Analysis of Intrusion Forces in Stainless Steel and Nickel-titanium Orthodontic Archwires:  An Experimental Study

Authors

  • Varadaraju Magesh Department of Mechanical Engineering, College of Engineering and Technology, SRM Institute of Science and Technology, Kattankulathur 603203, Chengalpattu, Tamil Nadu, India Author
  • Pandurangan Harikrishnan Teeth”N” Jaws Center, Nungambakkam, Chennai Author
  • Rachit Nishad Department of Mechanical Engineering, SRM Institute of Science and Technology, College of Engineering and Technology, Kattankulathur 603203, Tamil Nadu, India Author
  • Atharva Kapre Department of Mechanical Engineering, SRM Institute of Science and Technology, College of Engineering and Technology, Kattankulathur 603203, Tamil Nadu, India Author
  • Raunak Chatterjee Department of Mechanical Engineering, SRM Institute of Science and Technology, College of Engineering and Technology, Kattankulathur 603203, Tamil Nadu, India Author

Keywords:

intrusion, spine tester, maxillary incisors, mandibular incisors, stainless steel, NiTi

Abstract

Orthodontics involves alignment of improperly positioned teeth mostly with fixed appliances. Round archwires are commonly used for intrusion of anterior teeth. The aim of this study was to measure the magnitude of force required to deflect the archwire for 2 mm between central and lateral incisors. To mimic the real oral domain, an experimental set-up with maxilla and mandible with metallic teeth was constructed.  Orthodontic brackets (0.018″ × 0.025″) were bonded on the metal tooth and 0.016″ Stainless steel (SS) and Nickel Titanium (NiTi) archwires were used with SS ligature.  The archwire is deflected for 2 mm and a three point bending test was performed to measure the force magnitude using a six-axis spine tester. The forces from NiTi and SS archwires were 10.3 N and 11.4 N respectively in the maxilla, and 13.2 N and 15.3 N respectively in the mandible. As the deflection increases the loading forces also increase and is higher in SS than NiTi. Clinicians can thus selection their deflection for the amount of force needed for intrusion planning.

Author Biography

  • Pandurangan Harikrishnan, Teeth”N” Jaws Center, Nungambakkam, Chennai

    Craniofacial Orthodontist & Oral Surgeon, Teeth "N” Jaws center, 23 & 25, Lake Area 1st Cross Street, Nungambakkam, Chennai 600034

    Prof. & Head of Orthodontics, JKKN Dental College, Komarapalayam, Tamil Nadu, India 

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Published

2024-04-17

Issue

Vol. 38 No. 1 (2024)

Section

Original Research Article