scholarly journals Ultrastructure of Cement Lines

2013 ◽  
Vol 22 (4) ◽  
pp. 445-450 ◽  
Author(s):  
Hiroyuki Okada ◽  
Ryo Tamamura ◽  
Takeshi Kanno ◽  
Hiroshi Nakada ◽  
Saori Yasuoka ◽  
...  
Keyword(s):  
Cement Lines

Finite Element Modeling of Microcrack Growth in Cortical Bone

2011 ◽  
Vol 78 (4) ◽  
Author(s):  
Susan Mischinski ◽  
Ani Ural
Keyword(s):  
Fracture Toughness ◽  
Finite Element ◽  
Elastic Modulus ◽  
Crack Growth ◽  
Line Strength ◽  
Crack Deflection ◽  
Cement Line ◽  
Fracture Properties ◽  
Cement Lines ◽  
Microcrack Growth

Bone is similar to fiber-reinforced composite materials made up of distinct phases such as osteons (fiber), interstitial bone (matrix), and cement lines (matrix-fiber interface). Microstructural features including osteons and cement lines are considered to play an important role in determining the crack growth behavior in cortical bone. The aim of this study is to elucidate possible mechanisms that affect crack penetration into osteons or deflection into cement lines using fracture mechanics-based finite element modeling. Cohesive finite element simulations were performed on two-dimensional models of a single osteon surrounded by a cement line interface and interstitial bone to determine whether the crack propagated into osteons or deflected into cement lines. The simulations investigated the effect of (i) crack orientation with respect to the loading, (ii) fracture toughness and strength of the cement line, (iii) crack length, and (iv) elastic modulus and fracture properties of the osteon with respect to the interstitial bone. The results of the finite element simulations showed that low cement line strength facilitated crack deflection irrespective of the fracture toughness of the cement line. However, low cement line fracture toughness did not guarantee crack deflection if the cement line had high strength. Long cracks required lower cement line strength and fracture toughness to be deflected into cement lines compared with short cracks. The orientation of the crack affected the crack growth trajectory. Changing the fracture properties of the osteon influenced the crack propagation path whereas varying the elastic modulus of the osteon had almost no effect on crack trajectory. The findings of this study present a computational mechanics approach for evaluating microscale fracture mechanisms in bone and provide additional insight into the role of bone microstructure in controlling the microcrack growth trajectory.

The fibrillar structure of cement lines on resorbed root surfaces of human teeth

2000 ◽  
Vol 35 (4) ◽  
pp. 208-213 ◽  
Author(s):  
T. Yamamoto ◽  
T. Domon ◽  
S. Takahashi ◽  
R. Suzuki ◽  
M. N. Islam
Keyword(s):  
Fibrillar Structure ◽  
Human Teeth ◽  
Cement Lines ◽  
Root Surfaces

Bone tissue aging affects mineralization of cement lines

Bone ◽  
2018 ◽  
Vol 110 ◽  
pp. 187-193 ◽  
Author(s):  
Petar Milovanovic ◽  
Annika vom Scheidt ◽  
Kathrin Mletzko ◽  
George Sarau ◽  
Klaus Püschel ◽  
...  
Keyword(s):  
Bone Tissue ◽  
Cement Lines ◽  
Tissue Aging

Short Term Review of the De La Caffiniere Trapeziometacarpal Arthroplasty

1984 ◽  
Vol 9 (2) ◽  
pp. 185-188 ◽  
Author(s):  
A. C. AUGUST ◽  
R. M. COUPLAND ◽  
J. P. SANDIFER
Keyword(s):  
Rheumatoid Arthritis ◽  
Point Of View ◽  
Indication For Operation ◽  
Short Term ◽  
Review Time ◽  
Main Indication ◽  
Cement Lines

We present a short term review of twenty-one De La Caffinière trapezio-metacarpal prostheses inserted into twenty patients with an average review time of fifteen months. Only one case was of rheumatoid arthritis and the main indication for operation was pain. From a functional and symptomatic point of view the results are similar to other series with surgery for trapezio-metacarpal arthritis but due to cup loosening 24% have needed revision, 24% have loose cups and a further 19% have lucent cement lines around the cup. This review draws attention to the worrying frequency of loosening with this prosthesis.

Geometric Determinants to Cement Line Debonding and Osteonal Lamellae Failure in Osteon Pushout Tests

2004 ◽  
Vol 126 (3) ◽  
pp. 387-390 ◽  
Author(s):  
X. Neil Dong ◽  
X. Edward Guo
Keyword(s):  
Finite Element ◽  
Shear Failure ◽  
Bone Matrix ◽  
Element Model ◽  
Thin Specimen ◽  
Cement Line ◽  
Test Geometry ◽  
Dimensional Finite Element ◽  
Cement Lines ◽  
Secondary Osteons

Cement lines are the boundaries between secondary osteons and the surrounding interstitial bone matrix in cortical bone. The interfacial properties of cement lines have been determined by osteon pushout tests. However, distinctively different material properties were obtained when osteon pushout tests were performed under different test geometries. In the present study, an axisymmetric two-dimensional finite element model was used to simulate an osteon pushout test using the test geometry of actual experiments. The results indicated that shear failure within the osteonal lamellae would occur when the osteon pushout test was performed under the condition of a thick specimen and large supporting hole. On the other hand, cement line debonding occurred when the osteon pushout test was performed using a thin specimen and small supporting hole. The finite element results were consistent with previous experiments of osteon pushout tests under different test geometries. Furthermore, the finite-element results suggest that a smoothly curved punch would most likely cause debonding at the cement line instead of osteonal lamellae.

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