scholarly journals Effect of Loading Angles and Implant Lengths on the Static and Fatigue Fractures of Dental Implants

Materials ◽  
2021 ◽  
Vol 14 (19) ◽  
pp. 5542
Author(s):  
Fei Sun ◽  
Li-Tao Lv ◽  
Wei Cheng ◽  
Jia-Le Zhang ◽  
De-Chun Ba ◽  
...  
Keyword(s):  
Fatigue Life ◽  
Dental Implants ◽  
Failure Load ◽  
Bending Moment ◽  
Fracture Morphology ◽  
Exponential Decrease ◽  
Life Tests ◽  
Static Fracture ◽  
Fracture Tests ◽  
Static Failure

Mechanical properties play a key role in the failure of dental implants. Dental implants require fatigue life testing before clinical application, but this process takes a lot of time. This study investigated the effect of various loading angles and implant lengths on the static fracture and fatigue life of dental implants. Implants with lengths of 9 mm and 11 mm were prepared. Static fracture tests and dynamic fatigue life tests were performed under three loading angles (30°, 40°, and 50°), and the level arm and bending moment were measured. After that, the fracture morphology and fracture mode of the implant were observed. The results showed that 9 mm length implants have a higher static failure load and can withstand greater bending moments, while 11 mm length implants have a longer fatigue life. In addition, as the loading angle increases, the static strength and bending moment decrease linearly, and the fatigue life shows an exponential decrease at a rate of three times. Increasing the loading angle reduces the time of the implant fatigue test, which may be an effective method to improve the efficiency of the experiment.

Effect of Roughness on Fatigue Life of Open Holes

2007 ◽  
Vol 348-349 ◽  
pp. 757-760 ◽  
Author(s):  
Yong Shou Liu ◽  
Jun Liu ◽  
Xiao Jun Shao ◽  
Zhu Feng Yue
Keyword(s):  
Surface Roughness ◽  
Fatigue Life ◽  
Fatigue Testing ◽  
Fracture Morphology ◽  
Internal Crack ◽  
Corner Crack ◽  
Fatigue Lifetime ◽  
Crack Type ◽  
Open Hole ◽  
Scanning Electron

The fatigue testing of the specimen with a central open hole was carried out to investigate the influence of the surface roughness on the fatigue lifetime. Fracture morphology investigations were used by scanning electron microscope. The reliability analysis of the specimen was carried out by detail fatigue rating. The results revealed that the less the roughness is, the longer the fatigue life of open hole and the higher the value of DFR (Detail Fatigue Rating) is. Under the same technological conditions, the effect of corner crack on fatigue life of open holes is greater than the effect of internal crack. So, the effect of a decrease of roughness on the fatigue life of an open hole is similar to a change of crack type from a corner crack to an internal crack.

Quasi-Static Fracture Tests

2012 ◽  
pp. 163-271 ◽  
Author(s):  
Raymond A. Pearson ◽  
Bamber R. K. Blackman ◽  
Raul D. S. G. Campilho ◽  
Marcelo F. S. F. de Moura ◽  
Nuno M. M. Dourado ◽  
...  
Keyword(s):  
Static Fracture ◽  
Fracture Tests

A comprehensive review of factors affecting fatigue life of dental implants

2020 ◽  
Author(s):  
Chinmay Gherde ◽  
Pankaj Dhatrak ◽  
Shriya Nimbalkar ◽  
Srujana Joshi
Keyword(s):  
Fatigue Life ◽  
Dental Implants ◽  
Comprehensive Review ◽  
Factors Affecting

203 A study on static fracture strength and fracture morphology in CFRP adhesive/bolt joint

2009 ◽  
Vol 2009.58 (0) ◽  
pp. 81-82
Author(s):  
Hiroaki KYUNO ◽  
Takamasa OKOCHI ◽  
Keiichiro TOHGO ◽  
Yoshinobu SHIMAMURA ◽  
Hiroyasu ARAKI
Keyword(s):  
Fracture Strength ◽  
Fracture Morphology ◽  
Static Fracture

Tensile and Fatigue Failure of 17-4 PH Martensitic Stainless Steels in Presence of Hydrogen Depending on Frequency and Heat Treatment

2020 ◽  
Author(s):  
Jean-Gabriel Sezgin ◽  
Junichiro Yamabe
Keyword(s):  
Fatigue Life ◽  
Hydrogen Gas ◽  
Relative Reduction ◽  
Low Alloy Steels ◽  
Notched Specimen ◽  
Acceleration Ratio ◽  
Paris Law ◽  
Alloy Steels ◽  
Life Tests ◽  
Surface Morphologies

Abstract Slow-strain-rate tensile (SSRT) and fatigue-life tests were carried out on 17-4PH martensitic stainless steel with an ultimate tensile strength (UTS) of ∼ 1 GPa. The specimens were precharged by exposure to hydrogen gas at pressures of 35 MPa or 100 MPa at 270°C for 200 h. The SSRT tests used smooth axisymmetric specimens made of two grades of 17-4PH (H1150 and H900) differing by the UTS due to their thermal history. No degradation of the UTS was observed for both H1150 and H900 grades. However, the relative reduction in area (RRA) was 0.31 for H1150 or 0.11 for H900, translating a difference in their hydrogen sensitivity. Both grades presented different fracture-surface morphologies: a mixture of quasi-cleavage (QC) and intergranular (IG) facets for H1150 and cleavage (C) facets for H900. Circumferentially-notched axisymmetric specimens made of H1150 were used for the fatigue-life tests in the [10−3 Hz;10 Hz] frequency range. Our previous study on low-alloy steels with UTS of around 950 MPa demonstrates that the fatigue life of a circumferentially-notched specimen with a sharp notch can be successfully predicted from the fatigue crack growth (FCG) property following the Paris law. This study used the same specimen geometry and a BCC steel with a similar UTS value; hence, the FCG behavior was investigated from the fatigue-life test of the notched specimen. As a result, the degradation of fatigue lives attributed to the FCG acceleration was observed in presence of hydrogen. A FCG acceleration ratio bounded to 30 was observed in the high-cycle regime, accompanied by QC facets. A FCG acceleration ratio bounded to ∼100 was observed in the low-cycle regime, accompanied by QC and IG facets. A FCG model accounting for the interaction of elementary mechanisms was proposed and succeeded in predicting the FCG acceleration ratio observed on H1150. This model was also successfully applied to a low-alloy steel with a comparable UTS (1002 MPa) tested in gaseous hydrogen.

Comparison of the Experimental Results of the Calculation for Various Models of the Energy Parameter

2016 ◽  
Vol 250 ◽  
pp. 127-132
Author(s):  
Ewa Marcisz ◽  
Dariusz Rozumek
Keyword(s):  
Fatigue Life ◽  
Cross Section ◽  
Energy Parameter ◽  
Experimental Results ◽  
Elastic Model ◽  
Linear Elastic ◽  
Linear Elastic Model ◽  
Life Tests

The paper presents results of fatigue life tests conducted on transverse, circular and square cross-section specimens of C45 steel with controlled amplitude of energy parameter. The experimental results were compared with results obtained from computations on energy parameter models by R. Pawliczek, C. T. Lachowicz and on the linear-elastic model.

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