Clinical evaluation of perceptibility of color differences between natural teeth and all-ceramic crowns |
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| Authors: | Shigemi Ishikawa-Nagai Aki Yoshida Maiko Sakai Joshua Kristiansen John D Da Silva |
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| Institution: | 1. Department of Restorative Dentistry and Biomaterials Sciences, Harvard School of Dental Medicine, Boston, MA, United States;2. Gnathos Dental Studio, Weston, MA, United States;3. Harvard School of Dental Medicine, Boston, MA, United States;4. Department of Oral Health Policy and Epidemiology, Harvard School of Dental Medicine, Boston, MA, United States;1. Department of Optics, Faculty of Science, University of Granada, Campus Fuente Nueva, Edificio Mecenas, s/n 18071, Granada, Spain;2. Houston Center for Biomaterials and Biomimetics, Department of Restorative Dentistry and Prosthodontics, University of Texas, School of Dentistry, 7500 Cambridge St., Houston, TX 77054, USA;3. Department of Restorative Dentistry and Prosthodontics, The University of Texas Dental Branch at Houston, 7500 Cambridge Dr., Ste. 5437, Houston, TX 77054, USA;4. Department of Computer Architecture and Computer Technology, E.T.S.I.I.T. University of Granada, s/n 18071, Granada, Spain;1. The Ohio State University, College of Dentistry, Division of Restorative, Prosthetic and Primary Care Dentistry, Columbus, OH, USA;2. Atatürk University, Faculty of Dentistry, Prosthodontics Department, Erzurum, Turkey;1. Department of Dental Materials Science, Academic Center for Dentistry Amsterdam, Amsterdam, The Netherlands;2. Department of Restorative Dentistry & Biomaterials Sciences, Harvard School of Dental Medicine, 188 Longwood Avenue, Boston, MA 02115, USA;3. Department of Reference and Education Services, Harvard Countway Library of Medicine, 10 Shattuck St., Boston, MA 02115, USA;1. Professor, Department of Prosthetic Dentistry, University of Atatürk Faculty of Dentistry, Erzurum, Turkey;2. Graduate student, Graduate Prosthodontics, Department of Prosthodontics, Faculty of Dentistry, University of Atatürk, Erzurum, Turkey;1. Visiting Assistant Professor, Department of Restorative Dentistry and Biomaterials Sciences, Harvard School of Dental Medicine; and Assistant Professor, Department of Prosthodontics, West China College of Stomatology, Sichuan University, Chengdu, China;2. Predoctoral student, Harvard School of Dental Medicine, Boston, Mass;3. Resident, Department of Oral Medicine, Infection, and Immunity, Harvard School of Dental Medicine, Boston, Mass;4. Resident, Department of Oral Medicine, Infection, and Immunity, Harvard School of Dental Medicine, Boston, Mass;5. Assistant Professor and Department Head, Department of Restorative Dentistry and Biomaterials Sciences, Harvard School of Dental Medicine, Boston, Mass;6. Assistant Professor, Department of Restorative Dentistry and Biomaterials Sciences, Harvard School of Dental Medicine, Boston, Mass |
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| Abstract: | ObjectivesColor matching still remains as one of the most challenging tasks in clinical dentistry. With the advancement of intraoral color matching instruments the importance of the development of color thresholds becomes increasingly important. The objective of this study was to set a gold standard for the color difference (ΔE) at which all-ceramic crowns cannot be distinguished from natural teeth.MethodAll-ceramic crowns with a zirconia coping (LAVA, 3M ESPE, St. Paul, MN, USA) and layered porcelain (Cerabien CZR, Noritake, Nagoya, Japan) fabricated to match contralateral maxillary central incisors were assessed by experienced observers. Eleven all-ceramic crowns (AC) were assessed as “excellent/perfect matches;” these crowns were then measured using a spectrophotometer and compared to their natural counterparts. Unrestored natural maxillary teeth (NT) were compared to unrestored contralateral teeth in 22 subjects. Six areas were measured in both groups to determine color differences (ΔE*).ResultsMean ΔE* value between the restorations and natural teeth was 1.6. Mean ΔE* between contralateral natural teeth was 0.9. Incisal areas of natural teeth exhibited greater differences in color than other compared areas.ConclusionA ΔE* = 1.6 represented the color difference that could not be detected by the human eye. |
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