Flexural Strength of Various CAD/CAM Ceramic Materials
Alakkad, Layali.
2018
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Abstract: ABSTRACT Aim and Hypothesis: The aim of this in vitro study was to evaluate and compare the flexural strength of the recently introduced zirconia reinforced lithium silicate glassceramic with lithium disilicate and feldspathic ceramics, and to investigate the effect of various surface treatments on the fracture resistance of the tested materials. Materials and method: 120 specimens of ... read morethree types of CAD/CAM ceramic blocks were divided into three groups: zirconia-reinforced lithium silicate ZLS (Celtra Duo) for group (1), leucite-reinforced feldspar glass-ceramics LRF (IPS Empress1 CAD) for group (2), and lithium disilicate ceramics (LDS) (IPS e-max CAD) for group (3) (ø14.5 x 12.5 mm, thickness 1.5 mm). Specimens were randomized into four subgroups for each group. The first subgroup (A) did not receive any surface treatment, the second subgroup (B) received polishing only, the third subgroup (C) received glazing only, and the fourth subgroup (D) received both the polishing and glazing surface treatments. Biaxial flexural strength test was performed at a rate of 0.5 mm/min until failure occurred and biaxial flexural strength was calculated in MPa. Results: The study found that group (A, 2) showed the lowest value of biaxial flexural strength (FS) (89.34±25.30MPa) and group (D, 3) showed a significantly higher FS value of (365.38±52.52MPa) in comparison to control and polished A and B, which showed no statistically significant difference between each other (p=0.683), while subgroup C had no significant difference with subgroup D (p=0.145). vi There was a statistically significant difference detected among the material groups. Material 3 showed the highest FS and was significantly different (p<0.001) from both materials (1 and 2). Conclusion: For CAD/CAM materials, LDS has higher fracture resistance followed by ZLS, and the least mechanical strength was exhibited by LRF. Polished surface treatment was more prone to have a negative influence on the flexural strength. However, glazing combined with polishing had a significant effect on increasing the flexural strength of ceramics.
Thesis (M.S.)--Tufts University, 2018.
Submitted to the Dept. of Posthodontics.
Advisor: Ala Ali.
Committee: Matthew Finkelman, Aikatarini Kostagianni, and Aikatarini Papathanasiou.
Keyword: Dentistry.read less - ID:
- 7w62fm78s
- Component ID:
- tufts:24979
- To Cite:
- TARC Citation Guide EndNote
