Identifying Learner Preferences for Mobile Apps

2019 ◽  
Vol 70 (3) ◽  
pp. 320-326
Author(s):  
Kathryn E. Darras ◽  
Jeroen J. G. van Merriënboer ◽  
Matthew Toom ◽  
Nathan D. Roberson ◽  
Anique B. H. de Bruin ◽  
...  
Keyword(s):  
Medical Students ◽  
Clinical Experience ◽  
Mobile Apps ◽  
Statistical Significance ◽  
Image Interpretation ◽  
Evidence Base ◽  
Ease Of Use ◽  
Content Organization ◽  
Learner Preferences ◽  
Delivery Strategies

Purpose There is a lack of evidence for developing radiology mobile apps for medical students. This study identifies the characteristics which students perceive as most valuable to teaching radiology with mobile apps (m-learning). Methods An online anonymous survey was administered to second- to fourth-year medical students at a single institution. The survey, which was based on established theoretical framework, collected students' preferred content organization, content presentation, and delivery strategies. The Copeland method was used to rank student preferences and a 2-tailed t test was used to determine if student responses were related to their clinical experience, with statistical significance at P < .05. Results The response rate was 25.6% (163/635). For content organization, image interpretation (66.9%), imaging anatomy (61.3%), and common pathological conditions (50.3%) were selected as the most important. For content presentation, quizzes (49.1%) and case presentations (46.0%) were selected as the most useful. Students with clinical experience rated algorithms as more important ( P < .01) and quizzes as less important ( P = .03). For delivery strategies, ease of use (92.6%), navigation (90.8%), and gestural design (74.8%) were deemed the most applicable. Conclusion This study documents medical students' preferences for m-learning in radiology. Although learner preferences are not the only feature to consider in the development of educational technology, these provide the initial framework for radiologists wishing to develop and incorporate mobile apps into their teaching.

scholarly journals Effect of Clinical Experience on the Shade Matching Accuracy in Different Dental Occupational Groups

2018 ◽  
Vol 52 (2) ◽  
pp. 132-139 ◽  
Author(s):  
Žarko Udiljak ◽  
Davor Ileš ◽  
Dubravka Knezović Zlatarić ◽  
Robert Ćelić
Keyword(s):  
Clinical Experience ◽  
Matching Accuracy ◽  
Occupational Groups ◽  
Shade Matching

scholarly journals Comparison between Color Spaces of Vita Lumin Shade Guide with Natural Teeth in Bengaluru Population using Spectrocolorimeter: An in vivo Study

2017 ◽  
Vol 18 (8) ◽  
pp. 683-687
Author(s):  
Deepak Mehta ◽  
Nishant Gupta ◽  
Rohit M Shetty ◽  
Adarsh N Bhat ◽  
Gopalakrishna Srivatsa ◽  
...  
Keyword(s):  
Local Population ◽  
Color Space ◽  
Color Measurement ◽  
Color Spaces ◽  
B Values ◽  
Natural Teeth ◽  
Shade Matching ◽  
Shade Guide ◽  
Shade Selection

ABSTRACT Aim The aim of this study is to compare the color space of Vita Lumin shade guide (SG) with the natural teeth of the local population. Materials and methods A total of 100 maxillary central incisors (100 patients) were subjected to color measurement with a spectrocolorimeter. For each tooth, L*, a*, b* values were recorded. All the shade tabs of Vita Lumin SG were analyzed with a spectrocolorimeter to define the color space covered by the Vita Lumin SG. The L*a*b* values of natural teeth were plotted on separate scattered diagrams and compared. Results About two out of three attributes (luminance and blue spectrum) of the local population of Bengaluru displayed a broader range than those available in Vita Lumin SG. Conclusion The local population requires an SG with an extended range, covering a higher luminance spectrum and broader blue spectrum. Clinical significance Esthetic restorations require accurate shade matching with the adjacent natural teeth, SGs being the mean of shade selection and communication should be comparable to the natural teeth. How to cite this article Shetty RM, Bhat AN, Gupta N, Mehta D, Srivatsa G, Singh I. Comparison between Color Spaces of Vita Lumin Shade Guide with Natural Teeth in Bengaluru Population using Spectrocolorimeter: An in vivo Study. J Contemp Dent Pract 2017;18(8):683-687.

scholarly journals The efficacy of a homoeopathic complex (Nux moschata D6, Phosphoricum acidum D30, Helleborus niger D6, Opium D30) in management of excessive daytime sleepiness

2018 ◽  
Author(s):  
◽  
Nondumiso Shabangu
Keyword(s):  
Placebo Group ◽  
Treatment Group ◽  
Excessive Daytime Sleepiness ◽  
Daytime Sleepiness ◽  
Epworth Sleepiness Scale ◽  
Statistical Significance ◽  
Controlled Study ◽  
Exact Tests ◽  
Double Blind ◽  
Stanford Sleepiness Scale

Background : Excessive daytime sleepiness (EDS) is the inclination or compulsion to fall asleep whilst intending to stay awake; it is believed to negatively affect occupational and social functioning and may be a predisposition towards accidents (Hayley et al. 2014), low productivity and interpersonal problems (Fong et al. 2005). Excessive daytime sleepiness is one of the most common sleep-related symptoms and it affects an estimated 20% of the population (Pagel .2009). The causes of EDS are numerous and include intrinsic sleep disorders (e.g. narcolepsy, obstructive apnoea/ hypopnea syndrome, idiopathic hypersomnia), and extrinsic disorders (Banerjee et al. 2004). Sleep deprivation is probably the most common cause of excessive daytime sleepiness. This clinic trial intended to evaluate the effectiveness of a homoeopathic complex (Nux moschata D6, Phosphoricum acidum D30, Helliborus niger D6, Opium D30) in the management of EDS in terms of the Epworth Sleepiness Scale (Johns, 1991) and Stanford Sleepiness Scale (Hoddes et al. 1973). And this randomised, double-blind placebo controlled study also aimed to provide a safe and effective alternative therapy for EDS. Aim of the study : The objective of this study was to determine the efficacy of a homoeopathic complex (Nux moschata D6, Phosphoricum acidum D30, Helliborus niger D6, Opium D30) and placebo in the management of EDS in terms of the Epworth Sleepiness Scale (ESS) and the Stanford Sleepiness Scale (SSS). Materials and Methodology : A sample group of 35 participants was selected voluntarily to conduct the study on basis of the inclusion and exclusion criteria. The participants were than randomly divided into two groups; a treatment group consisting of 23 participants and a placebo group consisting of 12 participants. Each participant had to attend three consultations in total with the researcher over a period of four weeks at the Durban University of Technology (DUT) Homoeopathic Day Clinic. At the first consultation a comprehensive case history (appendix F) was taken and physical examination (appendix E) was performed by the researcher but no medication was handed at that point. At each consultation the participants with the help of the researcher completed the Epworth Sleepiness Scale (ESS), and the seven days’ baseline Stanford Sleepiness Scale (SSS) was handed to the participants at the first and second consultation which the participants completed without the help of the researcher throughout the trial till their last consultation. Results : Results from the two measuring tools were statistically analysed with SPSS version 24.0. the participant’s level of sleepiness improved in both the treatment group and the placebo group. Intra-group analyses of ESS means revealed that both groups improved significantly over time, intergroup ANOVA analysis however revealed no significant differences between the groups. Section analyses however using the Fisher’s Exact Tests did reveal statistically significant differences within certain variables at some points of the study. Intra-group analyses of SSS data revealed no statistically significant change in SSS scores over the three weeks in both the Homoeopathic Complex and the Placebo Groups, as well as the Inter-group Fischer’s Exact tests revealed no statistically significant differences between the groups. Conclusion : Barring a few exceptions described in Chapter 4 & 5 it can be concluded from the results of the study that statistically the Homoeopathic complex (Nux moschata D6, Phosphoricum acidum D30, Helliborus niger D6, Opium D30) was not superior to placebo in the treatment of EDS. The data shows that both the Homoeopathic Complex and the placebo interventions had a positive effect on EDS and were effective in improving the level of excessive daytime Sleepiness. Irrespective of the general lack of statistical significance between groups a closer analysis of the intragroup and inter-group data does reveal a trend suggesting clinical significance in support of the effectiveness of the homoeopathic complex in the treatment of EDS however this needs to be further explored and confirmed in subsequent studies.

Art and Science of Shade Matching

Dental Update ◽  
2020 ◽  
Vol 47 (3) ◽  
pp. 238-245
Author(s):  
Mariya Khalid ◽  
Mohammad Ali Chughtai
Keyword(s):  
Clinical Relevance ◽  
Sufficient Time ◽  
Art And Science ◽  
Crucial Step ◽  
Number Of Factors ◽  
Shade Matching ◽  
Shade Selection

Shade selection is an important step in restorative procedures. The objective of this step is to provide aesthetically pleasing restorations which blend in with the existing dentition of the patient. This article highlights clinical difficulties which may hinder proper shade selection and a number of factors causing these difficulties. For ease of understanding, these factors have been divided into four categories. These are factors related to the dentist, the shade matching environment, the material used for shade selection and the patient. Because shade selection is an important step, it is recommended that this step should be given sufficient time. A checklist and a form for shade selection have also been devised to avoid any oversights during shade selection. This will help improve dentist laboratory communication which can result in an improved and aesthetically pleasing restoration. CPD/Clinical Relevance: Shade selection is a crucial step in the process of fabricating an aesthetically pleasing restoration.

scholarly journals Novel Trends in Dental Color Match Using Different Shade Selection Methods: A Systematic Review and Meta-Analysis

Materials ◽  
2022 ◽  
Vol 15 (2) ◽  
pp. 468
Author(s):  
Louis Hardan ◽  
Rim Bourgi ◽  
Carlos Enrique Cuevas-Suárez ◽  
Monika Lukomska-Szymanska ◽  
Ana Josefina Monjarás-Ávila ◽  
...  
Keyword(s):  
Systematic Review ◽  
Conventional Method ◽  
Global Analysis ◽  
Meta Analysis ◽  
Accurate Determination ◽  
Selection Methods ◽  
Color Match ◽  
Shade Matching ◽  
Shade Guide ◽  
Shade Selection

Since color matching is considered a subjective procedure, accurate shade choice is often the most challenging stage of recreating the natural appearance of teeth. Furthermore, accurate determination of tooth color is imperative for the final outcome of dental restorations. The purpose of this research is to assess the accuracy of color match between diverse shade selection methods throughout a systematic review and meta-analysis. Two independent investigators (L.H. and R.B.) screened the literature in five electronic databases. Randomized controlled trials or in vitro papers studying the effect of using either digital shade selection or visual shade selection on the accuracy of color match were included. A total of 13 manuscripts comprised the meta-analysis. Color difference (ΔE) between restorations where the shade matching was performed by the conventional method was greater than those where the shade matching was performed by computerized methods (p = 0.007). According to the subgroup analysis, only the use of digital photographs for shade matching showed a reduction in the (ΔE) (p < 0.0001), while the use of a spectrophotometer has no advantages over the use of visual shade guide tabs (p = 0.57). On the other hand, global analysis showed that incorrect shade matching was higher when the conventional method using shade guide tabs was used (p < 0.001), irrespective of whether a spectrophotometer or a digital camera was used (p < 0.001). This study concluded that the use of digital photography and spectrophotometric measurements led to fewer color differences and less incorrect shade matching than conventional methods using color shade tabs.

scholarly journals The axial load-share ratio in vivo as a supplemental assessment for the external fixator safe removal

2021 ◽  
Author(s):  
Yanshi Liu ◽  
Qiyu Jia ◽  
Feiyu Cai ◽  
Kai Liu ◽  
Xingpeng Zhang ◽  
...  
Keyword(s):  
External Fixation ◽  
Clinical Experience ◽  
External Fixator ◽  
Axial Load ◽  
Mechanical Test ◽  
Statistical Significance ◽  
Demographic Data ◽  
Ratio Test ◽  
Ilizarov External Fixator

Abstract Background: Timing the fixator removal is vital for a successful external fixation treatment. The purpose of this study was to determine the effectiveness of axial load-share ratio in vivo as a supplemental decision support tool for the safe removal of an Ilizarov external fixator.Methods: This prospective observational study consists of 83 patients undergoing tibial or femoral lengthening with Ilizarov circular external fixation in our institution, from January 2011 to October 2019. In group Ⅰ (38 patients), the external fixator was removed based on the surgeon’s clinical experience and radiographs from January 2011 to June 2015. In group Ⅱ (45 patients), from July 2015 to October 2019, the supplemental axial load-share (LS) ratio test was accomplished without the knowledge of the clinical results by another medical team. When the LS ratio < 10% was consistent with the conclusion (dense bone formation was achieved in the distraction zone) drawn from the corresponding routine radiographs by the treating surgeon, the external fixator was removed.Results: There was no statistical significance in demographic data between the two groups (P>0.05). In group Ⅰ, 4 of the 38 patients suffered refracture (the refracture rate was 10.5%) after fixator removal, and bone union was finally achieved with further intervention by intramedullary nail. In group Ⅱ, 36 patients terminated the external fixation after the first mechanical test, and another 9 patients terminated the external fixation at the subsequent test. None of the 45 patients in group Ⅱ suffered refracture (the refracture rate was 0%). There was statistical significance in the refracture rate between the two groups (P<0.05).Conclusions: Adequate assessment of bone regenerate is crucial before removing an external fixator to prevent deformation or refracture. The axial load-share ratio in vivo is a practically quantitative method to supplement radiography and clinical experience for the assessment of regenerate healing, and the axial load-share ratio dropped below 10% is a safe limit for the Ilizarov external fixator removal.

scholarly journals Shade Selection – Basic for Esthetic Dentistry: Literature Review

2020 ◽  
Vol 11 (09) ◽  
Author(s):  
Nimy Rajan ◽  
Rani Krishna S ◽  
Amy Rajan ◽  
Geetanjali Singh ◽  
Lucky Jindal
Keyword(s):  
Literature Review ◽  
Dental Treatment ◽  
Daily Practice ◽  
Shade Matching ◽  
Open The Doors ◽  
Esthetic Dentistry ◽  
Shade Selection ◽  
The Doors

Shade selection is one of the important aspect of esthetic dentistry. In present scenario patient seeks dental treatment under two situations: pain and esthetics. For esthetics every dentist should know the shade matching procedures. Shade matching includes knowledge of Color (hue, value and chroma), Translucency and opacity Gloss, Surface toughness, Opalescence, Iridescence, Fluorescence and Luminescence Phosphorescence and Metamerism. The aim of this article is to ‘open the doors of perception’ so that the entire dental team can comprehend and use color in daily practice and proper shade selection can be done to provide good esthetics to patient.

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