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Article: Threshold Contrast Ratio and Masking Ability of Porcelain Veneers with High-Density Alumina Cores

TitleThreshold Contrast Ratio and Masking Ability of Porcelain Veneers with High-Density Alumina Cores
Authors
Issue Date2004
PublisherQuintessence Publishing Co, Inc. The Journal's web site is located at http://www.quintpub.com
Citation
International Journal Of Prosthodontics, 2004, v. 17 n. 1, p. 24-28 How to Cite?
AbstractPurpose: The purposes of this study were to: (1) investigate the correlation between the color difference of bilayer porcelain veneers over white and black backgrounds (ΔE1) and their opacity (contrast ratios); (2) determine whether there is a recommendable threshold contrast ratio above which the color difference is clinically acceptable (when ΔE ≤ 5); and (3) compare the ability of porcelain veneers to mask a color change from white to black backgrounds (ΔE1) and their ability to mask a color change from white to clinically discolored teeth (ΔE2). Materials and Methods: Forty-four maxillary anterior teeth of eight patients with severe tetracycline discoloration were prepared for bilayer porcelain veneers in shade A2 porcelain. The cores were 0.25 mm thick. The color (CIE L*a*b*) and reflectance (Y) of the midbuccal region of each veneer were measured over white and black backgrounds using a colorimeter under artificial daylight. The veneers were bonded to discolored teeth, and their color was measured after 1 week. Results: The mean color difference ΔE1 was 10.6 (SD 2.6). The mean contrast ratio was 0.75 (SD 0.1). There was a close and statistically significant correlation between ΔE1 and contrast ratio. The determined threshold contrast ratio was 0.91. The mean color difference ΔE2 was 11.6 (SD 5.5). A paired t test showed no difference between ΔE1 and ΔE2. Conclusion: There was a significant correlation between the masking ability of veneers (ΔE1) and their opacity (contrast ratio). There was no significant difference in the ability of the porcelain veneers in masking a color change from white to black backgrounds compared to their ability to mask the color change from white to the discolored teeth.
Persistent Identifierhttp://hdl.handle.net/10722/66819
ISSN
2015 Impact Factor: 1.487
2015 SCImago Journal Rankings: 0.539
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorChu, FCSen_HK
dc.contributor.authorSham, ASKen_HK
dc.contributor.authorLuk, HWKen_HK
dc.contributor.authorAndersson, Ben_HK
dc.contributor.authorChai, Jen_HK
dc.contributor.authorChow, TWen_HK
dc.date.accessioned2010-09-06T05:49:37Z-
dc.date.available2010-09-06T05:49:37Z-
dc.date.issued2004en_HK
dc.identifier.citationInternational Journal Of Prosthodontics, 2004, v. 17 n. 1, p. 24-28en_HK
dc.identifier.issn0893-2174en_HK
dc.identifier.urihttp://hdl.handle.net/10722/66819-
dc.description.abstractPurpose: The purposes of this study were to: (1) investigate the correlation between the color difference of bilayer porcelain veneers over white and black backgrounds (ΔE1) and their opacity (contrast ratios); (2) determine whether there is a recommendable threshold contrast ratio above which the color difference is clinically acceptable (when ΔE ≤ 5); and (3) compare the ability of porcelain veneers to mask a color change from white to black backgrounds (ΔE1) and their ability to mask a color change from white to clinically discolored teeth (ΔE2). Materials and Methods: Forty-four maxillary anterior teeth of eight patients with severe tetracycline discoloration were prepared for bilayer porcelain veneers in shade A2 porcelain. The cores were 0.25 mm thick. The color (CIE L*a*b*) and reflectance (Y) of the midbuccal region of each veneer were measured over white and black backgrounds using a colorimeter under artificial daylight. The veneers were bonded to discolored teeth, and their color was measured after 1 week. Results: The mean color difference ΔE1 was 10.6 (SD 2.6). The mean contrast ratio was 0.75 (SD 0.1). There was a close and statistically significant correlation between ΔE1 and contrast ratio. The determined threshold contrast ratio was 0.91. The mean color difference ΔE2 was 11.6 (SD 5.5). A paired t test showed no difference between ΔE1 and ΔE2. Conclusion: There was a significant correlation between the masking ability of veneers (ΔE1) and their opacity (contrast ratio). There was no significant difference in the ability of the porcelain veneers in masking a color change from white to black backgrounds compared to their ability to mask the color change from white to the discolored teeth.en_HK
dc.languageengen_HK
dc.publisherQuintessence Publishing Co, Inc. The Journal's web site is located at http://www.quintpub.comen_HK
dc.relation.ispartofInternational Journal of Prosthodonticsen_HK
dc.subject.meshAluminum Oxide - chemistryen_HK
dc.subject.meshColoren_HK
dc.subject.meshColor Perceptionen_HK
dc.subject.meshColorimetryen_HK
dc.subject.meshDental Porcelain - chemistryen_HK
dc.subject.meshDental Veneersen_HK
dc.subject.meshDifferential Thresholden_HK
dc.subject.meshHumansen_HK
dc.subject.meshMatched-Pair Analysisen_HK
dc.subject.meshMaterials Testingen_HK
dc.subject.meshOptics and Photonicsen_HK
dc.subject.meshPost and Core Technique - instrumentationen_HK
dc.subject.meshTime Factorsen_HK
dc.subject.meshTooth Discoloration - physiopathology - therapyen_HK
dc.titleThreshold Contrast Ratio and Masking Ability of Porcelain Veneers with High-Density Alumina Coresen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0893-2174&volume=17&spage=24&epage=28&date=2004&atitle=Threshold+contrast+ratio+and+masking+ability+of+porcelain+veneers+with+high-density+alumina+coresen_HK
dc.identifier.emailChu, FCS: cschu@hkucc.hku.hken_HK
dc.identifier.emailLuk, HWK: wkluka@hkucc.hku.hken_HK
dc.identifier.emailChow, TW: twchow@hku.hken_HK
dc.identifier.authorityChu, FCS=rp00035en_HK
dc.identifier.authorityLuk, HWK=rp00008en_HK
dc.identifier.authorityChow, TW=rp00009en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.pmid15008228en_HK
dc.identifier.scopuseid_2-s2.0-0842333941en_HK
dc.identifier.hkuros90179en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-0842333941&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume17en_HK
dc.identifier.issue1en_HK
dc.identifier.spage24en_HK
dc.identifier.epage28en_HK
dc.identifier.isiWOS:000188510000003-
dc.publisher.placeUnited Statesen_HK
dc.identifier.scopusauthoridChu, FCS=7201881096en_HK
dc.identifier.scopusauthoridSham, ASK=35887294400en_HK
dc.identifier.scopusauthoridLuk, HWK=7006636056en_HK
dc.identifier.scopusauthoridAndersson, B=7401941744en_HK
dc.identifier.scopusauthoridChai, J=7202678911en_HK
dc.identifier.scopusauthoridChow, TW=7203012369en_HK

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