Effect of two polishing systems on color and surface roughness of feldspathic porcelain following orthodontic bracket debonding and composite resin removal

Abstract

Objectives Orthodontic bracket removal from a porcelain crown can roughen the surface and lead to plaque accumulation, discoloration, and esthetic problems. Porcelain polishing after debonding is one strategy to decrease such consequences. This study aimed to compare the efficacy of two polishing systems (Sof-Lex discs and Meisinger polishing system) for correction of surface roughness and discoloration of porcelain after orthodontic bracket debonding. Materials and Methods Twenty porcelain blocks were evaluated in two groups of 10. First, the baseline surface roughness and color parameters of the samples were measured using atomic force microscopy and spectrophotometry, respectively. After bracket bonding, a fine cutter was used for bracket debonding, and resin remnants were removed by a tungsten carbide bur and low-speed handpiece. Samples were then polished using Sof-Lex discs (group 1) and Meisinger porcelain polishing kit (group 2). Surface roughness and color parameters were measured again. Data were analyzed using SPSS 18 through the Shapiro–Wilk test, Student’s t-test, and paired t-test at 5% level of significance. Results Porcelain color change (ΔE) was significantly greater in the Meisinger system than Sof-Lex (P < 0.001). The Rq, Ra, and Rt surface roughness parameters significantly increased in both the groups after the intervention compared to baseline (P < 0.05), but the two groups were not significantly different in this respect after the polishing procedures (P > 0.05). Conclusion The porcelain color after polishing with Sof-Lex discs was closer to the baseline. Furthermore, the two systems were not significantly different regarding surface roughness. However, Sof-Lex discs may be recommended due to lower cost.

Effectiveness of Porcelain Polishing Methods on the Roughness and Color Stability of CAD–CAM Ceramics after Orthodontic Bracket Debonding

“…Sasany et al [29] recommended polishing with the Sof-Lex system and opinioned that the smoothness and color stability are material and surface treatment dependent. Ameli et al [55] reported that debonded surface polishing with flexible discs results in a porcelain color closer to the baseline.…”

Effect of orthodontic bonding with different surface treatments on color stability and translucency of full cubic stabilized zirconia after coffee thermocycling

“…14 Nonetheless, orthodontic bracket bonding on ceramic restorations may increase the surface roughness (due to surface treatment or residual resin removal), change the esthetic appearance of restoration, decrease its longevity, enhance plaque retention, leading to periodontal problems and restoration discoloration. 15 Since zirconia is devoid of glass phase, hydrofluoric acid cannot be used to enhance its bond strength. 16 The suggested strategies for surface treatment of zirconia to enhance its bond strength include airborne particle abrasion (APA), silica-coating, and laser irradiation.…”

“…16 The suggested strategies for surface treatment of zirconia to enhance its bond strength include airborne particle abrasion (APA), silica-coating, and laser irradiation. 16 The effect of different surface treatments in the process of orthodontic bonding, and orthodontic treatment in general, on color parameters and color stability of enamel, [17][18][19][20][21][22][23][24] and feldspathic porcelain 15,[25][26][27] has been previously studied. To the best of the authors' knowledge, no previous study has addressed the effect of orthodontic treatment on color parameters of zirconia restorations.…”