GSDM Operative Dentistry Resident Receives Prestigious Award
During the Society for Color and Appearance in Dentistry (SCAD) Annual Conference, held from October 12-14, 2017 in Newport Beach, California, one Henry M. Goldman School of Dental Medicine (GSDM) resident was presented with the SCAD VITA Excellence in Research Award. Dr. Abdullah Alnahdi, resident in the combined MSD & CAGS program in Operative Dentistry, was recognized for his research, titled, “Intra-Instrumental Reproducibility of Color Analysis in Dental Research.”
Dr. Alnahdi’s objective was to evaluate CIE L*a*b* color value reproducibility of three different instruments. Four different shade blocks of Vita Mark II: 1M1, 1M2, 2M3 and 4M2 in 1.5mm thickness over neutral gray background were used for color measurement. CIELAB: L*a*b* values were measured by Xrite i5 spectrophotometer, EasyShade advance 4.0, and Adobe Photoshop software. Five consecutive readings were recorded from both Spectrophotometer and Easyshade Advance 4.0 for each shade twice in two different days. Five pictures of specimens illuminated under light source D65 in X-rite Macbeth Judge II were taken by Canon EOS 550D with EF100mm Macro lens. Five random points in the middle of each sample from each picture were analyzed by Adobe Photoshop and color values recorded. Color deviation to average (ΔE) were calculated for each sample then each shade values were grouped and the average was recorded to compare among the measurement methods. L*a*b* values from each method were used to generate colors and evaluate if the produced color is similar or close to tooth colors or shade.
After analyzing his results, Dr. Alnahdi concluded that X-rite i5 Spectrophotometer has higher repeatability in color values analysis followed by EasyShade Advance 4.0 compared to Adobe Photoshop. There is a significant difference in color generation between values from X-rite i5 Spectrophotometer, Vita EasyShade Advance 4.0 and Adobe Photoshop of the same shade.
Dr. Alnahdi was mentored by Dr. Russell Giordano, Associate Professor in the Department of Restorative Sciences & Biomaterials and Director of Biomaterials, and Dr. Yuwei Fan, Research Assistant Professor. Other GSDM faculty in attendance at SCAD were Dr. Hideo Yamamoto, Clinical Professor in the Department of Restorative Sciences & Biomaterials; and Dr. Dan Nathanson, Professor & Chair of the Department of Restorative Sciences & Biomaterials as well as Past President of SCAD.
“Congratulations to Dr. Alnahdi for receiving the SCAD VITA Excellence in Research Award,” said Dean Jeffrey W. Hutter. “Boston University is proud to be a leading research institution, and Dr. Alnahdi’s work is helping continue our mission.”
The SCAD VITA Award for Excellence in Research Related to Color and Appearance in Esthetic Dentistry was established to promote young researchers. Three categories of applicants are eligible for the awards: predoctoral students, graduate students, and non-tenured junior faculty.