World Journal of Dentistry

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VOLUME 9 , ISSUE 1 ( January-February, 2018 ) > List of Articles

ORIGINAL RESEARCH

Methodology for Stress Measurement by Transparent Dental Aligners using Strain Gauge

Mamta Juneja, Prashant Jindal, Divya Bajaj, Ishan Madhav, Rakesh Tuli

Citation Information : Juneja M, Jindal P, Bajaj D, Madhav I, Tuli R. Methodology for Stress Measurement by Transparent Dental Aligners using Strain Gauge. World J Dent 2018; 9 (1):13-18.

DOI: 10.5005/jp-journals-10015-1499

License: CC BY 3.0

Published Online: 00-02-2018

Copyright Statement:  Copyright © 2018; Jaypee Brothers Medical Publishers (P) Ltd.


Abstract

Aim

Orthodontic tooth movement is a pressing issue nowadays. An increased esthetic demand during orthodontic treatment has resulted in several alternative treatments. However, the need to avoid conventional fixed orthodontic prosthesis has led to the usage of computer-aided scanning, imaging, and printing technology along with the emergence of transparent dental aligners. The motive of this study is to present methodology of measurement of the stress applied by transparent dental aligners on human teeth using a strain gauge-based measurement device.

Materials and methods

Three dimensional (3D) scanner, 3D printer, thermoforming machine, strain gauge, data acquisition device, 3Shape Ortho Analyzer software were used.

Results

For a full-bridge Wheatstone bridge data acquisition system (DAQ), a standard aligner can strain a constantan-based strain gauge by nearly 2.5 × 10—4. This is based on the strain gauge factor of 2, input voltage 5 V for which a change in voltage of 2.5 mV was detected. Young's modulus for constantan strain gauge is given as 17.5 MPa; hence, this produced a stress of nearly 4.38 × 10—3 MPa.

Conclusion

This article describes an effective and convenient methodology for orthodontic treatment design for patients with crowding problem using computer-aided design (CAD) and computer-aided manufacturing (CAM) software and, thereafter, printing different stages of maxilla and mandible using fused deposition modeling (FDM) rapid prototyping technique. A transparent aligner is fabricated using thermoforming process, and the applied stresses on manipulated teeth by aligner can be evaluated using a strain gauge-based DAQ.

Clinical significance

This approach is expected to understand the efficacy of the thermoformed aligners for teeth movements by calculating applied forces and stresses.

How to cite this article

Bajaj D, Madhav I, Juneja M, Tuli R, Jindal P. Methodology for Stress Measurement by Transparent Dental Aligners using Strain Gauge. World J Dent 2018;9(1):13-18.


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  1. Orthodontic measurements on digital study models compared with plaster models: a systematic review. Orthod Craniofac Res 2011 Feb;14(1):1-16.
  2. Stereo lithography interface specification. Rock Hill (SC): 3D Systems, Inc.; 1988.
  3. Stereo lithography interface specification. Rock Hill (SC): 3D Systems, Inc.; 1989.
  4. Dental models made with an intraoral scanner: a validation study. Am J Orthod Dentofacial Orthop 2012 Sep;142(3):308-313.
  5. Accuracy of complete-arch dental impressions: a new method of measuring trueness and precision. J Prosthet Dent 2013 Feb;109(2):121-128.
  6. Validity, reliability, and reproducibility of linear measurements on digital models obtained from intraoral and cone-beam computed tomography scans of alginate impressions. Am J Orthod Dentofacial Orthop 2013 Jan;143(1):140-147.
  7. Accuracy and reproducibility of dental replica models reconstructed by different rapid prototyping techniques. Am J Orthod Dent Orthop 2014 Jan;145(1):108-115.
  8. A novel approach for planning orthognathic surgery: the integration of dental casts into three-dimensional printed mandibular models. Int J Oral Maxillofac Surg 2014 Apr;43(4):454-459.
  9. Comparison of reconstructed rapid prototyping models produced by 3-dimensional printing and conventional stone models with different degrees of crowding. Am J Orthod Dentofacial Orthop 2017 Jan;151(1):209-218.
  10. Fused deposition modeling of novel scaffold architectures for tissue engineering applications. Biomaterials 2002 Feb;23(4):1169-1185.
  11. Accuracy of three-dimensional printing for manufacturing replica teeth. Korean J Orthod 2015 Sep;45(5):217-225.
  12. Analysis of the accuracy of reconstructed two teeth models manufactured using the 3DP and FDM technologies. Strojniški Vestnik J Mech Eng 2016;62(1):11-20.
  13. Dimensional error of selective laser sintering, three-dimensional printing and PolyJet™ models in the reproduction of mandibular anatomy. J Cranio Maxillofac Surg 2009 Apr;37(3):167-173.
  14. Dimensional error in selective laser sintering and 3D-printing of models for craniomaxillary anatomy reconstruction. J Cranio Maxillofac Surg 2008 Dec;36(8):443-449.
  15. Validation of cone beam computed tomography—based tooth printing using different three-dimensional printing technologies. Oral Surg Oral Med Oral Pathol Oral Radiol 2016 Mar;121(3):307-315.
  16. Mechanical properties of FDM and SLA low-cost 3-D prints. Procedia Eng 2016 Dec;136:257-262.
  17. Thermoformed Plastic Dental Retainer and Method of Construction. U.S. Patent No. 5692894. New Orleans (LA): Raintree Essix, Inc.; 1997.
  18. Thermoforming. Hoboken (NJ): John Wiley & Sons, Inc.; 2003.
  19. Mechanical properties of components fabricated with open-source 3-D printers under realistic environmental conditions. Mater Des 2014 Feb;58:242-226.
  20. Effect of thermocycling on the shear bond strength of a cyanoacrylate orthodontic adhesive. Am J Orthod Dentofacial Orthop 2003 Jan;123(1):21-24.
  21. Invisible orthodontics part 1: Invisalign. Dent Update 2013 Apr;40(3):203-204, 207-210, 213-215.
  22. Intentions and behaviors to obtain invisalign. J Med Mark 2010 Apr;10(2):135-145.
  23. Effects of mechanical stress and growth on the velocity of tooth movement. Am Assoc Orthod 2014 Apr;145(4 Suppl):S74-S81.
  24. Orthodontic tooth movement with clear aligners. ISRN Dent 2012 Jul;2012:657973.
  25. An ultra-thin piezoresistive stress sensor for measurement of tooth orthodontic force in invisible aligners. IEEE Sensors Journal. 2012 May;12(5):1090-1097.
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