Corp 3
Midterm Concepts Presentation

Jonathan Hill
John Maddox
Allen Lindsay
Crichton Neal
Chris Howell
Felicia Craig
Bradley Johnson

 General Specification
 ISO Standards
 Primary Concept
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• Solid Edge
Advantages/Disadvantages
Water Bath
• Economic Analysis
 Secondary Concept
 Phase II

 General Constraints
 small and light enough to operate on a tabletop
 clean and quiet enough to operate indoors at the
BioHorizons offices
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Able to perform fatigue tests as well as static load tests
Control system and sensors must measure failure load and cycles to failure and discontinue operation at this point
Entire system must be able to be calibrated accurately enough for continuous operation within ISO 14801 specifications and constraints
 Economic Constraints
 to produce a fatigue testing machine that can be reproduced and used for less than it currently costs to have the dental implants tested from an outside company

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ISO provides more specific specifications and constraints in ISO
14801 —Dentistry—Fatigue test for endosseous dental implants
Several of the more pertinent specifiations are covered below, obtained from the ISO document:
 The testing machine should be capable of applying the specified load with an error not exceeding ± 5% at maximum load.
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The endosseous dental implant shall be clamped such that it makes a 30 ° ± 1° angle with the loading direction of the testing machine.
The device shall clamp the specimen at a distance 3.0 mm ±
0.1 mm apically from the nominal bone level as specified in the manufacturer’s instruction for use.

 More constraints and specifications:
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The dimensions of the loading member shall be chosen to define a distance l = 11.0 mm ± 0.1 mm from the centre of the hemisphere to the clamping plane.
For endosseous dental implants that include materials in which corrosion fatigue has been reported or is expected to occur…testing shall be carried out in water of Grade 2 according to ISO 3696, in normal saline [.09%]* or in physiologic medium. The fluid and the test specimen shall be kept at 37 °C ± 2°C during the testing.
Fatigue testing shall be carried out with a unidirectional load.
The load shall vary sinusoidally between a nominal peak value and 10 % of this value . The loading frequency shall be ≤ 15 Hz . Testing in liquid media shall be conducted at frequencies ≤ 2 Hz .
*As specified by BioHorizons

 ISO 1099 : Metallic materials —Fatigue testing—Axial force controlled method
 ISO 1942-1 : Dental vocabulary —Part 1: General and clinical terms
 ISO 3696 : Water for analytical laboratory use —Specification and test methods
 ISO 4965 : Axial load fatigue testing machines —Dynamic force calibration —Strain gauge technique
 ISO 7500-1 : Metallic materials —Verification of static uniaxial testing machines —Part 1: Tension/compression testing machines —Verification and calibration of the forcemeasuring system

Temperature
Sensor
Liquid Bath
Container
(Pyrex)
Frame (steel)
Washer
(Rubber)
Container Base
Thumb Screw
Insert (will be tapped to hold test piece)
Linear
Motor/Load
Cell
Base (steel)
Mounting Screws

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Long life
Excellent precision and reliability
Ease in varying load and frequency
Low maintenance
Easy setup
Small number of parts
Conduct static and fatigue tests without changing setup

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Initial costs are high
Replacement parts would be high
 Possible motor cooling may need to be addressed
 Different inserts need to be tapped for each implant tested

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Heating element
 Small and compact
 Low fluid volume rated
Temperature switch
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Small and compact
+-2 °C tolerance
Dish
 Metal bottom
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Glass sides
Water tight
Water level switch
 Small and compact
 Safely maintain water level

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Metal base
 Base for mounting heating components
 Able to drain the dish through a ball valve
Glass tube
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Forms sides
Able to withstand high temps incase of heating problems
 Able to see the test specimen during testing
Washer
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Or sealant as of yet to be determined
Seals the base to the glass

 ISO 14801:2003
 5.4 Testing Environment
 testing shall be carried out in water of Grade 2 according to ISO 3696
 fluid and the test specimen shall be kept at 37
°C+2°C or -2 °C

 Compact Cartridge-Style Immersion Heater
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1 5/8" long type 316 stainless steel element
Maximum temperature of 100 ° C
 CSA Certified and UL-Registered
 Can be fully immerged in saline solution

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Submersible Cartridge Temperature Switch
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Operates as a thermostat
300 series stainless steel outer shell adjusted between -73 ° and +315° C
2” long element
UL-Registered
Search continues to refine this component

 Vertical-Mount Liquid-Level Switch
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Maintain a safe water level for the
Immersion heating element
Over all length of 1 7/8“
Max temperature rating of 105
°C
 When the fluid level drops too low
 cut power to the heating element
 turn on a warning light or trigger a system warning in the testing program letting the tester know to add more fluid

 Handles static loading up to 500 lbf.
 Handles a cycling load from 0 to 150 lbf. at a rate up to 15 Hz

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 Piezoelectric sensing cell
Highly repeatable
Fatigue Rated load cell
Low profile to fit easily within machine

 Load cell sends a signal through a DAQ card to
LabView
 LabView takes the data and depending on the load it will send a signal to the Driver which will in turn increase or decrease the current

Linear Motor, Cooling Jacket, Controller, and Driver : $19600
Load Cell : $1000
Lab View : $1200 per year
Jig Frame and Base : $2000
Computer : $600
Heating Accessories : $300
Cables and Connectors : $200
Total Costs : $25000

 Cheap saline bath container
 Rotary motor is cheaper than linear motor

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 Bearings
(maintenance)
Expensive to machine
Small error in load cell reading due to the bearing friction
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Angle of applied force will be less reliable
Complicated – many possible places for failure

 Obtain more quotes on linear motors
 Dimension Concept
 Stress Analysis
 Finalize Concept