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Color stability of provisional restorative materials after accelerated aging
Author(s) -
Doray Pamela G.,
Li Dongfang,
Powers John M.
Publication year - 2001
Publication title -
journal of prosthodontics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.902
H-Index - 60
eISSN - 1532-849X
pISSN - 1059-941X
DOI - 10.1111/j.1532-849x.2001.00212.x
Subject(s) - accelerated aging , materials science , acrylic resin , composite material , ultraviolet irradiation , irradiation , coating , physics , nuclear physics
Purpose Color of 11 provisional restorative materials (4 acrylic resins and 7 resin composites) was evaluated by reflection spectrophotometry immediately after fabrication, after aging for 15 kJ/m 2 , and after aging for 60 kJ/m 2 to determine relative color stability under experimental aging conditions. Materials and Methods Specimens of provisional restorative materials were polymerized according to manufacturers' instructions and aged in an artificial aging chamber with exposure to a total ultraviolet irradiation of 60 kJ/m 2 in increments of 15 kJ/m 2 . Color was measured by CIE L*a*b* on a reflection spectrophotometer before and after aging. Color change (ΔE*) was calculated and analyzed statistically by analysis of variance with repeated measures after 15 and 60 kJ/m 2 intervals of aging. Results Statistically significant changes in color were observed after accelerated aging at both the initial and final aging intervals. Five of the 11 provisional materials tested showed perceptible color change (ΔE* from 3.6 to 9.3) after accelerated aging of 15 kJ/m 2 . Seven of the 11 provisional materials tested showed perceptible color change (ΔE* from 3.4 to 9.4) after accelerated aging of 60 kJ/m 2 . Conclusion Clinically perceptible color changes (ΔE*Δ 3.3) can be expected in some acrylic resin and composite resin provisional materials after accelerated aging.