Investigation of viscoelastoplastic response of bone tissue in oral implants press fit process

2009 ◽  
Vol 91B (2) ◽  
pp. 868-875 ◽  
Author(s):  
Arturo N. Natali ◽  
Emanuele L. Carniel ◽  
Piero G. Pavan
Keyword(s):  
Bone Tissue ◽  
Oral Implants ◽  
Press Fit

scholarly journals Biomechanical assessment of the stability of osteochondral grafts implanted in porcine and bovine femoral condyles

2019 ◽  
Vol 234 (2) ◽  
pp. 163-170 ◽  
Author(s):  
Philippa Bowland ◽  
Raelene M Cowie ◽  
Eileen Ingham ◽  
John Fisher ◽  
Louise M Jennings
Keyword(s):  
Bone Tissue ◽  
Cartilage Damage ◽  
Primary Stability ◽  
Preparation Technique ◽  
Recipient Site ◽  
Osteochondral Grafts ◽  
Press Fit ◽  
Bone Properties ◽  
The Stability ◽  
Push Out

Osteochondral grafts are used clinically to repair cartilage and bone defects and to restore the congruent articulating surfaces of the knee joint following cartilage damage or injury. The clinical success of such osteochondral grafts is heavily reliant on the biomechanical and tribological properties of the surgical repair; however, a limited number of studies have investigated these factors. The aim of this study was to evaluate the influence of graft harvesting and implantation technique as well as bone properties on the primary stability of press-fit implanted osteochondral grafts using a series of uniaxial experimental push-in and push-out tests. Animal (porcine and bovine) knees were used to deliver models of different bone properties (elastic modulus and yield stress). The study showed the graft harvesting method using either a chisel or drill-aided trephine to have no influence on primary graft stability; however, the preparation technique for the graft recipient site was shown to influence the force required to push the graft into the host tissue. For example, when the length of the graft was equal to the recipient site (bottomed), the graft was more stable and dilation of the recipient site was shown to reduce short-term graft stability especially in immature or less dense bone tissue. The push-out tests which compared tissue of different skeletal maturities demonstrated that the maturity of both the graft and host bone tissue to influence the stability of the graft. A higher force was required to push out more skeletally mature grafts from mature bone tissue. The study demonstrates the importance of surgical technique and bone quality/properties on the primary stability and ultimately, the success of osteochondral grafts in the knee.

The Use of Microfocus Computerized Tomography as a New Technique for Characterizing Bone Tissue Around Oral Implants

2000 ◽  
Vol 26 (1) ◽  
pp. 5-12 ◽  
Author(s):  
H. Van Oosterwyck ◽  
J. Duyck ◽  
J. Vander Sloten ◽  
G. Vander Perre ◽  
J. Jansen ◽  
...  
Keyword(s):  
Bone Tissue ◽  
Computerized Tomography ◽  
New Technique ◽  
Oral Implants ◽  
A New Technique

Sternal augmentation plasty utilizing homologous bone tissue after Fontan operation

2010 ◽  
Vol 58 (S 01) ◽  
Author(s):  
W Kuroczynski ◽  
C Kampmann ◽  
R Huth ◽  
M Hartert ◽  
M Heinemann ◽  
...  
Keyword(s):  
Bone Tissue ◽  
Fontan Operation

Drilling and plombage (core decompression) of a femoral head avascular necrosis

2010 ◽  
Vol 19 (01) ◽  
pp. 36-39 ◽  
Author(s):  
P. Chládek ◽  
V. Havlas ◽  
T. Trc
Keyword(s):  
Surgical Treatment ◽  
Femoral Head ◽  
Core Decompression ◽  
Effective Treatment Option ◽  
Simple Method ◽  
X Ray ◽  
Large Femoral Head ◽  
Press Fit ◽  
Round Shape ◽  
Late Stages

SummaryThe treatment of femoral head necrosis of adults is still rather problematic. Conservative treatment has been reported relatively unsuccessful and surgical treatment does not show convincing results either. The most effective seems to be a surgical treatment in early stages of the disease, however, the diagnosis still remains relatively complicated. For the late stages (2B and above) the most effective treatment option is represented by core decompression and vascular grafting. However, drilling and plombage (especially when using press-fit technique) seems to be successful, although not excellent. The authors describe their own method of drilling and plombage of the necrotic zone of the femoral head in 41 patients with X-ray detected necrotic changes of the femoral head. The pain measured by VAS was seen to decrease after surgery in all patients significantly. The Jacobs score was also observed to have increased (from fair to good outcome). We have not observed any large femoral head collapse after surgery, moreover, in some cases an improvement of the round shape of the femoral head was seen. It is important to mention that in all cases femoral heads with existing necrotic changes (flattening or collapse) were treated. Although the clinical improvement after surgery was not significantly high, the method we describe is a safe and simple method of diminishing pain in attempt to prepare the femoral head for further treatment in a future, without significant restriction of the indication due to necrosis (osteochondroplasty, resurfacing, THR).

Mid-term results of a cementless primary press-fit cup in acetabular revision surgery

2020 ◽  
Author(s):  
N Kolbe ◽  
B Zimmer ◽  
P Matheis ◽  
M Streit ◽  
T Gotterbarm ◽  
...  
Keyword(s):  
Revision Surgery ◽  
Acetabular Revision ◽  
Press Fit ◽  
Mid Term Results

Mineral composition and gemological characteristics of the fossil marine reptiles of the Ulyanovsk region

2018 ◽  
pp. 12-16 ◽  
Author(s):  
D. A. Petrochenkov
Keyword(s):  
Chemical Composition ◽  
Bone Tissue ◽  
Mineral Composition ◽  
Bone Structure ◽  
Upper Jurassic ◽  
Marine Reptiles ◽  
Ulyanovsk Region ◽  
Impurity Elements ◽  
Wide Assortment

Fossils of marine reptiles are a new jewelry and ornamental material and collected in the Ulyanovsk region from the Upper Jurassic deposits. They consist of (wt. %): calcite — 52, apatite — 24 and pyrite — 23, and also gypsum presents. The contents of radioactive and carcinogenic elements are close to background. The original bone structure of reptiles is preserved. Apatite replaces the bone tissue of marine reptiles, forming a cellular framework. According to the chemical composition, apatite refers to fluorohydroxyapatite with an increased Sr content. The size of the crystals is finely-dispersed. Calcite and pyrite fill the central parts of the cells. Calcite crystals of isometric and elongated shape, 0,01—0,05 mm in size, form blocks up to 0,3 mm during intergrowth. Calcite fills thin, discontinuous veins along the contour of cells with a width of up to 0,03 mm. In calcite, among the impurity elements, there are (wt. %, on the average): Mg — 0,30, Mn — 0,39 and Fe — 0,96. Pyrite forms a dispersed impregnation in calcite and apatite, content of impurities is, wt. %: Ni — up to 0,96 and Cu — up to 0,24. On technological and decorative characteristics of fossils of sea reptiles of Ulyanovsk region are qualitative jewelry and ornamental materials of biomineral group, allowing to make a wide assortment of jewelry and souvenir products.

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