J Adv Prosthodont.  2019 Aug;11(4):215-222. 10.4047/jap.2019.11.4.215.

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

• Maciel LC
• Silva CF
• de Jesus R
• Concílio
• Kano SC
• Xible AA

• KMID: 2455930
• DOI: http://doi.org/10.4047/jap.2019.11.4.215

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.

Keyword

Ceramics; Pigmentation; Spectrophotometry; Dental restoration; Surface roughness

MeSH Terms

Ceramics*
Coffee
Diamond
Immersion
Lithium
Microscopy, Electron, Scanning
Pigmentation
Spectrophotometry
Coffee
Diamond
Lithium

Figure

• 

  Fig. 1 Experimental sketch. Ceramics and surface treatments applied in this study.

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  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.

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  Fig. 3 Pearson correlation analysis. Graph of dispersal between the surface roughness (Ra) and the color change (ΔE) in Group C.

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  Fig. 4 Pearson correlation analysis. Graph of dispersal between the surface roughness (Ra) and the color change (ΔE) in Group P.

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