The effect of fiber insertion on fracture strength and fracture modes in endocrown and overlay restorations

Four sorts of zirconia dental ceramic systems including Cercon smart, Lava, Porcera, and CEREC 3 were studied to analyze fracture mechanism of different CAD/CAM zirconia ceramic. In each system, 12 sectioned specimens were prepared, 6 specimens were taken as controlled group, 6 as experimental group. Quasi-statistic loading before and after cyclic loading was applied at the veneer surface of the specimen. Deformation and crack initiation were monitored with camera in order to carry out digital image correlation (DIC) analysis. The results showed that median cracks were observed under the yielding zone. Specimens fractured along the core/veneer interface with the crack growth. No cone crack was confirmed and fracture only existed in veneer layer. After cyclic loading there were no significant differences for the four ceramic systems in terms of the critical load, while significant differences existed in terms of the fracture load. Both critical load and fracture load were lowered after cyclic loading. After cycling loading, the 4 tested zirconia CAD/CAM ceramic possess high fracture strength to meet the requirement for oral functions. The fracture modes of the four zirconia ceramic systems indicate that the strength of the veneer should be enhanced.

Download Full-text

Effect of location of glass fiber pre-impregnated with light-curing resin on the fracture strength and fracture modes of a maxillary complete denture

The Journal of Korean Academy of Prosthodontics ◽

10.4047/jkap.2012.50.4.279 ◽

2012 ◽

Vol 50 (4) ◽

pp. 279 ◽

Cited By ~ 1

Author(s):

Hyun-Sang Yoo ◽

Su-Jin Sung ◽

Jae-Young Jo ◽

Do-Chan Lee ◽

Jung-Bo Huh ◽

...

Keyword(s):

Glass Fiber ◽

Fracture Strength ◽

Complete Denture ◽

Fracture Modes ◽

Light Curing

Download Full-text

In vitro fracture strength and modes of cast post and cores luted with self-adhesive resin-based cement

Brazilian Journal of Oral Sciences ◽

10.20396/bjos.v18i0.8657261 ◽

2019 ◽

Vol 18 ◽

pp. e191635

Author(s):

Marcos C Pomini ◽

Marina M Machado ◽

Giovanny de Paula Quadros ◽

Lidia O B Pinheiro ◽

Adriana P B Samra

Keyword(s):

Fracture Strength ◽

Fracture Resistance ◽

Zinc Phosphate ◽

Adhesive Resin ◽

Fracture Modes ◽

Universal Machine ◽

Biomechanical Behavior ◽

Post And Core

Aim: Cast post and core (CPC) is the main used post type; however, the biomechanical behavior of CPCs adhesively luted to the dentin is still unclear. Therefore, we aimed to evaluate the fracture resistance (FR) and fracture modes of teeth restored with CPCs luted with zinc-phosphate (ZP) or resin-based self-adhesive (SA) cements, as well as the influence of the coronal remnant. Methods: For that, 24 human premolars were divided into four groups according to the cement (ZP or SA) and coronal remnant (with or without 2mm). FR was tested in a universal machine and data analyzed by two-way ANOVA and Tukey HSD (α=.05). Fracture modes were classified according to the degree of dental destruction. Results: The results showed that there was no difference in FR (p=.352); however, teeth without ferrule presented more irreparable fractures, specially in the ZP group. Conclusion: All in all, self-adhesion of CPCs does not enhance fracture resistance, however it reduces the number of irreparable fractures, compared to ZP cement.

Download Full-text

Mechanical Properties and Fracture Characteristics of Zr-Based Bulk Metallic Glass Composites Containing Carbon Nanotube Addition

Journal of Materials Research ◽

10.1557/jmr.2004.0140 ◽

2004 ◽

Vol 19 (4) ◽

pp. 1068-1076 ◽

Cited By ~ 3

Author(s):

Zan Bian ◽

Tao Zhang ◽

Hidemi Kato ◽

Masashi Hasegawa ◽

Akihisa Inoue

Keyword(s):

Mechanical Properties ◽

Carbon Nanotube ◽

Metallic Glass ◽

Bulk Metallic Glass ◽

Interfacial Reaction ◽

Fracture Strength ◽

Volume Fraction ◽

Fracture Characteristics ◽

Glass Composites ◽

Fracture Modes

Mechanical properties and fracture characteristics of Zr-based bulk metallic glass (BMG) composites containing carbon nanotube (CNT) addition were investigated in detail. The interfacial reaction between the added CNTs and the glass matrix causes the formation of some V-shape nicks on the residual CNTs. These nicks have significant effect on the mechanical properties and fracture modes of the BMG composites. The compressive fracture strength increases with increasing the volume fraction of CNT addition at first, and starts to decrease gradually when the volume fraction of CNT addition is more than 5.0%. The fracture modes of the BMG composites also change from typical shear flow deformation behavior to completely embrittling fracture gradually. The V-shape nicks originating from the interfacial reaction are responsible for the decrease of fracture strength and the variation of fracture modes.

Download Full-text