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Effect of brushing using different dentifrices on discoloration and roughness of resin composites with different
Patrick Nabholz1, Jeffery S Nordin2, Brian R Morrow3
1Department of Pediatric Dentistry, College of Dentistry, University of Tennessee Health Science Center, Memphis, TN, USA.
Purpose:
To evaluate the changes in color, translucency, roughness, and depth loss of various composites with different formulations (Filtek One Bulk Fill, Admira Fusion X-tra Bulk-fill, and XRV Herculite) after toothbrushing using dentifrices containing charcoal and charcoal-free.
Methods:
32 resin composite discs (8.0 x 1.5 mm) were prepared for each Filtek One Bulk Fill, Admira Fusion X-tra Bulk-fill, and XRV Herculite. Discs were evaluated with a spectrophotometer for color and roughness measurements before and after treatments. Sample treatment included toothbrushing on a V-8 toothbrushing machine for 10,000x to simulate daily oral care with four different dentifrices (Colgate Total SF, Crest Pro-Health Complete Protection Intensive Cleaning+Whitening, Colgate Total Whitening Charcoal, and Crest Charcoal 3D White). After toothbrushing, color (ΔE₀₀), roughness (Ra and Rz), depth loss (DL), and translucency (TP₀₀, and ΔTP₀₀) were remeasured and deduced from initial measurement for the standard difference in each respective parameter. Data were calculated and statistically analyzed independently using a two-way repeated measures ANOVA and Holm-Sidak post-hoc test with P< 0.05 significance.
Results:
Admira and Filtek, when brushed with Colgate Total SF resulted in less roughness and DL when compared to both charcoal dentifrices. Admira was found slightly rougher than Herculite and Filtek with Crest Pro-Health and similar to both charcoal groups. However, Admira with Crest Pro-Health was similar to Herculite and Filtek but significantly different from both charcoal groups. All dentifrices had a significant staining effect on all composites relative to the baseline color. Admira and Filtek composites were above the clinical acceptance threshold (AT) of 1.8 for ΔE₀₀, with Herculite only surpassing the limit with Crest Charcoal. Lastly, Herculite with all dentifrices was below the clinical perceptibility threshold (PT) for translucency difference. Both Admira and Filtek were above the ΔTP₀₀ PT but less than the AT for all dentifrices except Colgate Charcoal.
Clinical Significance:
Charcoal dentifrices changed the color of Admira samples. Colgate charcoal resulted in a significantly different color change versus using Colgate Total and Crest Pro-Health. All three resins resulted in statistically significant color change when using all non-charcoal-containing dentifrices.
