periodontal measurement test system p13061 project review
TRANSCRIPT
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Periodontal Measurement Test System
P13061 Project Review
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Team P13061
Ray Boronczyk (ME), Evan Lammertse (ME), Sam Remp (EE), Yokai Ro (EE), Ryan Shaw (ME), Kristi Weaver (ME)
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Problem Statement
Periodontal disease affects over 50% of adults worldwide and is the leading cause of tooth loss.
The current method for performing the sulcus depth measurement is a painful, inconsistent and lengthy process.
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Current Method
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Long Term Goal
Develop a new method that is more consistent, less painful and less time consuming.
Ultrasonic transducer
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1st Generation
Develop a test fixture to validate the use of an ultrasonic transducer to perform the sulcus depth measurement.
• Tooth phantom• Test Fixture• Automated program
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Original Customer Needs
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Phantom Material Research
• Relevant properties: acoustic impedance, density, speed of sound
• Initial material selection: – Bone: brick– Dentin: concrete– Soft tissue: paraffin, polyurethane
• Revised material selection: – Bone: aluminum– Soft tissue: rubber, fabric paint
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Phantom Design
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Mechanical- System Needs
• Hold tooth phantom and transducer• Move through 5 axes • Accuracy to +/- 0.1mm and +/- 1 deg• Portable
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Mechanical
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3 Linear Axes
• Lead Screws• Anti-Backlash Nuts• Ball Bearings• Couplings
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Rotational Axes• Servo’s• Linear Bearings
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Challenges Faced
• Misalignment– Machining quality– Positive location
• Time• Miscommunication during manufacturing• Probe Holder– Spring mechanism
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Electrical
System Description
• Arduino UNO development board directly controlling 2 servo motors and indirectly controlling 3 stepper motors through EasyDriver MicroStep controllers.
• Arduino analog to voltage converter interprets linear position of the stepper motors.
• Programmatically captures data from the Oscilloscope then compares and logs it.
Programming Flowchart
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Adapted Customer Needs
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Phantom Test Results
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Mechanical Test Results
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Lateral
Requested Measured Difference
in mm in mm mm
0.5 12.70 0.497 12.62 0.08
0.5 12.70 0.497 12.62 0.08
0.5 12.70 0.497 12.62 0.08
0.75 19.05 0.748 19.00 0.05
0.75 19.05 0.749 19.02 0.03
0.75 19.05 0.749 19.02 0.03
Linear Axes
Vertical
Requested Measured Difference
in mm in mm mm
0.5 12.70 0.497 12.62 0.08
0.5 12.70 0.496 12.60 0.10
0.5 12.70 0.497 12.62 0.08
0.75 19.05 0.753 19.13 -0.08
0.75 19.05 0.754 19.15 -0.10
0.75 19.05 0.753 19.13 -0.08
Longitudinal
Requested Measured Difference
in mm in mm mm
0.5 12.70 0.496 12.60 0.10
0.5 12.70 0.497 12.62 0.08
0.5 12.70 0.497 12.62 0.08
0.75 19.05 0.752 19.10 -0.05
0.75 19.05 0.753 19.13 -0.08
0.75 19.05 0.753 19.13 -0.08
• All within spec
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Rotational AxesTurn Table
Requested MeasuredDeg Deg
1 22 43 64 85 10
6 12
7 148 16
9 18
10 200 to 5 10
5 to 10 2010 to 0 0
0 to 10 21
Pitch AxisRequested Measured
Deg Deg1 02 33 54 75 9
6 11
7 138 15
9 17
10 190 to 5 7
5 to 10 910 to 0 0
0 to 10 17
• Turn Table• Factor of two
• Pitch Axis Possible Problems• Motor size/capability• Motor mount• Coupling
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Electrical Test Results
-5
-4
-3
-2
-1
0
1
2
3
4
5
0 500 1000 1500 2000 2500
Ampl
itude
(VD
C)Bone Response and Dentin Response
Bone Dentin
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Future Work
• Ultrasonic transducer: – Higher frequency– Different type?
• Phantom materials: baseline research• Representative sulcus
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Future Work Cont’d
• Servo motors: mounting change (reduce angular torque)
• Stepper motors: – Positional feedback system– Larger power supply
• Wire harnesses
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Acknowledgements
• Dr. Brown – RIT• Dr. Caton – U of R• Neal Eckhaus – faculty guide• Dr. Helguera – RIT• Professor Landschoot – RIT• Dr. Stephen McAleavy – U of R• Dr. Phillipps – RIT • Dr. Rosenblum – customer• RIT Machine Shop