Evaluation of force/moment induced by wire-bracket contact in orthodontic treatment

Abstract

Many researches about the forces and moments induced by orthodontic treatment were reported There were neither experiment about three-dimension force and moment induced by one bended wire and two brackets system nor numerical simulations to analyze the relation between bended wire and brackets The aim of this study was to develop an in-vitro experiment model to detect 3-D force/moment system induced by different sizes of stainless steel wire with V-bend or step-bend and to mimic by using finite element method An in-vitro experiment model was built up with two 018 slot brackets connected to a 6-axis load cell for data collection The fixture was designed with solidwork and fabricated with acrylonitrile butadiene styrene (ABS) by 3-D printer Varies size of stainless steel wires with V-bend were put into brackets at different position Different heights of step-bend stainless steel wires were also used 3-D models were built up and numerical simulations were made in ANSYS Workbench The results showed that different data of vertical force and moment of mesio-distal tilting were obtained Besides the brackets also got varied amount of linguo-buccal and mesio-distal force depending on different position of bending point Finite element simulation for step up-bending wire revealed the similar upward force and clockwise moment results with experiment model but higher force of other simulations when comparing to experiment model was noted The maximum strain of archwire was found at the contact point between bracket and wire not at bending point The conclusion was that different direction other than vertical force was produced at the position of bending point and 3D finite element simulation could provide more information

Date of Award	2014 Aug 27
Original language	English
Supervisor	Jia-Kuang Liu (Supervisor)