KMID : 1023820190110040215
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The Journal of Advanced Prosthodontics 2019 Volume.11 No. 4 p.215 ~ p.222
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Influence of polishing systems on roughness and color change of two dental ceramics
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Maciel Lucas Campagnaro
Silva Carlos Frederico Bettcher de Jesus Ricardo Huver da Silva Concilio Lais Regiane Kano Stefania Carvalho Xible Anuar Antonio
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Abstract
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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-¥ìm diamond granulation tip. Surface roughness (Ra) and color change (¥ÄE) 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 (¥á=5%).
RESULTS: The decrescent order, both for surface roughness (Ra) and ¥ÄE 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 ¥ÄE 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.
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KEYWORD
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Ceramics, Pigmentation, Spectrophotometry, Dental restoration, Surface roughness
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