||Evaluation of force/moment induced by wire-bracket contact in orthodontic treatment
||Institute of Oral Medicine
force and moment
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
Chapter 1 Introduction 1
1-1 Background 1
1-2 Literature review 2
1-2-1 Measurement of three dimension forces and moments 2
1-2-2 Finite element method 4
1-3 Motivation 7
1-4 purpose 8
Chapter 2 Materials and methods 9
2-1 Experimental flowchart 9
2-2 In-vitro study 10
2-3 3-D numerical simulations 13
Chapter 3 Results 19
3-1 In-vitro study 19
3-1-1 V-bend 19
3-2-2 Step bend 27
3-2 3-D numerical simulations 29
3-2-1 V-bend 29
3-2-2 Step-bend 35
Chapter 4 Discussion 37
4-1 Measurement of three dimension forces and moments 37
4-2 Finite element method 40
Chapter 5 Conclusion 44
Appendix 1 Pilot study 50
Appendix 2 : Experience about solving problems of V-bend wire model 1 54
Appendix 3 : The difference force systems between bracket and center of resistance 56
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