Continuous load test for individual abutments
The term "Durchläufer" (translated as "Road-Runner") comes from the nomenclature for mechanical laboratory testing of implants and their prosthetic restoration. In a continuous load test, the implant is subjected to cyclic loading under unfavourable conditions until it fails or "runs through".
A proverb says: "Never trust a test you have not faked yourself".
For most dental medical devices, standardized tests are provided to prove clinical suitability. Medical manufacturers who position themselves as long-term and reliable partners will certainly not follow the proverbial advice to "fudge" results. Important insights into the function of the products can be gained from the tests, which are essential for application and patient safety. However, the results of different manufacturers, even though tests were conducted according to the same standard, cannot always be compared 1:1 on the basis of data sheet values. The test conditions, such as sample preparation and test setup, can vary and thus produce different results. In the spirit of our lived transparency, as in our glass production, we would like to give you an insight into our working methods when testing DD Solid Connect® abutments.
Performance tests are particularly important for individual abutments
Individual abutments offer many treatment advantages and must meet high standards of function and durability. Dental implants and components are exposed to constant chewing forces. During mastication, depending on the position in the dentition, high loads occur which the implant and abutment must be able to withstand. To simulate this stress, cyclic load tests (Dentistry - Implants - Dynamic load test for endosseaous dental implants according to ISO 14801) are performed. During development, these tests provide valuable information on the ideal design and are a prerequisite for the approval and preclinical evaluation of the finished products.
"This is how the laboratory marathon for implant components works: Our validation team runs these tests at six DORA stations of the Larado company and can therefore also run six tests simultaneously. One test runs for about three days, in which 5 million cycles simulate about 20 years of clinical use in the mouth."
Genephe Mäder, Projekt Manager Implant Components
- In the continuous load test, the implant is subjected to cyclic loads. Which force is loaded depends first of all on the implant, its outer diameter and length. The first test specimen is loaded until it breaks, without prior loading.
- The cyclic loading starts for the second test specimen with a force of 40 % of the previously determined initial static limit load.
- In case of failure, the load cycles achieved, the specific force and the type of defect are documented and evaluated. If 5 million cycles are passed, the force is increased in the next test. This process is repeated until the samples fail. The last surviving sample is a run-through.
The "Road-Runner" described in the standard refer in our case to at least three implants with abutment and screw connection from a series of at least 10. They must withstand a limit oscillation cycle of 15hz, 5 million cycles at the same force (Newton N) without breaking or cracking. The standard-compliant, individual abutments are manufactured from our DD Solid Connect® Prefabs on a LabTEC 3.50i (i.mes i.core).
Before and after comparison
We destroy the intact "Road-Runner" after the 5 million cycle marathon with a renewed static force. In this way we gain additional information about possible signs of aging, such as a loosening of screws.
Worst case scenario
The behaviour under extreme conditions is particularly revealing. For this reason, we choose an unfavorable angulation of 30°, which usually exceeds the maximum permitted angulation of the implant manufacturer. At the same time, a low embedding depth is simulated.
According to the indication provided by the implant manufacturer, the system must withstand as a minimum the theoretical chewing force at the permitted tooth position for a simulated period of 20 years. Here small implant connections were tested in combination with DD Solid Connect® abutments and screws.
Part of our safety promise is the ideal compatibility with the original implant. Individual abutments and screws made of DD Solid Connect® are designed for precise function and a long service life. This is also confirmed by the results of cyclic load tests. All implant-abutment systems tolerate a significantly higher, constant force during the 5 million cycles than the average chewing force to be expected at the respective tooth position (indication).
2extra-BDIZ EDI konkret, Journal für die implantologische Praxis, S. 174_03-2007
3PileicikieneG, SurnaA. The human masticatorysystemfroma biomechanicalperspective: A review. Stomatologija, Baltic Dental and MaxillofacialJournal, 6: 81-84, 2004.
After passing the dynamic test (endurance test, 5 million cycles), the three Road-Runners of a series were again subjected to static loads. This determines how much load in Newtons the runners can withstand until failure after aging.
The individual abutments and screws also show very good resistance to high, non-permanent masticatory forces - even after simulated 20 years of aging. With DD Solid Connect® components, the interface function, the screw connection and the material show no wear on the tested Road-Runners.
1FerrarioVF, Sforza C, Serrao G, DellaviaC, Tartaglia GM. Single tooth bite forces in healthy young adults. J Oral Rehabil. 2004 Jan;31(1):18-22.1-84, 2004.
Dynamic continuous load
Replace Select® (Nobel Biocare) implant and DD SolidConnect® NRE abutment
• DD SolidConnect Prefab: NRE 35 (DDNREPF35) Lot.: B3J66
• DD Implant Screw: NRE35 (DDNREIS35) Lot.: B3J66 (Set)
• Implant: Nobel Biocare, ReplaceSelect®TaperedPMC Ø 3,5mm x 10mm Lot.: 12122029/12113075/12108618
• 5.000.000 cycles simulate about 20 years in the mouth
• Min. 10 sample test runs until a break, crack or loosening is detected on a component.
• Force of the three runners: 210N
• Static force Initial: 488N
• Static force after load: 480N
• 2x defect
• 8 of 10 have endured 5 million cycles at 190 -220 N
We developed DD Solid Connect® components with the incentive of making a modern and future-oriented prosthetic implant restoration accessible to a large number of patients. The patient has the primary right to a long-term function of his restoration. Good Road-Runners are necessary for this. Our individual abutment solutions are available for the following implant manufacturers: Nobel Biocare, Straumann, Dentsply, Camlog®, MIS Implants®, Zimmer Dental, Astra Tech, Medentis Medical, DENTSPLY Implants
Names marked with ® are trademarks and/or brand names of the manufacturers.
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