Color stability of denture teeth and acrylic base resin subjected daily to various consumer cleansers.

OBJECTIVE

This study evaluated color stability of acrylic denture teeth and base resins after 48 weeks of commercial denture cleanser simulation.

MATERIALS AND METHODS

Two brands of denture teeth (Trubyte Portrait IPN, TP; SR Vivodent DCL, SR) in shades A1, B1, and C1 and three acrylic base resins (Lucitone, LU; Paragon, PA; Valplast, VA) prepared to manufacturer's specifications were exposed 10 hours daily to four cleansers (Clorox Bleach, CB; Polident 3 minute, PO3; Efferdent, EF; and Kleenite, KL) and distilled water control, approximating consumer overnight use. Color measurements used the standard Commision International de l'Eclairage (International Commission on Illumination, CIE Lab*) color space (0, 4, 12, 24, 36, and 48 weeks.) Color differences (ΔE*) at 48 weeks were subjected to four-way analysis of variance (ANOVA). Mean values were compared with Fisher's (protected least significant difference) intervals (0.05 significance level).

RESULTS

Mean color differences (ΔE*) demonstrated color changes in each material. ANOVA-indicated color changes in teeth were significantly affected by both cleansers and teeth brand (p < 0.05), but not shade. Color changes in base resins were significantly affected by cleansers (p < 0.05), but not brand alone. Overall, KL produced the least color change while CB and PO3 produced the most for all materials.

CONCLUSIONS

After 48 weeks of daily simulation, TP teeth were more color stable than SR in all cleansers except EF (p < 0.0001). Base resin VA was less color stable than LU and PA. Cleanser KL resulted in the lowest color changes.

CLINICAL SIGNIFICANCE

All tested materials yield clinically acceptable color changes (ΔE* < 3.5); all cleansing methods tested can be recommended, although Kleenite demonstrated the least change after 48 weeks.