Using Kubelka-Munk reflectance theory to predict optimal pink composite thickness and shade with an opaqued PEEK background for a final gingival color: An in vitro study.

Gouveia, Diogo; Yilmaz, Burak; Cevik, Pinar; Johnston, William Michael (2022). Using Kubelka-Munk reflectance theory to predict optimal pink composite thickness and shade with an opaqued PEEK background for a final gingival color: An in vitro study. Dental materials, 38(9), pp. 1452-1458. Elsevier 10.1016/j.dental.2022.06.027

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OBJECTIVES

The aims of this study were to demonstrate and evaluate how Kubelka-Munk (K-M) reflectance theory is used to adjust the color of the opaqued PEEK backing and the color and thickness of the resin composite layers in different thicknesses in order to minimize the color difference from a target gingival color.

METHODS

PEEK specimens were opaqued with either a dark or a light opaquer. Composite resin layers in 3 different colors were fabricated in varying thicknesses. Reflectance of opaqued PEEK and composite layers was determined using a spectroradiometer. Kubelka-Munk (K-M) absorption (K) and scattering (S) coefficients were derived for each material and then K-M reflectance theory was then used to predict the reflectance of each composite disk as layered on each backing. The color of the opaqued PEEK backings alone and the color of 12 pink composite layers on opaqued PEEK backings was calculated for the CIE D65 Illuminant. Composite resins in 3 different color were then bonded to the opaqued PEEK specimens and color differences of these specimens from the theoretical colors were determined.

RESULTS

The ∆E00 values ranged from 0.45 to 1.29 units for the bonded pink specimens and the K-M theory. K-M theory was validated as a viable predictor of gingival color using pink composite bonded to opaqued PEEK background.

SIGNIFICANCE

Using K-M theory to predict the gingival color of pink composite bonded to opaqued PEEK eliminates the need to make many specimens of different thicknesses that would otherwise be required to find an acceptable color match.

Item Type:

Journal Article (Original Article)

Division/Institute:

04 Faculty of Medicine > School of Dental Medicine > Department of Reconstructive Dentistry and Gerodontology
04 Faculty of Medicine > School of Dental Medicine > Department of Preventive, Restorative and Pediatric Dentistry

UniBE Contributor:

Yilmaz, Burak

Subjects:

600 Technology > 610 Medicine & health

ISSN:

0109-5641

Publisher:

Elsevier

Language:

English

Submitter:

Pubmed Import

Date Deposited:

11 Jul 2022 14:46

Last Modified:

05 Dec 2022 16:21

Publisher DOI:

10.1016/j.dental.2022.06.027

PubMed ID:

35798579

Uncontrolled Keywords:

Color Composite resin Dental prosthesis Polyetheretherketone Radiation Scattering

BORIS DOI:

10.48350/171201

URI:

https://boris.unibe.ch/id/eprint/171201

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