Flexural strength of monolithic zirconia: Effect of finishing/polishing procedures

2018 ◽  
Vol 34 ◽  
pp. e126
Author(s):  
T.E.L. Vila-Nova ◽  
I.H.G. Carvalho ◽  
D.M.D. Moura ◽  
G.M. Araújo ◽  
A.H. Veríssimo ◽  
...  
Keyword(s):  
Flexural Strength ◽  
Monolithic Zirconia ◽  
Polishing Procedures

scholarly journals Biaxial flexural strength of different types of monolithic zirconia

2019 ◽  
Vol 22 (1) ◽  
pp. Process
Author(s):  
Shereen Ahmed Nossair ◽  
Tarek Salah ◽  
Kamal Khaled Ebeid
Keyword(s):  
Flexural Strength ◽  
Zirconia Ceramic ◽  
Group 4 ◽  
Dental Esthetics ◽  
Biaxial Flexural Strength ◽  
Different Types ◽  
Monolithic Zirconia ◽  
Group 5 ◽  
Group 2 ◽  
Post Hoc

Objective: This study was designed to evaluate the biaxial flexural strength (BFS) of different types of unshaded and shaded monolithic zirconia. Material and Methods: 120 monolithic zirconia ceramic discs were fabricated. They were divided into twelve groups (n=10), Group 1; Bruxzir unshaded, Group 2; Bruxzir shaded A2, Group 3; Bruxzir anterior white, Group 4; Bruxzir anterior shade A2, Group 5; Prettau unshaded, Group 6; Prettau shaded with A2 coloring liquid, Group 7; Prettau anterior white, Group 8; Prettau anterior shaded with A2 coloring liquid, Group 9; Katana HT white, Group 10; Katana HT shade A2, Group 11; Katana ST white, Group 12; Katana ST shade A2. All discs were milled using a dental milling machine, and had final dimensions after sintering of 15 mm diameter and 1 mm thickness. BFS was tested using piston on three ball technique. Results:  One-way ANOVA revealed significant differences among the 12 groups. Tukey post-hoc tests revealed no significant differences between the groups 3, 4, ,7 ,8 11, and 12. However, they all had BFS values that are significantly lower than all other groups. Group 2 showed statistically significant higher BFS values when compared to group 3,4, 7, 8, 11, and 12 while it showed statistically significant lower values when compared to groups 1, 5, 6, 9, and 10. Conclusion: Increase in the yttria content in zirconia led to a decrease in its BFS. Shading of zirconia did not have a significant effect on the final strength of zirconia. KeywordsDental ceramics; Dental esthetics; Flexural strength; Shaded zirconia. 

scholarly journals Flexural Strength of Monolithic Zirconia after Different Surface Treatments

2019 ◽  
Vol 10 (4) ◽  
pp. 264-269
Author(s):  
Hamid Neshandar Asli ◽  
Samiyeh Rahimabadi ◽  
Mehran Falahchai
Keyword(s):  
Flexural Strength ◽  
Surface Treatments ◽  
Monolithic Zirconia

scholarly journals Comparison of four monolithic zirconia materials with conventional ones: Contrast ratio, grain size, four-point flexural strength and two-body wear

2016 ◽  
Vol 59 ◽  
pp. 128-138 ◽  
Author(s):  
Bogna Stawarczyk ◽  
Kathrin Frevert ◽  
Andreas Ender ◽  
Malgorzata Roos ◽  
Beatrice Sener ◽  
...  
Keyword(s):  
Grain Size ◽  
Flexural Strength ◽  
Contrast Ratio ◽  
Monolithic Zirconia

scholarly journals Influence of Specimen Preparation and Test Methods on the Flexural Strength Results of Monolithic Zirconia Materials

Materials ◽  
2016 ◽  
Vol 9 (3) ◽  
pp. 180 ◽  
Author(s):  
Christine Schatz ◽  
Monika Strickstrock ◽  
Malgorzata Roos ◽  
Daniel Edelhoff ◽  
Marlis Eichberger ◽  
...  
Keyword(s):  
Flexural Strength ◽  
Test Methods ◽  
Specimen Preparation ◽  
Monolithic Zirconia

Effect of different treatments on the flexural strength of fully versus partially stabilized monolithic zirconia

2017 ◽  
Vol 118 (2) ◽  
pp. 216-220 ◽  
Author(s):  
Taiseer A. Sulaiman ◽  
Aous A. Abdulmajeed ◽  
Khalil Shahramian ◽  
Lippo Lassila
Keyword(s):  
Flexural Strength ◽  
Monolithic Zirconia

Effect of Polishing Systems on Surface Roughness and Topography of Monolithic Zirconia

2016 ◽  
Vol 41 (4) ◽  
pp. 417-423 ◽  
Author(s):  
CL Goo ◽  
AUJ Yap ◽  
KBC Tan ◽  
AS Fawzy
Keyword(s):  
Surface Roughness ◽  
Sem Images ◽  
Group 4 ◽  
Diamond Bur ◽  
Before And After ◽  
Monolithic Zirconia ◽  
Polishing Procedures ◽  
Group 5 ◽  
Group 2 ◽  
Post Hoc

SUMMARY This study evaluated the effect of different chairside polishing systems on the surface roughness and topography of monolithic zirconia. Thirty-five monolithic zirconia specimens (Lava PLUS, 3M ESPE) were fabricated and divided into five groups of seven and polished with the following: Group 1 (WZ)—Dura white stone followed by Shofu zirconia polishing kit; Group 2 (SZ)—Shofu zirconia polishing kit; Group 3 (CE)—Ceramiste porcelain polishers; Group 4 (CM)—Ceramaster porcelain polishers; and Group 5 (KZ)—Komet ZR zirconia polishers. All specimens were ground with a fine-grit diamond bur prior to polishing procedures to simulate clinical finishing. Baseline and post-polishing profilometric readings were recorded and delta Ra values (difference in mean surface roughness before and after polishing) were computed and analyzed using one-way analysis of variance and Scheffe post hoc test (p<0.05). Representative scanning electron microscopy (SEM) images of the ground but unpolished and polished specimens were acquired. Delta Ra values ranged from 0.146 for CE to 0.400 for KZ. Delta Ra values for KZ, WZ, and SZ were significantly greater than for CE. Significant differences in delta Ra values were also observed between KZ and CM. The SEM images obtained were consistent with the profilometric findings. Diamond-impregnated polishing systems were more effective than silica carbide–impregnated ones in reducing the surface roughness of ground monolithic zirconia.

Surface Characterization of Monolithic Zirconia Following Treatment with Different Polishing Techniques

2020 ◽  
Vol 980 ◽  
pp. 176-186
Author(s):  
Zhen Yu Tang ◽  
Xin Yi Zhao ◽  
Anderson T. Hara
Keyword(s):  
Phase Transformation ◽  
Surface Characterization ◽  
Point Of View ◽  
Xps Analysis ◽  
Diamond Bur ◽  
Before And After ◽  
Monolithic Zirconia ◽  
Polishing Procedures ◽  
Xrd Patterns

The purpose of this study was to evaluate the effects of different polishing techniques on the topographical features and phase transformation of monolithic zirconia. Four brands of zirconia were ground and polished using one of four systems. All zirconia specimens were ground with a fine-grit diamond bur (GB) prior to polishing procedures. The surface roughness and phase transition (XRD) were evaluated, and surface characterizations (SEM and XPS) were performed. The highest roughness was obtained with the Tob system. The strongest diffraction peak in the obtained XRD patterns was at 2θ=30.246°. No monoclinic phase change was found in any group. The XPS analysis showed that the atomic percentages of yttrium in the specimens of Cercon before and after polishing were the highest of any sample. All the polishing systems tested may not adversely affect the phase transformation of monolithic zirconia. The Tob system resulted in the highest roughness. The XPS analysis showed that grinding and polishing had some effects on the properties of zirconia from a microscopic point of view.

Does Diamond Stone Grinding Change the Surface Characteristics and Flexural Strength of Monolithic Zirconia?

2020 ◽  
Vol 45 (3) ◽  
pp. 318-326
Author(s):  
R Aliaga ◽  
LN Miotto ◽  
LM Candido ◽  
LMG Fais ◽  
LAP Pinelli
Keyword(s):  
Flexural Strength ◽  
Surface Morphology ◽  
Weibull Modulus ◽  
Rietveld Method ◽  
Surface Characteristics ◽  
Strength Test ◽  
X Ray ◽  
Dry Grinding ◽  
Monolithic Zirconia ◽  
Scanning Electron

SUMMARY Purpose: The present study evaluated the effect of grinding on the surface morphology, mean roughness, crystalline phase, flexural strength, and Weibull modulus of monolithic (MZ) and conventional (CZ) zirconias. Methods and Materials: CZ and MZ bars and square-shaped specimens were distributed into three subgroups, combining grinding (G) and irrigation (W) with distilled water: Ctrl (Control: no grinding, 20 × 4 × 1.2 mm and 12 × 1.2 mm), DG (dry grinding, 20 × 4 × 1.5 mm and 12 × 1.5 mm), and WG (grinding with irrigation, 20 × 4 × 1.5 mm and 12 × 1.5 mm). The grinding (0.3 mm) was performed on a standardized device using a low-rotation wheel-shaped diamond stone. The four-point flexural strength test was performed on the EMIC 2000 machine (5 KN, 0.5 mm/min). Scanning electron microscopy (SEM) was used to evaluate the surface morphology. An X-ray diffractometer (XRD) was used to obtain the crystalline structures that were analyzed by the Rietveld method. Flexural strength (FS) values were subjected to the Shapiro-Wilk test and two-way analysis of variance followed by the Tukey's test (for all tests, α=0.05). Results: Grinding, either with or without irrigation, did not change the FS of the MZ but increased the FS of the CZ. Both MZ and CZ showed similar morphologic patterns after grinding, and in the WG groups, the grinding was more aggressive. The MZ had greater monoclinic content in all groups; grinding without irrigation caused the smallest t→m transformation. Conclusion: The grinding, when necessary, should be carried out without irrigation for conventional and monolithic zirconias.

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