Influence of light source, polarization, education, and training on shade matching quality.

STATEMENT OF PROBLEM Many factors influence the quality of shade selection, and isolating how significantly each of these factors influences results is difficult. PURPOSE The purpose of this in vitro study was to compare results of shade matching using handheld lights with or without a polarizing filter with results obtained using a professional viewing booth and to analyze the influence of education and training on shade selection outcome. MATERIAL AND METHODS A total of 96 third-year dental students (evaluators) were randomly separated into 4 groups. Each group was assigned 1 of 2 handheld shade-matching devices (lights) with or without a polarizing filter. Each group performed a shade matching exercise using the handheld light or a professional viewing booth. The exercise consisted of matching shade tabs placed in a typodont to a commercial shade guide. Each group repeated this procedure 4 times over a 9-week period. A lecture on shade matching was presented at the fifth week of the study, between "before" and "after" shade matching procedures. RESULTS Shade matching scores with handheld lights (7.8) were higher than scores of shade matching with the viewing booth (7.2). The mean scores for before (7.2) and after (7.8) shade matching (with education and training in between) were significantly different. The combined effect of light and education and training improved the shade matching score by 1.2, from 6.8 in the before sessions using the viewing booth to 8.0 in the after sessions using handheld lights. A 21% increase in the number of evaluators who selected 1 of 4 best matches was recorded, 10% for handheld lights versus viewing booth after education and training versus before sessions and 11% between after sessions using handheld lights versus before sessions using viewing booth. CONCLUSIONS Within the limits of the study, the shade matching scores with handheld lights were significantly better than the results obtained using a viewing booth (P<.01). Using a handheld light with or without a polarizing filter did not influence shade matching results. Mean shade matching scores were significantly better after education and training (P<.01). Light combined with education and training resulted in the greatest increase in shade matching quality.

[1]  G. Reinelt,et al.  Colour compatibility between teeth and dental shade guides in Quinquagenarians and Septuagenarians. , 2009, Journal of oral rehabilitation.

[2]  R. Paravina.  Evaluation of a newly developed visual shade-matching apparatus. , 2002, The International journal of prosthodontics.

[3]  William M Johnston,et al.  Coverage error of three conceptually different shade guide systems to vital unrestored dentition. , 2007, The Journal of prosthetic dentistry.

[4]  William M. Johnston,et al.  Color acceptance of direct dental restorative materials by human observers , 2000 .

[5]  D. McMaugh.  A comparative analysis of the colour matching ability of dentists, dental students, and ceramic technicians. , 1977, Australian dental journal.

[6]  Mostafa Analoui,et al.  Designing visually optimal shade guides. , 2004, The Journal of prosthetic dentistry (Print).

[7]  John M. Powers,et al.  Optimization of tooth color and shade guide design , 2009 .

[8]  Ihab A Hammad,et al.  Intrarater repeatability of shade selections with two shade guides. , 2003, The Journal of prosthetic dentistry.

[9]  C. Goodacre,et al.  Teaching of color in predoctoral and postdoctoral dental education in 2009. , 2010, Journal of dentistry.

[10]  W D Culpepper,et al.  A comparative study of shade-matching procedures. , 1970, The Journal of prosthetic dentistry.

[11]  S R Okubo,et al.  Evaluation of visual and instrument shade matching. , 1998, The Journal of prosthetic dentistry.

[12]  Bao Long Tran,et al.  In vitro comparison of instrumental and visual tooth shade determination under different illuminants. , 2015, The Journal of prosthetic dentistry.

[13]  Alexander J Hassel,et al.  Clinical effect of different shade guide systems on the tooth shades of ceramic-veneered restorations. , 2005, The International journal of prosthodontics.

[14]  Stephen J Chu,et al.  Dental color matching instruments and systems. Review of clinical and research aspects. , 2010, Journal of dentistry.

[15]  C. Hämmerle,et al.  Visual and Spectrophotometric Shade Analysis of Human Teeth , 2002, Journal of dental research.

[16]  R J Goodkind,et al.  Teaching of color in predoctoral and postdoctoral dental education in 1988. , 1992, The Journal of prosthetic dentistry.

[17]  S. Winkler,et al.  Shade matching by dental students. , 2006, The Journal of oral implantology.

[18]  Nuray Capa,et al.  Evaluating factors that affect the shade-matching ability of dentists, dental staff members and laypeople. , 2010, Journal of the American Dental Association.

[19]  Gerwin Arnetzl,et al.  Does gender and experience influence shade matching quality? , 2009, Journal of dentistry.

[20]  Andrew Joiner,et al.  Tooth colour: a review of the literature. , 2004, Journal of dentistry.

[21]  Wencheng Wu,et al.  The CIEDE2000 color-difference formula: Implementation notes, supplementary test data, and mathematical observations , 2005 .

[22]  Avishai Sadan,et al.  Comparison of the shade matching ability of dental students using two light sources. , 2006, The Journal of prosthetic dentistry.

[23]  G. Polyzois,et al.  Effect of individual shades on reliability and validity of observers in colour matching. , 2004, The European journal of prosthodontics and restorative dentistry.

[24]  R. J. Goodkind,et al.  Shade color discrimination by men and women. , 1991, The Journal of prosthetic dentistry.

[25]  Jane D Brewer,et al.  Advances in color matching. , 2004, Dental clinics of North America.

[26]  Q. Li,et al.  In vivo spectroradiometric evaluation of colour matching errors among five shade guides. , 2009, Journal of oral rehabilitation.

[27]  Hidekazu Takahashi,et al.  Color difference thresholds in dentistry. , 2015, Journal of esthetic and restorative dentistry : official publication of the American Academy of Esthetic Dentistry ... [et al.].