Fracture Strength After Fatigue Loading of Lithium Disilicate Pressed Zirconia Crowns

2016 ◽  
Vol 29 (4) ◽  
pp. 369-371 ◽  
Author(s):  
So-Yeun Kim ◽  
Jae-Won Choi ◽  
Sung-Won Ju ◽  
Jin-Soo Ahn ◽  
Mi-Jung Yoon ◽  
...  
Keyword(s):  
Fracture Strength ◽  
Fatigue Loading ◽  
Lithium Disilicate ◽  
Zirconia Crowns

The Effect of Thickness on the Fracture Strength and Failure Modes of Zirconia Crowns

2016 ◽  
Vol 697 ◽  
pp. 629-632
Author(s):  
Li Xian Zhang ◽  
Rui Li ◽  
Yu Niu ◽  
Yu Xiao Liu
Keyword(s):  
Fracture Strength ◽  
Failure Modes ◽  
Statistical Significance ◽  
Dental Practice ◽  
Significant Difference ◽  
Cad Cam ◽  
Zirconia Crowns ◽  
Different Thickness

To explore the effect of thickness on the fracture strength and failure modes of zirconia crowns, four crown models with different thickness (1.2 mm, 1.0 mm, 0.8 mm, 0.6 mm) with the same shape were designed by Dental Designer software in CAD/CAM system. They were manufactured to 40 zirconia crowns by CAM carving machine. The fracture strength and the failure modes of each crown was measured, while porcelain fused to metal (PFM) crowns as control. The average fracture strength of different zirconia crowns were recorded as below: 1308.38 ± 111.38 N (Group 0.6 mm), 1841.60 ± 68.21 N (Group 0.8 mm), 2429.88 ± 315.03 N (Group 1.0 mm), 3068.31 ± 233.88 N (Group 1.2 mm). There was no significant difference between Group 1.0 mm and Group 1.2 mm (P > 0.05), and statistical significance was obtained among every other two groups (P < 0.05). The failure modes of different thickness zirconium crowns are similar. There are more broken pieces from thicker crowns compared to thinner ones. It is concluded that the thickness can influence the fracture strength of zirconia crown. With the increase of the thickness, the fracture strength of the zirconium crowns also increases. We recommend zirconia crowns thicker than or at least 1.0 mm in dental practice.

Bond Strength and Microleakage of Different Designs of Occlusal Veeners

2021 ◽  
Vol 19 (1) ◽  
pp. 62-66
Author(s):  
Mohamed G. Hussein ◽  
Cherif A. Mohsen
Keyword(s):  
Standard Deviation ◽  
Bond Strength ◽  
Fracture Strength ◽  
Lithium Disilicate ◽  
Mean Value ◽  
P Value ◽  
Finish Line ◽  
Nonsignificant Difference ◽  
Diamond Saw ◽  
Line Design

The purpose of this study was to investigate fracture strength of different lithium disilicate occlusal veneers designs with different tooth preparations. Material and method: Fifty-six extracted human mandibular molars were collected with relatively comparable size and standardization done by diamond saw and it will receive. 6mm lithium disilicate occlusal veneers. Specimens will be divided into two main groups, each of these groups contains 28 samples (group A&B), the first group represents occlusal veneers with 1.0 ml with radial shoulder finish line design includes axial surfaces for a2 ml length, while the second group represents occlusal veneers preparation without finish line. Each main group will be subdivided into 2 subtypes groups (A1, A2, B1, B2), each subtype group contains 14 samples, the first subtype group will receive a buccal groove, while the second subgroup will be without grooves. Each subgroup will be divided into 2 classes (7 samples) according to the type of test it will be subjected to: microleakage, bond strength. Results: The fracture strength is (mean value+ standard deviation) in plain occlusal reduction without vs with buccal groove(890.36±42.51N), (865.69±36.79N). The fracture strength is (mean value ± standard deviation) in occlusal reduction with radial shoulder, without or with buccal groove (835.36±42.51N), (820.69±36.79N), with nonsignificant difference p value <0.05. Conclusions: All tested occlusal veneer designs proved to withstand normal and parafunctional masticatory forces with non-significant statistical difference.

scholarly journals Effect of immediate dentine sealing on the aging and fracture strength of lithium disilicate inlays and overlays

2020 ◽  
Vol 110 ◽  
pp. 103906 ◽  
Author(s):  
Jelte W. Hofsteenge ◽  
Femke Hogeveen ◽  
Marco S. Cune ◽  
Marco M.M. Gresnigt
Keyword(s):  
Fracture Strength ◽  
Lithium Disilicate

scholarly journals In-vitroperformance and fracture strength of thin monolithic zirconia crowns

2018 ◽  
Vol 10 (2) ◽  
pp. 79 ◽  
Author(s):  
Paul Weigl ◽  
Anna Sander ◽  
Yanyun Wu ◽  
Roland Felber ◽  
Hans-Christoph Lauer ◽  
...  
Keyword(s):  
Fracture Strength ◽  
Zirconia Crowns ◽  
Monolithic Zirconia

scholarly journals Effect of immediate dentine sealing on the fracture strength of lithium disilicate and multiphase resin composite inlay restorations

2017 ◽  
Vol 72 ◽  
pp. 102-109 ◽  
Author(s):  
Carline R.G. van den Breemer ◽  
Mutlu Özcan ◽  
Marco S. Cune ◽  
Rianne van der Giezen ◽  
Wouter Kerdijk ◽  
...  
Keyword(s):  
Fracture Strength ◽  
Resin Composite ◽  
Lithium Disilicate ◽  
Composite Inlay

Fracture Strength and Fracture Patterns of Root-filled Teeth Restored With Direct Resin Composite Restorations Under Static and Fatigue Loading

2014 ◽  
Vol 39 (2) ◽  
pp. 181-188 ◽  
Author(s):  
NA Taha ◽  
JE Palamara ◽  
HH Messer
Keyword(s):  
Fracture Strength ◽  
Resin Composite ◽  
Glass Ionomer Cement ◽  
Fatigue Loading ◽  
Test System ◽  
Fracture Load ◽  
Composite Restorations ◽  
Fracture Patterns ◽  
Lower Load ◽  
Number Of Cycles

SUMMARY Aim To assess fracture strength and fracture patterns of root-filled teeth with direct resin composite restorations under static and fatigue loading. Methodology MOD cavities plus endodontic access were prepared in 48 premolars. Teeth were root filled and divided into three restorative groups, as follows 1) resin composite; 2) glass ionomer cement (GIC) core and resin composite; and 3) open laminate technique with GIC and resin composite. Teeth were loaded in a servohydraulic material test system. Eight samples in each group were subjected to stepped fatigue loading: a preconditioning load of 100 N (5000 cycles) followed by 30,000 cycles each at 200 N and higher loads in 50-N increments until fracture. Noncycled teeth were subjected to a ramped load. Fracture load, number of cycles, and fracture patterns were recorded. Data were analyzed using two-way analysis of variance and Bonferroni tests. Results Fatigue cycling reduced fracture strength significantly (p&lt;0.001). Teeth restored with a GIC core and a laminate technique were significantly weaker than the composite group (379±56 N, 352±67 N vs 490±78 N, p=0.001). Initial debonding occurred before the tooth underwent fracture. All failures were predominantly adhesive, with subcrestal fracture of the buccal cusp. Conclusions Resin composite restorations had significantly higher fracture strength than did other restorations. Fatigue cycled teeth failed at lower load than did noncycled teeth.

Fracture Strength and Precision of Fit of Implant-Retained Monolithic Zirconia Crowns

2018 ◽  
Vol 44 (5) ◽  
pp. 330-334 ◽  
Author(s):  
Pauliina Moilanen ◽  
Jenni Hjerppe ◽  
Lippo V. J. Lassila ◽  
Timo O. Närhi
Keyword(s):  
Fracture Strength ◽  
Computer Aided Design ◽  
Testing Machine ◽  
Implant Surface ◽  
Computer Aided ◽  
Cad Cam ◽  
Zirconia Crowns ◽  
Failure Loads ◽  
Monolithic Zirconia ◽  
Aided Design

New monolithic zirconia materials can be used to fabricate full-contour fixed dental prostheses with the computer-aided design/computer-aided manufacturing (CAD/CAM) method. The aim of this study was to examine the fracture strength and precision of fit of screw-retained monolithic zirconia crowns made directly on implants or by cementing on prefabricated titanium (Ti) bases. Monolithic screw-retained implant crowns (n = 6) were produced by CAD/CAM method using partially (PSZ) and fully stabilized (FSZ) zirconia. Industrially produced zirconia crowns were used as a reference. A lateral incisor study model was made onto an implant replica. Crowns were produced either directly on the implant or through cementing on a prefabricated titanium base (PSZ+Ti, FSZ+Ti). The crowns were tightened to implant replicas with a torque of 35 Ncm. The gap between the replica and the abutment or crown was measured from ×400 scanning electron microscope images for precision of fit. Mechanical testing until failure was completed with a universal testing machine with loading angle of 45°. Statistical analysis was performed (analysis of variance). Mean (±SD) failure loads were 259 ± 23 (PSZ), 140 ± 13 (FSZ), 453 ± 25 (PSZ+Ti), 439 ± 41 (FSZ+Ti), and 290 ± 39 (Procera). Mean (±SD) gap values were 2.2 ± 0.2 (PSZ), 2.5 ± 1.0 (FSZ), 7.0 ± 1.0 (PSZ+Ti), 7.7 ± 1.6 (FSZ+Ti), and 6.7 ± 1.7 (Procera). Monolithic zirconia crowns with a Ti base clearly show higher fracture strengths than the crowns fixed directly on the implant surface. Better marginal fit can be achieved with direct zirconia crowns than with crowns on a titanium base or industrially produced zirconia crowns.

scholarly journals Fracture strength of lithium disilicate cantilever resin bonded fixed dental prosthesis

2020 ◽  
Vol 103 ◽  
pp. 103615
Author(s):  
Marco M.M. Gresnigt ◽  
Gil Tirlet ◽  
Mariana Bošnjak ◽  
Stephan van der Made ◽  
Jean-Pierre Attal
Keyword(s):  
Fracture Strength ◽  
Lithium Disilicate ◽  
Dental Prosthesis ◽  
Fixed Dental Prosthesis
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