Influence of polishing systems on roughness and color change of two dental ceramics (original) (raw)
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The Journal of Indian Prosthodontic Society, 2013
Ceramic restorations have been widely used in dentistry. These restorations often require intraoral adjustment with diamond burs after their cementation causing increasing roughness of the ceramic surface. Consequently some finishing and polishing methods have been used to minimize this occurrence. The aim of this study is to evaluate the roughness of the ceramic surfaces submitted to different finishing and polishing methods. 144 specimens of VITAVM Ò 7, VM Ò 9 and VM Ò 13 (VITA Zahnfabrik) ceramics were fabricated and submitted to grinding using diamond burs. They were then divided into 15 groups (five of each ceramic type). Groups 1, 6 and 11-positive control (Glaze); Groups 2, 7 and 12-negative control (no polishing); Groups 3, 8 and 13-polished with abrasive rubbers (Edenta), felt disc and diamond polishing past; Groups 4, 9 and 14-polished with abrasive rubbers (Shofu), felt disc and diamond polishing past; Groups 5, 10 and 15-polished with aluminum oxide discs (Sof-Lex, 3M-ESPE), felt disc and diamond polishing paste. The roughness of the samples surfaces were measured using the rugosimeter Surfcorder SE 1700 and the data were submitted to statistical analysis using ANOVA and Tukey test at a level of significance of 5 %. There was statistically significance difference between the positive control groups and the other groups in all the ceramic types. Mechanical finishing and polishing methods were not able to provide a surface as smooth as the glazed surface for the tested ceramics. To assist dental practitioners to select the best finishing and polishing methods for the final adjustment of the ceramic restorations.
SciDoc Publishers, 2020
Background: The study aims to investigate the effect of different polishing methods on the dental porcelain surface roughness and tea extract staining resistance. Methods: A total of 40 disc-shaped dental porcelain of 10mm diameter and 2mm thickness were divided into four groups: Group A (Glaze), untreated control; Group B (Polishing paste), using slow speed green stone bur and followed by diamond polishing paste; Group C (NTI), using NTI CeraGlaze polishing kits; and Group D (Identoflex), using Identoflex Diamond Ceramic Polisher. The specimens were then subjected to a baseline measurement for surface roughness and colour shade using a surface profilometer and digital spectrophotometer, respectively. The glaze layer was removed using a medium-grit diamond rotary bur, followed by 60 seconds polishing according to the assigned method. A second surface roughness measurement ensued. The specimens were then subjected to thermal cycling between 5°C and 55°C for 2000 cycles, followed by 30 days staining in a tea extract solution. A second colour shade measurement ensued. Results: The surface roughness of dental porcelain was highest in the Polishing paste group (p < 0.05), and the NTI and Identoflex group were not significantly different from the Glaze group (p > 0.05). In all test groups, the Glaze group shows superiority in colour stability with DE value significantly higher compared to all test group (p < 0.05). Conclusion: Although the mechanical polishing can restore the smoothness of the glazed surface, it cannot restore the ability to resist tea extract staining.
Purpose: To evaluate the effects of the different available intraoral ceramic polishing systems on the surface roughness of the latest ceramic materials. Methods: Eighty ceramic discs (5mmx2mm) were prepared from 2 ceramic materials (VM9 and e.max) using stainless steel mold. The discs were then randomly divided into 4 subgroups for each material (n=10). A Fine diamond bur was used to remove the glaze layer on one side of the disc (the other side serving as a control), and the samples were then polished by one of the 4 polishing systems (Sof-lex discs, Optrafine, EVE, and Jazz). Surface roughness was measured quantitatively by Profilometer and qualitatively by SEM. Three roughness readings were taken for each sample before being polished, after removal of the glaze layer, and after being polished. Results: The mean Ra value for the glazed surface (control) was (Ra=0.557). The lowest mean Ra value was recorded for the Sof-lex polishing system with the e.max material (Ra=0.195). The highest mean Ra value was recorded for the Jazz polishing system with the VM9 material. There was no statistically significant difference between Optrafine and EVE with VM9 and Sof-lex, Optrafine and EVE with e.max. Conclusion: The use of ceramic polishing kits was effective in reducing surface roughness. The polished ceramic samples were as smooth as their controls. Therefore, any needed adjustment to the ceramic restoration can be achieved by the use of a ceramic polishing kit, without the need for glazing.
European Journal of Dentistry
Objective This article evaluates the effect of multipurpose polishing kit on surface roughness and hardness of three computer-aided design/computer-aided manufacturing (CAD/CAM) ceramic materials at different polishing durations. Weight changes of the polishing bur were also determined. Material and Methods Three CAD/CAM ceramic materials were lithium disilicate glass ceramic (IPS e.max CAD), translucent zirconia (VITA YZ), and zirconia-reinforced lithium disilicate ceramic (Celtra Duo). Ceramics were ground with a diamond bur, and polished with the multipurpose polishing kit (Eve Diacera HP), which comprises coarse and fine polishing burs. Surface roughness value (Ra) was measured using a noncontact optical profilometer (n = 10 per group) after grinding and every 15 seconds of coarse and fine polishing until 60 seconds. The complete polishing Ra was compared with the lab as-received specimens and human enamel. Surface morphology was examined using a scanning electron microscope aft...
Egyptian Dental Journal
Purpose: Objectives of this study were to assess and compare the impact of coloring beverages and surface finishing on color stability and surface roughness of dental ceramics. Material and methods: Twenty-eight identical cuboids (14*12*1mm) were cut from zirconiareinforced lithium silicate blocks (suprinity) using a precision cutting machine. Another 28 identical cuboids with the same dimensions were milled from high translucent zirconia ceramic blank (zolid fx). The specimens of each ceramic material were divided into 2 main groups (n=14) according to the finishing technique used; group G: specimens were glazed. group P: specimens were polished. Each subgroup was subdivided into 2 subgroups (n=7) according to the immersion solution used; Tea or Cola. Color measurements and surface roughness of all specimens were measured at the beginning and after 28 days of immersion in the staining beverages. Results: Tea possessed the highest color changes in all tested groups, and these changes were statistically significant compared with those of Cola in both surface finishing groups and in both types of ceramics. The color changes of Tea were not clinically acceptable in the zirconia ceramic groups (ΔE ˃3.3). While Cola possessed the highest mean Ra in all tested groups, and these changes were statistically significant compared with those of Tea in both surface finishing groups and in both types of ceramics. Conclusions: Tea showed the highest impact on color of polished and glazed types of used ceramics, while Cola significantly increased the surface roughness of both polished and glazed types of used ceramics.
Journal of Advanced Clinical and Research Insights, 2019
Background: Provisional fixed restoration is an essential component in prosthodontics treatment. These materials may experience color change for surface roughness. To reduce it, a polishing technique is required with a time setting specified. Aims and Objectives: The aim of this study was to evaluate the effect of different polishing time on the color stability of provisional materials. Materials and Methods: One hundred and forty-four resin blocks were prepared, divided into Group A, PMMA acrylic resin and Group B, bis-acryl resin. They were polished with goat hairbrush and diamond paste. Twenty-four hours stored in distilled water and 12 th day on the staining solution coffee and wine. They were measured with a spectrophotometer, analyzed, and processed with the CieLab system, to calculate color difference ∆E. Results: On the 3 rd day of the immersion period, the lowest mean value was showed with 1 min polishing on Group A, showing to be statistically significant, P = 0.011. In Group B, the lowest mean value was showed with 1 min 30 s. At the 7 th and 12 th days immersion period, the lowest mean value was showed with 30 s polishing among the groups. Conclusions: Polishing 30 s showed the lowest ∆E values on PMMA and bis-acryl resin. Mean color differences were above the clinical acceptability threshold ∆E > 3.3. Regarding the staining agent, the highest ΔE values were observed in coffee.
The effect of repeated firings on the color change and surface roughness of dental ceramics
The Journal of Advanced Prosthodontics, 2014
PURPOSE. The color of the ceramic restorations is affected by various factors such as brand, thickness of the layered the ceramic, condensation techniques, smoothness of surface, number of firings, firing temperature and thickness of dentin. The aim of this study was to evaluate the color change and surface roughness in dental porcelain with different thicknesses during repeated firings. MATERIALS AND METHODS. Disc-shaped (N=21) metal-ceramic samples (IPS Classic; Ivoclar Vivadent; Shaar, Liechtenstein) with different thickness were exposed to repeated firings. Color measurement of the samples was made using a colorimeter and profilometer was used to determine surface roughness. ANOVA and Tukey tests with repeated measurements were used for statistical analysis. RESULTS. The total thickness of the ceramics which is less than 2 mm significantly have detrimental effect on the surface properties and color of porcelains during firings (P<.05). CONCLUSION. Repeated firings have effects on the color change and surface roughness of the dental ceramics and should be avoided.
The Journal of Indian Prosthodontic Society
To find and compare the qualitative and quantitative change in color and surface texture of feldspathic ceramic, pressable ceramic and ceramic used in computer-aided design/computer-aided manufacturing CAD/ CAM after different surface treatments namely glazing, abrading and polishing. To compare the effectiveness of pearl finish polishing paste and Soflex polishing system used in the study. Setting and Design: In-vitro, comparative study. Materials and Methods: Disc-shaped feldsapathic, pressable, CAD/CAM ceramic specimens were fabricated. Surface roughness and color parameters ∆ L*, ∆a*, and ∆ b* were measured before glazing, after glazing, after abrasion with 02 diamond bur and after polishing with two different polishing systems. Surface roughness was measured qualitatively using scanning electron microscopy and quantitatively using an optical profilometer. The value of color parameters was obtained using a colorimeter. Data were statistically analyzed with ANOVA. Statistical Analysis Used: SPSS software 20.0 version (IBM, New York, United states of America). Results: Unglazed feldspathic, pressable and CAD/CAM porcelain specimens showed a mean surface roughness value of 2.73 ± 0.38, 3.54 ± 1.42, and 3 ± 1.74 specimens. After glazing and polishing, the surface roughness values decreased. After abrasion, surface roughness values increased. Polishing did not alter the color along the red green axis and yellow blue axis. Conclusions: Abraded specimens of feldspathic, pressable and CAD/CAM after polishing using pearl finish polishing paste and Soflex disc became smoother than glazed specimens. When pearl finish polishing paste