[1] Ngan P,Kess B,Wilson S. Perception of discomfort by patients undergoing orthodontic treatment [J].Am J Orthod Dentofacial Orthop,1989,96 (1):47-53.

[2] Giannopoulou C,Dudic A,Montet X.Periodontal parameters and cervical root resorption during orthodontic tooth movement [J].J Clin Periodontol,2008,35 (6):501-506.

[3] Ballard DJ,Jones AS,Petocz P,et al.Continuous vs intermittent controlled orthodontic forces on root resorption.A microcomputed-tomography study [J].Am J Orthod Dentofacial Orthop,2009,136 (1):1-8.

[4] Ballard DJ,Jones AS,Petocz P,et al.Physical properties of root cementum:part 10.Comparison of the effects of invisible removable thermoplastic appliances with light and heavy orthodontic forces on premolar cementum.A microcomputed-tomography study [J].Am J Orthod Dentofacial Orthop,2008,133 (2):218-227.

[5] Proffit WR.Contemporary Orthodontics[M].3rd ed.St Louis:CV Mosby Cooperation,2000.

[6] Cobb NW,Kula KS,Phillips C,et al.Efficiency of multi-strand steel,superelastic Ni-Ti and ion-implanted Ni-Ti archwires for initial alignment [J].Clin Orthod Res,1998,1 (1):12-19.

[7] Andreasen GF,Brady PR.A use hypothesis for 55 nitinol wire for orthodontics [J].Angle Orthod,1972,42 (2):172-177.

[8] Pandis N,Polychronopoulou A,Eliades T.Alleviation of mandibular anterior crowding with copper-nickel-titanium vs nickel-titanium wires:a double-blind randomized control trial [J].Am J Orthod Dentofacial Orthop,2009,136 (2):152-153.

[9] 邓丽蓉.正畸治疗中应用热激活镍钛弓丝与普通镍钛丝的效果比较[J].现代医院,2014,14 (3):39-40.

[10] Sebastian B.Alignment efficiency of superelastic coaxial nickel-titanium vs superelastic single-stranded nickeltitanium in relieving mandibular anterior crowding:a randomized controlled prospective study [J].Angle Orthodontist,2012,82 (4):703-708.

[11] Mangnall LA,Dietrich T,Scholey JM.A randomized controlled trial to assess the pain associated with the debond of orthodontic fixed appliances [J].J Orthod,2013,40(3):188-196.

[12] Abtahi SM,Mousavi SA,Shafaee H,et al. Effect of low-level laser therapy on dental pain induced by separator force in orthodontic treatment [J].Dent Res J (Isfahan),2013,10(5):647-651.

[13] Tecco S,D'Attilio M,Tetè S,et al.Prevalence and type of pain during conventional and self-ligating orthodontic treatment [J].Eur J Orthodont,2009,31 (4):380-384.

[14] Satpal Singh Sandhu, Sandhu J.A randomized clinical trial investigating pain associated with superelastic nickel-titanium and multistranded stainless steel archwires during the initial leveling and aligning phase of orthodontic treatment [J].Orthod,2013,40(4):276-285.

[15] Storey E,Smith R.Force in orthodontics and its relation to tooth movement [J].Aust J Dent,1952,56 (1):11.

[16] Cioffi I,Piccolo A,Tagliaferri R,et al.Pain perception following first orthodontic archwire placement--thermoelastic vs superelastic alloys:a randomized controlled trial [J].Quintessence Int,2012,43 (1):61-69.

[17] 吉 利,贺 红,钟小龙,等,热激活镍钛弓丝与普通镍钛丝在正畸治疗中的评价 [J].中国组织工程研究与临床康复,2010,14 (16):2929-2931.

[18] Erdinç AM,Dinçer B.Perception of pain during orthodontic treatment with fixed appliances [J].Eur J Orthod,2004,26 (1):79-85.

[19] Kaneko K,Kawai S.On the pain experience of the tooth caused by placement of initial archwire[J].Fukuoka Shika Daigaku Gakkai Zasshi,1990,17 (1):22-27.

[20] Campos MJ,Fraga MR,Raposo NR,et al.Assessment of pain experience in adults and children after bracket bonding and initial archwire insertion [J].Dental Press J Orthod,2013,18 (5):32-37.

[21] Scheurer PA,Firestone AR,Bürgin WB.Perception of pain as a result of orthodontic treat-ment with fixed appliances [J].Eur J Orthod,1996,18 (4):349-357.

[22] 罗 薇,杨 秩,赖文莉.视觉模拟评分法评价多个临床因素对正畸初始疼痛的影响 [J].实用口腔医学杂志,2007,23 (6):867-870.