Abstract
Objective To evaluate the effect of different desensitizing toothpastes and coffee staining on the discoloration rate of natural human tooth and composite materials. Materials and Methods A total of 56 human teeth and 56 composite specimens were used. After initial color measurements were taken, specimens and teeth were exposed to simulated toothbrushing with six desensitizing toothpastes containing different active ingredients: stannous fluoride, strontium acetate, potassium citrate and hydroxyapatite, cetylpyridinium chloride, arginine, and novamin. Specimens were then exposed to coffee staining. Throughout the staining procedure, the storing solution was refreshed every day and the specimens were brushed with the tested toothpastes. Color measurements and changes were recorded at each stage and analyzed with one-way ANOVA, Dunnett tests, and paired sample t-test (p<0.05). Results The largest color change was obtained with the stannous fluoride toothpaste after coffee staining for natural teeth (2.6 ΔE00⁎) and composite specimens (3.1 ΔE00⁎). Coffee staining resulted in significant changes for ΔE00⁎ values of all groups, except for natural teeth brushed with a novamin-based (p= 0.06) toothpaste. For composite specimens, only the stannous fluoride and cetylpyridinium chloride-based toothpastes resulted in significant color changes relative to the control group. ΔL⁎ and Δb⁎ values were also increased after staining for all groups (p<0.05). Conclusions Desensitizing toothpastes alone did not cause perceptible color changes; however, in combination with coffee staining, it tended to increased discoloration for both composites and natural teeth.
Highlights
Tooth hypersensitivity is a multifactorial condition typically characterized by sharp and brief arising in response to evaporative, thermal, osmotic, tactile, or chemical stimuli that cannot be ascribed to any other form of dental defect or disease [1]
The most commonly supported explanation of hypersensitivity is the hydrodynamic theory suggested by Brannstrom, which assumes that painful stimulation increases fluid flow within the dentinal tubules, stimulating baroreceptors and causing a neural signal and a painful sensation [3]
Accepted treatments are the application of a dentin sealer such as composite resin, glass ionomer, or the use of potassium salts, calcium phosphate, fluorides, strontium, BioMed Research International oxalates, glutaraldehyde, and formaldehyde as tubule plugs [5]
Summary
Tooth hypersensitivity is a multifactorial condition typically characterized by sharp and brief arising in response to evaporative, thermal, osmotic, tactile, or chemical stimuli that cannot be ascribed to any other form of dental defect or disease [1]. This clinically frequent oral health problem can cause pain while breathing, eating, or toothbrushing and its prevalence has been measured as ranging from 3% to 73% [2]. Accepted treatments are the application of a dentin sealer such as composite resin, glass ionomer, or the use of potassium salts, calcium phosphate, fluorides, strontium, BioMed Research International oxalates, glutaraldehyde, and formaldehyde as tubule plugs [5]. Various sensitivity-relief toothpastes are available worldwide, which include as active agents sodium fluoride (NaF), stannous fluoride (SnF2), arginine, potassium, strontium, or sodium calcium phosphosilicate [6, 7]
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