Name: Lucas Campagnaro Maciel
Type: MSc dissertation
Publication date: 17/03/2016
Advisor:

Name	Role
Anuar Antonio Xible	Advisor *

Examining board:

Name	Role
Anuar Antonio Xible	Advisor *
Juliana Malacarne Zanon	Internal Examiner *
Marcelo Massaroni Peçanha	External Examiner *
Stefania Carvalho Kano	Co advisor *

Summary: Statement of the Problem: Corrections are commom step to adapt clinically and aesthetically ceramic piece, resulting in loss of gloss and surface smoothness achieved by the glaze, which may cause discoloration of these materials. Purpose: To evaluate the effect of superficial treatment on the surface roughness and the color change of the glass-ceramics pressed and veenered after immersed in coffee solution. Material and Methods: 88 ceramic discs were made (1.0 mm x 10.0 mm) according to the manufacturer's recommendations. Where, 44 were pressed glass-ceramic (Group P)
and 44 glass-ceramic veneered (Group C). Groups were divided into four subgroups according to the surface treatment: (G) Glaze, (S) polishing kit Shofu Inc, (E) polishing it Edenta AG, (KG) diamond rotatory instrument 30 µm. Surface roughness (Ra) tests were performed after surface treatment and color change (ΔE) before and after 12 days after immersion in coffee solution. A qualitative analysis of the surface of the specimens was made with scanning electron microscopy. Data were statistically analyzed with ANOVA 1 factor and Duncan, further the paired t-test and Pearson correlation (α = 5%). esults: The ascending order for both surface roughness (Ra) and ΔE for both
ceramics were: G < S < E < KG. Except subgroups PG and VG that showed no
statistically significant difference each other, all other subgroups of pressed ceramic showed lower values of Ra and higher &#916;E values than the veneering porcelain.Conclusion: The change of color of dental ceramics can be influenced by the surface roughness, and there is a strong correlation between surface roughness and color change of the tested ceramics.

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