Jarabak JR, Fizzell JA. Techniques and treatment with the light wire appliances: light differential force in clinical orthodontics. Mosby, St Louis 1963:192–3,353–79.
Verdonshot EH, Sanders AJ, Plasschaert AJ. Computeraided image analysis system for area measurement of tooth root surfaces. J Periodontol 1990; 61:275–80.
Mowry JK, Ching MG, Orjansen MD, Cobb CM, Friesen LR, MacNeill SR et al. Root surface area of the mandibular cuspid and bicuspids. J Periodontol 2002;68:1095–100.
Bjorndal AM, Henderson WG, Skidmore AE, Kellner FH. Anatomic measurements of human teeth extracted from males between the ages of 17 and 21 years. Oral Surg 1974; 38:791–803.
Kay S, Forscher BK, Sackettt LM, Tooth root length-volume relationships, an aid to periodontal prognosis. 1. Anterior teeth. Oral Surg Oral Med Oral Pathol 1954:7:735–40.
Chen SK, Pan JH, C CM, Jeng JY. Accuracy of supported root ratio estimation from projected length and area using digital radiographs. J Periodontol 2004;75:866–71.
Ren Y, Maltha J, Van’t Hof MA, Kuijpers-Jagtman AM. Optimum force magnitude for orthodontic tooth movement: a systematic literature review. Am J Orthod Dentofacial Orthop 2004;125:71–7.