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. 2019 Aug;11(4):215-222.
doi: 10.4047/jap.2019.11.4.215. Epub 2019 Aug 27.

Influence of polishing systems on roughness and color change of two dental ceramics

Lucas Campagnaro Maciel  1 , Carlos Frederico Bettcher Silva  2 , Ricardo Huver de Jesus  3 , Laís Regiane da Silva Concílio  1 , Stefania Carvalho Kano  4 , Anuar Antônio Xible  4
Affiliations

Influence of polishing systems on roughness and color change of two dental ceramics

Lucas Campagnaro Maciel et al. J Adv Prosthodont. 2019 Aug.

Abstract

Purpose: To evaluate the polishing effect on roughness and color change of pressed and layering ceramics after immersion in coffee solution.

Materials and methods: 88 ceramic discs (1.0 mm × 10.0 mm) were manufactured - 44 nano-fluorapatite layering ceramics (IPS e.max Ceram. Group C) and 44 pressed lithium disilicate ceramic discs (IPS e. max Press - Group P). Each group was divided into 4 subgroups according to surface treatments: (G) Glaze, (S) Shofu polishing system (Shofu Inc.), (E) Edenta AG polishing System, (KG) 30-µm diamond granulation tip. Surface roughness (Ra) and color change (ΔE) measurings after the surface treatments were performed, before and 12 days after the immersion in coffee solution. A samples' qualitative analysis was conducted with a scanning electron microscopy (SEM). Data were statistically-treated with one-way-ANOVA and Duncan's tests, apart from paired t-test and Pearson's correlation test (α=5%).

Results: The decrescent order, both for surface roughness (Ra) and ΔE for both ceramics were: KG > E > S > G (P<.05). With exception for PG and CG subgroups, which did not present statistical difference between them, all other pressed ceramics subgroups presented smaller Ra values and greater ΔE values than the layering ceramics subgroups (P<.05).

Conclusion: Although mechanical polishing systems presented intermediate Ra values, their colors were considered clinically acceptable. There is a strong correlation between the surface roughness and the color change of tested ceramics.

Keywords: Ceramics; Dental restoration; Pigmentation; Spectrophotometry; Surface roughness.

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Figures

Fig. 1
Fig. 1. Experimental sketch. Ceramics and surface treatments applied in this study.
Fig. 2
Fig. 2. Scanning electron microscopy (× 1,000) of layering ceramics (C Group) and pressed ceramics (P Group) after different surface treatments: (G) Glaze, (S) Shofu Inc polishing system, (E) Edenta AG polishing system and (KG) 30 µm diamond tip.
Fig. 3
Fig. 3. Pearson correlation analysis. Graph of dispersal between the surface roughness (Ra) and the color change (ΔE) in Group C.
Fig. 4
Fig. 4. Pearson correlation analysis. Graph of dispersal between the surface roughness (Ra) and the color change (ΔE) in Group P.
See this image and copyright information in PMC

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