Arthroplasty

A wide variety of mechanical tests can be performed on endoprostheses with DYNA-MESS servo-pneumatic testing machines. For those tests, the TP 5kN HF and the TP 10kN HF machines are used.

Hips

ISO 7206-4
"Implants for surgery - Partial and total hip joint prostheses - Part 4: Determination of endurance properties and performance of stemmed femoral components"

ISO 7206-6
"Implants for surgery - Partial and total hip joint prostheses - Part 6: Determination of endurance properties of head and neck region of stemmed femoral components"

ISO 7206-8
"Implant for surgery - Partial and total hip joint prostheses - Part 8: Endurance performance of stemmed femoral components with application of torsion"

The fatigue tests on the hip shaft as well as combined traction/torsion tests are performed with ball sockets.

The DYNA-MESS software complies with the load value and ensures an adequate temporal relationship between the different loads.

Standard shear tests

For standardized tests where the load needs to be applied in angle with the clamped implant, both clamping tools and special adapters are available. In addition, a lot of fixtures and accessories are available which allow to perform a large range of tests (traction, bending, etc.).

Test frequency : 15 Hz
Number of cycles : 5 M
Testing machine : DYNA-MESS TP 10 kN HF

Knee

ISO 14879-1

"Implants for surgery - Total knee-joint prostheses - Part 1: Determination of endurance properties of knee tibial trays"

Test frequency: 5 Hz
Number of cycles: 10 M
Testing machine : DYNA-MESS TP 10 kN

Spinal column

ASTM F 1717-96
"Standard test methods for spinal implant constructs in a vertebrectomy model".

ASTM F 1798-97
"Standard guide for evaluating the static and fatigue properties of interconnection mechanisms and sub-assemblies used in spinal arthrodesis implants"

ASTM F 2077-01
"Test methods for inter-vertebral body fusion devices"

Test frequency : 2 - 3 Hz
Number of cycles: 10 M
Testing machine : DYNA-MESS TP 5 kN

Bone cement

For dynamic testing of bone cement, standard test specimens are used and subjected to a bending test.

The other types of cement implants (hip joints for example) are subjected to a dynamic load to evaluate the bonding between the implant and the bone.

Dental

For fatigue test on dental implants (according to DIN EN ISO 14801), DYNA-MESS testing machine model TP 5kN HF is used.

Test frequency : 15 Hz
Number of cycle : 5 M
Testing machine : DYNA-MESS TP 5 kN HF

For more information: Dental implants

Continuous data recording

By continuously recording data throughout the test period, it is possible to have a statement not only about the type of damages or change in the test parameters but also the evolution of the damages or parameters while performing a test. All data are automatically recorded for further documentation.

DYNA-EndoWear 3HK

Universal Implant Wear Simulation type 3K

DYNA-MESS has developed the DYNA-EndoWear- series in close cooperation with universities, renowned users and clinics. Only one machine is required to test hip and knee joint types according to DIN EN ISO 14242-1 (hip) and 14243-3 & 14243-1 (knee).

The machine is electrically powered and does not require compressed air or hydraulic oil. Thanks to our compact design, DYNA-EndoWear requires comparatively little space in the laboratory.

In addition to the three test stations DYNA-EndoWear always contains a reference station for loaded conditioning without wear influence.

All axes are controlled in closed-loop synchronously by our new high-performance multi-channel controller DYNA-CLC. Together with our established Software DYNA-TCC tests according to the norms mentioned above can easily be parametrised and executed.

A six axis load cell measures force and torque at each test station. Dynamic loads up to F_x=300 N, F_Z=3000 N und M_Z=10 Nm are possible.

DYNA-EndoWear is currently available in three different configurations:

• DYNA-EndoWear 3H for Hip only
• DYNA-EndoWear 3K for Knee only
• DYNA-EndoWear 3HK for Hip and Knee

For tests in medium (e.g. saline), each test station is equipped with a leak detection and can be temperature controlled.

  Datasheet DYNA-EndoWear

DYNAdent

Testing machine for fatigue tests on endosseous dental implants

DYNA-MESS Prüfsysteme offers a machine perfectly adapted for testing dental implants according to ISO 14801.

Compared to the universal testing machines that are commonly used and only slightly modified, the DYNAdent 14801 testing machine offers many advantages for the specific needs of dental materials:

• Perfectly adapted for the ISO 14801 fatigue test
• Electrically driven. No hydraulic, pneumatic or compressed air is required
• Force measurement unit integrated in the head of the machine for optimal protection and precise measurement
• Displacement sensor also intergrated in the head of the machine for optimal protection and precise measurement
• Compact design
• Convenient visual indication of the operation status (setup, testing, end of test)
• Reservoir for test in liquid solution with fluid circulation and temperature regulation
• Free of lateral force due to a special sliding joint
• Comprehensive software including user administration right management, sample tests library, easy testing parameters setting, online graphic, continous data recording during the entire testing period, test report, ...
• Fixture adapted for straight and / or angled implants

By simply changing the standard fixture for the implant, it is possible to perform other tests like:

• 3 or 4 point bending tests on ceramic rods
• Bending test on bridge structures
• Traction tests
• Compression tests
• ...

Available in two versions

DYNA1dent: Single station machine

DYNA5dent: 5-station-machine

DYNAdent comes together with an all-in-one - PC which can be operated by keyboard as well as by touchscreen.

For heating and pumping of physiological saline liquid an additional device can be installed.

Continuous data recording

By continuously recording data throughout the test period, it is possible to have a statement not only about the type of damages or change in the test parameters but also the evolution of the damages or parameters while performing a test. All data are automatically recorded for further documentation and analysis.

 Datasheet DYNAdent 

DYNA-MBS

Medical Bone Screw

DYNA-MESS has developed a special servo-electric testing machine for testing metallic bone screws according to ASTM F543. 

With a nominal force of 1 kN and a displacement of 300 mm, various test modules can be realised:

Static torsion test

• Torque/Angle controlled test with predefined speed
• Adjustable fracture detection
• Determination of yield strength, max. torque, fracture angle
  
  Determination of screw torque

• Angle controlled turn in/out of bone screws with predefined speed under axial load
• Determination of the max. driving torque
  
  
  
  Pull-out test

• Angle controlled screwing in with predefined speed
• Displacement controlled pull-out with predefined speed
• Adjustable fracture detection
  
  Determination of self-tapping properties of self-tapping medical bone screws

• Angle controlled screwing in under increasing axial load
• Determination of the axial force at which the self-tapping effect begins

Further information can be found in the data sheet.

  Data sheet DYNA-MBS