scholarly journals Effect of Die Spacer Thickness on the Fracture Resistance of CAD/CAM Lithium Disilicate Veneers on Maxillary First Premolars

2021 ◽  
Vol Volume 13 ◽  
pp. 223-230
Author(s):  
Sherine Mohamed Farag ◽  
Mona Mohamed Ghoneim ◽  
Rania Reda Afifi
Keyword(s):  
Fracture Resistance ◽  
Lithium Disilicate ◽  
Cad Cam ◽  
Spacer Thickness ◽  
Die Spacer

Fracture Resistance of CAD/CAM-Fabricated Lithium Disilicate MOD Inlays and Onlays with Various Cavity Preparation Designs

2018 ◽  
Vol 28 (2) ◽  
pp. e524-e529 ◽  
Author(s):  
Hyung-In Yoon ◽  
Paul J. Sohn ◽  
Sharon Jin ◽  
Hawazin Elani ◽  
Sang J. Lee
Keyword(s):  
Fracture Resistance ◽  
Lithium Disilicate ◽  
Cavity Preparation ◽  
Cad Cam

scholarly journals Fracture Resistance of New Metal-Free Materials Used for CAD-CAM Fabrication of Partial Posterior Restorations

Medicina ◽  
2020 ◽  
Vol 56 (3) ◽  
pp. 132
Author(s):  
Georgina García-Engra ◽  
Lucia Fernandez-Estevan ◽  
Javier Casas-Terrón ◽  
Antonio Fons-Font ◽  
Pablo Castelo-Baz ◽  
...  
Keyword(s):  
Hybrid Materials ◽  
Fracture Resistance ◽  
Lithium Disilicate ◽  
Lithium Silicate ◽  
Control Group ◽  
Test Machine ◽  
Occlusal Wear ◽  
Significant Difference ◽  
Computer Aided ◽  
Cad Cam

Background and Objectives: To evaluate in vitro the fracture resistance and fracture type of computer-aided design and computer-aided manufacturing (CAD-CAM) materials. Materials and Methods: Discs were fabricated (10 × 1.5 mm) from four test groups (N = 80; N = 20 per group): lithium disilicate (LDS) group (control group): IPS e.max CAD®; zirconium-reinforced lithium silicate (ZRLS) group: VITA SUPRINITY®; polymer-infiltrated ceramic networks (PICN) group: VITA ENAMIC®; resin nanoceramics (RNC) group: LAVA™ ULTIMATE. Each disc was cemented (following the manufacturers’ instructions) onto previously prepared molar dentin. Samples underwent until fracture using a Shimadzu® test machine. The stress suffered by each material was calculated with the Hertzian model, and its behavior was analyzed using the Weibull modulus. Data were analyzed with ANOVA parametric statistical tests. Results: The LDS group obtained higher fracture resistance (4588.6 MPa), followed by the ZRLS group (4476.3 MPa) and PICN group (4014.2 MPa) without statistically significant differences (p < 0.05). Hybrid materials presented lower strength than ceramic materials, the RNC group obtaining the lowest values (3110 MPa) with significant difference (p < 0.001). Groups PICN and RNC showed greater occlusal wear on the restoration surface prior to star-shaped fracture on the surface, while other materials presented radial fracture patterns. Conclusion: The strength of CAD-CAM materials depended on their composition, lithium disilicate being stronger than hybrid materials.

Comparison of Fracture Resistance for Chairside CAD/CAM Lithium Disilicate Crowns and Overlays with Different Designs

2021 ◽  
Author(s):  
Carlos Alberto Jurado ◽  
Zinaida Kaleinikova ◽  
Akimasa Tsujimoto ◽  
Daniel Alberto Cortes‐Trevino ◽  
Robert R. Seghi ◽  
...  
Keyword(s):  
Fracture Resistance ◽  
Lithium Disilicate ◽  
Cad Cam

scholarly journals Resistance to Fracture of Lithium Disilicate Feldspathic Restorations Manufactured Using a CAD/CAM System and Crystallized with Different Thermal Units and Programs

Materials ◽  
2021 ◽  
Vol 14 (12) ◽  
pp. 3215
Author(s):  
Cristian Abad-Coronel ◽  
Andrea Ordoñez Balladares ◽  
Jorge I. Fajardo ◽  
Benjamín José Martín Biedma
Keyword(s):  
Mechanical Properties ◽  
Fracture Resistance ◽  
Lithium Disilicate ◽  
Rapid Crystallization ◽  
Cad Cam ◽  
Ceramic Restorations

The aim of this study was to determine the resistance to fracture of feldspathic restorations with lithium disilicate and crystallized with different ovens and programs. Methods: Sixty monolithic restorations (LD) (EMAX CAD™ LT, Ivoclar-Vivadent™) were designed with the same parameters and milled with a CAD/CAM system (CEREC SW 5.1, CEREC MCXL, Dentsply-Sirona™, Bensheim). Each restoration was randomly assigned by randomization software (RANDNUM) to one of the three groups: a) (NF) Oven P310 (Ivoclar, Vivadent) normal crystallization program, b) (FF) Ivoclar P310 oven (Ivoclar-Vivadent™) rapid crystallization program, or c) (SF) SpeedFire oven (Dentsply-Sirona™). Results: There were statistically significant differences between the groups (ANOVA, p <0.05). The NF and FF groups showed the highest values of resistance to fracture, with statistically significant differences with the SF group. Conclusions: Using a furnace from the same dental company with predetermined programs from the material manufacturer, as well as using a predetermined program for rapid crystallization, has no effect on fracture resistance, and would save clinical time when performing ceramic restorations with lithium disilicate, while keeping their mechanical properties.

scholarly journals Evaluation of Fracture Resistance and Microleakage of Endocrowns with Different Intracoronal Depths and Restorative Materials Luted with Various Resin Cements

Materials ◽  
2019 ◽  
Vol 12 (16) ◽  
pp. 2528 ◽  
Author(s):  
Ouqba Ghajghouj ◽  
Simge Taşar-Faruk
Keyword(s):  
Computer Aided Design ◽  
Fracture Resistance ◽  
Failure Modes ◽  
Numerical Data ◽  
Lithium Disilicate ◽  
Load Test ◽  
Test Machine ◽  
Cavity Depth ◽  
Computer Aided ◽  
Cad Cam

The aim of this study was to determine the effect of restoration design on the fracture resistance of different computer-aided design/computer-aided manufacturing (CAD/CAM) ceramics and investigate the marginal leakage of endocrowns according to different types of cement. In total, 96 extracted mandibular first premolars were used for fabrication of endocrowns; 48 of the endocrowns were divided into 6 groups (n = 8) according to intracoronal cavity depth (2 and 3 mm) and CAD/CAM ceramics (lithium disilicate IPS e.max-CAD, zirconia-reinforced glass-ceramic Vita Suprinity, and poly-ether-ether-ketone (PEEK)). Teeth were subjected to a fracture resistance test with a universal test machine following thermo-cycling. Failure modes were determined by stereomicroscope after the load test. The rest of the endocrowns (n = 48) were produced by Vita Suprinity ceramic and divided into 6 groups (n = 8) according to the cement used (Panavia V5, Relyx Ultimate, and GC cement) with intracoronal cavity depths of 2 and 3 mm. Microleakage tests were performed using methylene blue with stereomicroscope after thermo-cycling. Numerical data for both fracture resistance and microleakage tests were obtained and evaluated by three-way ANOVA. PEEK endocrowns had higher fracture resistance compared to lithium disilicate and Vita Suprinity. Panavia V5 cement had the lowest degree of microleakage, while GC cement had the highest. Different intracoronal cavity depths had no correlation with fracture resistance and microleakage.

scholarly journals Fracture Resistance of CAD/CAM Lithium Disilicate of Endodontically Treated Mandibular Damaged Molars Based on Different Preparation Designs

2019 ◽  
Vol 2019 ◽  
pp. 1-7 ◽  
Author(s):  
Carolina Clausson ◽  
Cristiano Clausson Schroeder ◽  
Paulo Vicenti Goloni ◽  
Flavio Artur Rego Farias ◽  
Leandro Passos ◽  
...  
Keyword(s):  
Fracture Mode ◽  
Fracture Resistance ◽  
Lithium Disilicate ◽  
Fracture Pattern ◽  
Pulp Chamber ◽  
Complete Filling ◽  
Crown Root ◽  
All Ceramic ◽  
Cad Cam ◽  
Ceramic Crowns

The aim of this study was to evaluate the fracture resistance of 2 different types of all-ceramic crown using immediate dentin sealing (IDS), obtained using a CAD/CAM system on molars with different preparations. Forty extracted lower molars were endodontically treated and divided into four groups (n = 10) according to the dental preparation. Group 1 (SP0) was prepared without filling the pulp chamber and crown-root junction was located at the cementoenamel junction (CEJ). Group 2 (SP1) was prepared without filling the pulp chamber and crown-root junction was located 1-mm above the CEJ. Groups 3 and 4 contained a flat preparation surface with no axial wall height. Group 3 (CP0) was made IDS with complete filling of the pulp chamber with composite resin and crown-root junction was located at the CEJ. Group 4 (CP1) was prepared with complete filling of the pulp chamber and crown-root junction was located 1-mm above the CEJ. All groups were restored with CAD/CAM lithium disilicate ceramic crowns. Specimens were subjected to the fracture test and statistically analyzed using analysis of variance (ANOVA). Fracture mode was determined using a stereoscopic microscope, classified as repairable or nonrepairable, and analyzed using Fischer’s exact test. Results indicated that there were no significant differences between the groups in terms of fracture resistance or fracture pattern (p >0.05). Fracture resistance was the lowest in the SP0 group, followed by the SP1 group (1634.38 N) of CP0 (1821.50 N), and it was the highest in the CP1 group. There was a predominance of nonrepairable fractures and there were no significant differences in the fracture resistance and fracture mode of CAD/CAM lithium disilicate molar all-ceramic crowns. Endodontically treated molars teeth might be restored with endocrowns or all-ceramic crowns on flat preparation; however tooth fracture failures that affect reliability of these types of restorations should be considered.

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