Research Article The Effect of Desensitizing Toothpastes and Coffee Staining on the Optical Properties of Natural Teeth and Microhybrid Resin Composites: An In-Vitro Study Sedanur Turgut , 1 Hamiyet KJlJnç, 2 KJvanç Utku Ulusoy , 3 and Bora Bagis 4 1 Ph.D., DDS, Assoc. Professor Dr., Department of Prosthodontics, Faculty of Dentistry, Karadeniz Technical University, Trabzon, Turkey 2 Ph.D., DDS, Assist. Professor Dr., Department of Prosthodontics, Faculty of Dentistry, Bolu Abant Izzet Baysal University, Bolu, Turkey 3 Ph.D., DDS, Department of Restorative Dentistry, Faculty of Dentistry, Karadeniz Technical University, Trabzon, Turkey 4 Ph.D., DDS, Professor Dr., Department of Prosthodontics, Faculty of Dentistry, Izmir Katip Celebi University, Izmir, Turkey Correspondence should be addressed to Bora Bagis; bbagis@yahoo.com Received 26 July 2018; Revised 7 November 2018; Accepted 6 December 2018; Published 23 December 2018 Academic Editor: Andrea Scribante Copyright © 2018 Sedanur Turgut et al. Tis is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. Objective. To evaluate the efect of diferent desensitizing toothpastes and cofee 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. Afer initial color measurements were taken, specimens and teeth were exposed to simulated toothbrushing with six desensitizing toothpastes containing diferent active ingredients: stannous fuoride, strontium acetate, potassium citrate and hydroxyapatite, cetylpyridinium chloride, arginine, and novamin. Specimens were then exposed to cofee staining. Troughout 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. Te largest color change was obtained with the stannous fuoride toothpaste afer cofee staining for natural teeth (2.6 Δ 00 ∗ ) and composite specimens (3.1 Δ 00 ∗ ). Cofee staining resulted in signifcant changes for Δ 00 ∗ values of all groups, except for natural teeth brushed with a novamin-based (p= 0.06) toothpaste. For composite specimens, only the stannous fuoride and cetylpyridinium chloride-based toothpastes resulted in signifcant color changes relative to the control group. ΔL ∗ and Δb ∗ values were also increased afer staining for all groups (p<0.05). Conclusions. Desensitizing toothpastes alone did not cause perceptible color changes; however, in combination with cofee staining, it tended to increased discoloration for both composites and natural teeth. 1. Introduction 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]. Tis 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]. Te most commonly supported explanation of hypersensitivity is the hydrodynamic theory suggested by Brannstrom, which assumes that painful stimulation increases fuid fow within the dentinal tubules, stimulat- ing baroreceptors and thus causing a neural signal and a painful sensation [3]. Terefore, ideal treatment for hyper- sensitivity should block the exposed dentinal tubules or reduce fuid fow within the dentinal tubules [4]. Gener- ally accepted treatments are the application of a dentin sealer such as composite resin, glass ionomer, or the use of potassium salts, calcium phosphate, fuorides, strontium, Hindawi BioMed Research International Volume 2018, Article ID 9673562, 7 pages https://doi.org/10.1155/2018/9673562