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Year : 2012  |  Volume : 2  |  Issue : 2  |  Page : 426-429

Spectrophotometric analysis of color reproduction of 3 different thicknesses of 2 different commercial porcelains with a standard shade guide

1 Professor, Dept. of Prosthodontics, Sree Balaji Dental College and Hospital,Chennai, India
2 PG student, Dept. of Prosthodontics, Indira Gandhi Institute of Dental Sciences, Kothamangalam, Ernakulam, Kerala, India

Correspondence Address:
Dr. Narayana Reddy
Professor, Dept. of Prosthodontics, Sree Balaji Dental College and Hospital,Chennai
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Source of Support: None, Conflict of Interest: None

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Sixty metal-ceramic specimen were made with 3 different thickness of 1, 1.5 and 2 mm using nickel chromium metal backing and with ceramic veneer of two popular companies of VITA and IVOCLAR. The metal was made of 0.4 mm , opaque of 0.1mm and the ceramic dentin and enamel were the remaining 0.5,1 and1.5mm thickness respectively. The specimen were fabricated of A3 shade and compared with the A3 shade of VITAPAN shade guide using sprectrophotometer for the parameters of hue, value, chroma, a*value(red or green) and b*value (yellow or blue) Thicker specimen showed the hue closer to the shade tab compared to thinner specimen, with the IVOCLAR 2mm coming closest to the shade tab. The metal ceramic specimen were brighter than the shade tab but thinner 1mm specimen showed the brightness closest to the shade tab. The metal ceramic specimen showed higher chroma, redness and yellowness compared to the shade tab and the IVOCLAR 2mm specimen showed these values closer to the shade tab.

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