title: Light transmittance by a multi-coloured zirconia material.
abstract: Full-contour zirconia restorations are gaining in popularity. Highly translucent zirconia materials and multi-coloured zirconia blocks might help to overcome the aesthetic drawbacks of traditional zirconia. This study evaluated the transmittance of visible light (400-700 nm) through the four different layers (Enamel Layer EL, Transition Layer 1 TL1, Transition Layer 2 TL2, Body Layer BL) of a multi-coloured zirconia block (KATANA™ Zirconia Multi-Layered Disc (ML)) using a spectrophotometer. Forty specimens (thickness of 1±0.05 mm) from each layer were examined and statistically evaluated at a confidence-level of 5%. Light transmittance was expressed as a percentage of the through-passing light. The following mean values (SD) were found: EL 32.8% (1.5), TL1 31.2% (1.3), TL2 25.4% (1.3) and BL 21.7% (1.1). Significant differences were found between all groups (ANOVA, Student-Newman-Keuls). This multi-coloured zirconia block showed four layers with different light transmittance capabilities. It might therefore be useful for enhancing the aesthetic appearance of full-contour zirconia restorations made from this material.
authors.affiliation: Comprehensive Dental Care, Oral Implant Center, Niigata Hospital, Nippon Dental University.
authors.forename: Kazuhiko
authors.initials: K
authors.lastname: Ueda
authors.forename: Jan-Frederik
authors.initials: JF
authors.lastname: Güth
authors.forename: Kurt
authors.initials: K
authors.lastname: Erdelt
authors.forename: Michael
authors.initials: M
authors.lastname: Stimmelmayr
authors.forename: Heinrich
authors.initials: H
authors.lastname: Kappert
authors.forename: Florian
authors.initials: F
authors.lastname: Beuer
mesh_terms: D003116:Color; D003776:Dental Porcelain / Q000737:chemistry; D008027:Light; D008422:Materials Testing; D013053:Spectrophotometry; D013499:Surface Properties; D015040:Zirconium / Q000737:chemistry*
chemical_list: D003776:Dental Porcelain; D015040:Zirconium; C028541:zirconium oxide