Test Method for Determining Axial Pull-Out Strength of Medical Bone Screws

10.1520/f1691 ◽  
2001 ◽  
Author(s):  
Keyword(s):  
Bone Screws ◽  
Test Method ◽  
Pull Out ◽  
Pull Out Strength

Axial pull-out strength of 3.5 cortical and 4.0 cancellous bone screws placed in canine proximal tibias using manual and power tapping

2008 ◽  
Vol 21 (04) ◽  
pp. 323-328 ◽  
Author(s):  
M. E. Soniat ◽  
S. Elder ◽  
R. McLaughlin ◽  
J. L. Demko
Keyword(s):  
Cancellous Bone ◽  
Testing Machine ◽  
Bone Screws ◽  
Materials Testing ◽  
Pull Out ◽  
Cortical Width ◽  
Bone Width ◽  
Significant Difference ◽  
Pull Out Strength

SummaryAn in vitro experimental cadaveric mechanical testing study was performed using 20 radiographically mature dogs, weighing between 18–33 kg. The aim of the study was to compare the axial pull-out strength of 3.5 mm cortical and 4.0 mm cancellous bone screws inserted in the canine proximal tibia using manual and power tapping techniques. 3.5 cortical and 4.0 cancellous bone screws were inserted in canine cadaver proximal tibiae using a manual or power tapping technique. The screws were extracted using a servohydraulic materials testing machine in order to measure axial pullout strength. Axial pull-out strength was recorded relative to the total bone width and total cortical width of each tibia. The mean axial pull-out strength for all constructs was 717.8±56.5 N without any statistically significant difference among groups (p=0.4183). The groups were equal in animal body weight, cortical width and total bone width (p=0.2808). The axial pull-out strength in proportion to cortical and total bone width was not significantly different among groups (p=0.5318). Axial pull-out strengths of 3.5 mm cortical and 4.0 mm cancellous bone screws inserted in the proximal tibial metaphysis were not significantly different. Axial pull-out strength was not affected by the use of power tapping in either screw type.

scholarly journals Are Magnesium Screws Proper for Mandibular Condyle Head Osteosynthesis?

Materials ◽  
2020 ◽  
Vol 13 (11) ◽  
pp. 2641
Author(s):  
Marcin Kozakiewicz
Keyword(s):  
Magnesium Alloys ◽  
Mandibular Condyle ◽  
Bone Screws ◽  
Screw Head ◽  
Titanium Screw ◽  
Suitable Material ◽  
Pull Out ◽  
Biodegradable Magnesium ◽  
Torsional Properties ◽  
Pull Out Strength

Recently, magnesium alloys have gained a significant amount of recognition as potential biomaterials for degradable implants for craniofacial bone screws. Purpose: The aim of this work was to compare screws made specifically for mandibular head osteosynthesis from different materials. Materials and Methods: Screws measuring 14 mm made by one manufacturer specifically for mandibular head osteosynthesis out of the following materials were selected: magnesium (MgYREZr), titanium (Ti6Al7Nb), and polymer (PLGA). The axial pull-out strength and torsional properties were investigated. Results: Each type of screw presented different pull-out forces (Kruskal–Wallis test, p < 0.001). The magnesium screw had the highest pull-out force of 399 N (cracked without the screw out being pulled out), followed by the titanium screw, with a force of 340 N, and the PLGA screw, with a force of 138 N (always cracked at the base of the screw head without the screw being pulled out). ANOVA was performed for the maximal torques before damage to the screw (torsional properties), revealing that the maximal torque of the magnesium screw was 16 N·cm, while that of the titanium screw was 19 N·cm. The magnesium screw was significantly weaker than the titanium screw (p < 0.05). The measured torque and pull-out force were not related to each other (p > 0.05). Conclusion: Among the screws compared, the metal biodegradable magnesium screw seems to be the most suitable material for multiscrew mandibular head osteosynthesis, considering the condition of the fragile screwdriver socket.

scholarly journals The effect of tissue culture on suture holding strength and degradation in canine tendon

2009 ◽  
Vol 34 (5) ◽  
pp. 643-650 ◽  
Author(s):  
H. OMAE ◽  
C. ZHAO ◽  
Y.-L. SUN ◽  
M. E. ZOBITZ ◽  
S. L. MORAN ◽  
...  
Keyword(s):  
Tissue Culture ◽  
Tensile Load ◽  
Flexor Digitorum Profundus ◽  
Tendon Suture ◽  
Pull Out ◽  
Culture Model ◽  
Static Tensile ◽  
Tissue Culture Model ◽  
Flexor Digitorum ◽  
Pull Out Strength

The purpose of this study was to assess tendon metabolism and suture pull-out strength after simple tendon suture in a tissue culture model. One hundred and twelve flexor digitorum profundus tendons from 28 dogs were cultured for 7, 14, or 21 days with or without a static tensile load. In both groups increased levels of matrix metalloproteinase (MMP) mRNA was noted. Suture pull-out strength did not decrease during tissue culture. While the presence of a static load had no effect on the pull-out strength, it did affect MMP mRNA expression. This tissue culture model could be useful in studying the effect of factors on the tendon-suture interface.

scholarly journals PULL-OUT STRENGTH OF STEEL RODS BONDED INTO MENGKULANG (TARRIETIA JAVANICA) GLULAM AT FIVE DIFFERENT ANGLES TO THE GRAIN

2018 ◽  
Vol 30 (1) ◽  
pp. 67-74
Author(s):  
Mohamad WNN ◽  
Suliman NH ◽  
Kamarudin MK ◽  
Mohd-Amin N ◽  
Hassan R
Keyword(s):  
Pull Out ◽  
Pull Out Strength
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