Comparison of Stress Distribution and Displacement of Skeletal, Dental, and Dentoalveolar Units in Slow Maxillary Expansion Using Quad Helix and Nickel Titanium Palatal Expander-2: A Finite Element Study

Warsha Yadav; Satpreet Singh Bhasin

doi:10.5005/djas-11014-0021

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Comparison of Stress Distribution and Displacement of Skeletal, Dental, and Dentoalveolar Units in Slow Maxillary Expansion Using Quad Helix and Nickel Titanium Palatal Expander-2: A Finite Element Study

Warsha Yadav, Satpreet Singh Bhasin

Keywords : Corrective orthodontics, Displacement, Finite element method, Malocclusion, NiTi Palatal Expander-2Displacement, Orthodontics, Quadhelix, Slow maxillary expansion, Stress distribution

Citation Information : Yadav W, Bhasin SS. Comparison of Stress Distribution and Displacement of Skeletal, Dental, and Dentoalveolar Units in Slow Maxillary Expansion Using Quad Helix and Nickel Titanium Palatal Expander-2: A Finite Element Study. 2023; 11 (2):71-79.

DOI: 10.5005/djas-11014-0021

License: CC BY-NC-ND 4.0

Published Online: 31-08-2023

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Abstract

Introduction: Slow maxillary expansion is a common procedure for space gain in orthodontics. It has been used to correct maxillary transverse deficiencies. Several appliances, such as NiTi Palatal Expander-2 (NPE-2) and Quad Helix have emerged as some of the efficacious expanders. This finite element study was aimed at evaluating the stress distribution and displacement of skeletal, dentoalveolar, and dental units using Quad Helix and NPE-2 on a dry human skull. Aims and objectives: The aim of the study was to compare three-dimensional stress distribution and displacement of skeletal, dentoalveolar, and dental units using Quad Helix and NPE-2. Materials and methods: CT scan images of maxilla, Quad Helix appliance and NPE-2 were generated and converted to geometric model and then into finite element model for analysis. The expansion force was kept constant at 350 g for NPE-2 and 398 g for the Quad Helix model. Results: Maximum stress was seen from canine-to-molar region in cortical bone and between central incisors in cancellous bone with both the appliances but the magnitude of stress generated was more with Quad Helix. Stress generated in PDL was more with Quad Helix as compared with NiTi expander-2. Expansion achieved with Quad Helix was greater as compared with NiTi expander-2.

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