Statement of problem
Provisional resins are used extensively during fixed prosthodontic treatment and exhibit
varying degrees of color change/discoloration over time. Data are needed to help predict
color stability of provisional resins.
Purpose
The purpose of this in vitro study was to measure the color change of 12 provisional
prosthodontic materials after immersion in artificial saliva and artificial saliva–coffee
solutions for 1, 2, and 4 weeks.
Material and methods
Twelve provisional materials were studied. Methacrylates consisted of Alike, Jet,
Temporary Bridge Resin, Unifast, and Zeta CC. Bis-acryl resins included Instatemp,
Integrity, Luxatemp, Protemp Garant, Provipont, Provitec, and Temphase. Ten specimens
(25.4 mm × 25.4 mm × 2.4 mm) of each material were fabricated. Five specimens were
stored at 37°C in artificial saliva and 5 were stored in a solution of artificial
saliva (400 cc) and coffee (800 cc). Baseline color was measured using a colorimeter.
Further color measurements were made after 1, 2, and 4 weeks of immersion. CIE L∗a∗b∗
values were recorded and color differences (ΔE) between baseline and each storage
interval were calculated using a 2-way ANOVA with Bonferroni adjustment for multiple
comparisons in conjunction with an overall α=.05.
Results
Results indicated the presence of strong interaction between material and storage
solution regardless of the aspect of color considered (P<.0001 for ΔE, ΔL∗, Δa∗, and Δb∗). Coffee solution relative to saliva solution had
the most significant impact on color change for Luxatemp, Protemp, and Temphase materials
at 4 weeks, but the greatest overall color change for both coffee and saliva solutions
was found for Provipont (ΔE = 9.40 coffee; 8.51 saliva) and the least overall color change for both solutions was
found for Zeta CC (ΔE= 0.31 coffee; 0.23 saliva).
Conclusions
Under the conditions of this study, 12 provisional crown and fixed partial denture
resins demonstrated varying tendency to discolor over a range of time periods when
immersed in artificial saliva and artificial saliva–coffee solutions.
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Article info
Publication history
Virginia Commonwealth University, Richmond, Va; University of Iowa, Iowa City, Iowa
Identification
Copyright
© 2005 The Editorial Council of The Journal of Prosthetic Dentistry. Published by Elsevier Inc. All rights reserved.
