Does polishing of bleached enamel affect roughness and tooth color stability after exposure to coffee?

Abstract

Objective: This laboratory randomized study was designed to evaluate the effect of polishing on roughness and color stability of bleached teeth after coffee immersion.Materials and Methods: Ninety bovine crowns were randomly allocated to six groups (n = 15), according to bleaching protocols: At-home: standard protocol using 10% hydrogen peroxide (HP) or In-office: standard protocol using 35% HP; and with polishing protocols: (1) no polishing, (2) bleached enamel polished with #0.5 μm or (3) #2-4 μm diamond particles grit pastes. Samples were daily immersed into coffee solution for 45 min followed by mechanical brushing simulation (30 s) for 30 days.The surface roughness (Ra) and color alteration, expressed by ΔE ab , ΔE 00 , and whitening index (WI) were analyzed at baseline, after bleaching/polishing protocols and after coffee solution staining. The surface from each group was examined using a scanning electron microscope. Data were analyzed by two-way repeated measure analysis of variance followed by the Tukey test (α = 0.05).Results: Staining increases Ra, ΔE ab , ΔE 00 , and decreases WI values. Polishing after bleaching did not prevent staining, however, tooth polished with #0.5 μ-grit polishing paste showed better performance than #2-4 μ-grit (ΔE ab : p = 0.001/ΔE 00 : p = 0.003). Scanning electron microscope revealed a more irregular surface after coffee staining for all groups regardless bleaching/polishing protocols.Conclusions: Using #0.5 μ-grit diamond paste to polish 35%HP in-office bleached enamel reduces the roughness and tooth staining. However, polishing after 10%HP at-home bleached enamel neither affects roughness nor improves tooth color stability after exposure to coffee.Clinical Significance: Polishing after at-home bleaching does not have benefits but after 35% hydrogen peroxide in-office bleaching, the polishing with #0.5 μ-grit polishing paste is indicated to reduce roughness and the tooth staining over time.

Effect of an In-Office Bleaching Agent with Surface Pre-Reacted Glass-Ionomer Filler on the Enamel Surface: A In-Vitro Study

“…Also, this altered enamel is believed to be vulnerable to subsequent staining over time. Thus, smoothening enamel surfaces with polishing paste after in-office bleaching has been recommended for enhanced color stability [46]. In the current SEM investigation, the enamel morphology in specimens bleached with a paste containing S-PRG filler reflected surfaces with fewer morphological alterations, and the results were comparable to those for the non-bleached surfaces.…”

Is a White Diet Necessary for Tooth Bleaching Procedures? A Systematic Review and Meta-Analysis

“…Upon closer examination, 22 of these studies were excluded for the following reasons: in 8 studies, no pigments were used during or after the bleaching process [28][29][30][31][32][33][34][35], 5 studies lacked a control group [14,16,[36][37][38], in 4 studies, the color difference, luminosity or whiteness index was not calculated [4,[39][40][41], in 4 studies, the full text could not be retrieved [42][43][44][45], and 1 study was a review [23]. This process left 17 documents eligible for qualitative analysis: 5 clinical trials [46][47][48][49][50] and 12 in vitro studies [21,[51][52][53][54][55][56][57][58][59][60][61].…”

<i>In-vitro</i> evaluation of wear characteristics, microhardness and color stability of dental restorative CAD/CAM materials

“…Discoloration of dental materials can be affected by staining drinks such as black tea, red wine, cola, and coffee which are common in daily diet. Coffee is one of the most effective beverages having high potential to stain 8) . Composite resins and RNC CAD/CAM blocks may also be discolored by the staining solutions.…”