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1 Gardner GD, "Wear comparison of thermoplastic materials used for orthodontic retainers" 124 : 294-7, 2003
2 Lee GW, "Tooth morphology" Jisung 126-46, 1997
3 Nahoum HI, "The vacuum formed dental contour appliance" 9 : 385-90, 1964
4 Kesling HD, "The philosophy of the tooth positioning appliance" 31 : 297-304, 1945
5 Ryokawa H, "The mechanical properties of dental thermoplastic materials in a simulated intraoral environment" 65 : 64-72, 2006
6 Tuncay OC, "The invisalign system. Graften road" Quintessence Publishing Co, Ltd 187-94, 2006
7 Boyd RL, "The Invisalign system in adult orthodontics: Mild crowding and space closure cases" 34 : 203-12, 2000
8 Fernandez Sanchez J, "Osamu active retainer for correction of mild relapse" 32 : 26-8, 1998
9 Chenin DA, "Orthodontic treatment with a series of removable appliances" 134 : 1232-9, 2003
10 Vlaskalic V, "Orthodontic treatment of a mildly crowded malocclusion using the invisalign system" 17 : 41-6, 2001
11 Ponitz RJ, "Invisible retainers" 59 : 266-72, 1971
12 McNamara JA, "Invisible retainers" 19 : 570-8, 1985
13 Yoshii O, "Introducing in new retainer-soft retainer and case reports" 8 : 25-42, 1992
14 Kwon JS, "Force delivery properties of thermoplastic orthodontic materials" 133 : 228-34, 2008
15 Sheridan JJ, "Essix retainers: fabrication and supervision for permanent retention" 27 : 37-45, 1993
16 Rinchuse DJ, "Active tooth movement with Essix-based appliances" 31 : 109-12, 1997
17 Bollen AM, "Activation time and material stiffness of sequential removable orthodontic appliances. Part 1: ability to complete treatment" 124 : 496-501, 2003