Predicting and preventing root resorption: Part II. Treatment factors.

The main objective of this study was to determine which treatment factors are most clearly identified with external apical root resorption that is detectable on periapical radiographs at the end of orthodontic treatment. The records of 868 patients who completed fixed, edgewise treatment from experienced clinicians in private practice were examined. The horizontal and vertical displacement of the root apex of the maxillary central incisor was measured on cephalometric radiographs. Patients who underwent first premolar extraction therapy had more resorption than those patients who had no extractions or had only maxillary first premolars removed. Duration of treatment and the horizontal (but not vertical) displacement of the incisor apices were significantly associated with root resorption. No differences were found for slot size, archwire type, use of elastics, and types of expansion. However, there was considerable variation among the 6 offices that were surveyed; 1 office averaged nearly a full millimeter more of resorption per anterior tooth than the office with the least amount of root resorption. We conclude that the clinician should exercise caution with those patients in whom extraction therapy is planned for overjet correction that requires above average treatment time. Finally, each clinician should be aware that the root resorption seen in one practice may be different from the root resorption found in another practice.

[1]  N. Brezniak,et al.  Root resorption after orthodontic treatment: Part 1. Literature review. , 1993, American journal of orthodontics and dentofacial orthopedics : official publication of the American Association of Orthodontists, its constituent societies, and the American Board of Orthodontics.

[2]  D. Lundgren,et al.  Continuous versus interrupted continuous orthodontic force related to early tooth movement and root resorption. , 1995, The Angle orthodontist.

[3]  E. F. Harris,et al.  Directions of orthodontic tooth movements associated with external apical root resorption of the maxillary central incisor. , 1998, American journal of orthodontics and dentofacial orthopedics : official publication of the American Association of Orthodontists, its constituent societies, and the American Board of Orthodontics.

[4]  D M Killiany,et al.  Root resorption caused by orthodontic treatment: an evidence-based review of literature. , 1999, Seminars in orthodontics.

[5]  S. Copeland,et al.  Root resorption in maxillary central incisors following active orthodontic treatment. , 1986, American journal of orthodontics.

[6]  R. Boyd,et al.  Etiology and sequelae of root resorption. , 1998, Seminars in orthodontics.

[7]  N. Brezniak,et al.  Root resorption after orthodontic treatment: Part 2. Literature review. , 1993, American journal of orthodontics and dentofacial orthopedics : official publication of the American Association of Orthodontists, its constituent societies, and the American Board of Orthodontics.

[8]  L. Dermaut,et al.  Apical root resorption of upper incisors caused by intrusive tooth movement: a radiographic study. , 1986, American journal of orthodontics and dentofacial orthopedics : official publication of the American Association of Orthodontists, its constituent societies, and the American Board of Orthodontics.

[9]  M. Pharoah,et al.  A radiographic comparison of apical root resorption after orthodontic treatment with the edgewise and Speed appliances. , 1995, American journal of orthodontics and dentofacial orthopedics : official publication of the American Association of Orthodontists, its constituent societies, and the American Board of Orthodontics.

[10]  C. Engstrom,et al.  A study of the relationship between incisor intrusion and root shortening. , 1988, American journal of orthodontics and dentofacial orthopedics : official publication of the American Association of Orthodontists, its constituent societies, and the American Board of Orthodontics.

[11]  A. Kuijpers-Jagtman,et al.  A radiographic study of posterior apical root resorption in orthodontic patients. , 1994, American journal of orthodontics and dentofacial orthopedics : official publication of the American Association of Orthodontists, its constituent societies, and the American Board of Orthodontics.

[12]  E. F. Harris,et al.  Loss of root length and crestal bone height before and during treatment in adolescent and adult orthodontic patients. , 1990, American journal of orthodontics and dentofacial orthopedics : official publication of the American Association of Orthodontists, its constituent societies, and the American Board of Orthodontics.

[13]  O. Malmgren,et al.  Long-term follow-up of maxillary incisors with severe apical root resorption. , 2000, European journal of orthodontics.

[14]  O Malmgren,et al.  Evaluation of the risk of root resorption during orthodontic treatment: a study of upper incisors. , 1988, European journal of orthodontics.

[15]  V. Brattström,et al.  Nailbiting: Frequency and Association with Root Resorption during Orthodontic Treatment , 1985, British journal of orthodontics.

[16]  P K Turley,et al.  Analysis of stress in the periodontium of the maxillary first molar with a three-dimensional finite element model. , 1999, American journal of orthodontics and dentofacial orthopedics : official publication of the American Association of Orthodontists, its constituent societies, and the American Board of Orthodontics.

[17]  C. Phillips,et al.  Factors related to root resorption in edgewise practice. , 2009, The Angle orthodontist.

[18]  J Middleton,et al.  Stresses induced by edgewise appliances in the periodontal ligament--a finite element study. , 1992, The Angle orthodontist.

[19]  C. O. Henrikson,et al.  Root resorption during Begg treatment; a longitudinal roentgenologic study. , 1975, American journal of orthodontics.

[20]  J Artun,et al.  Risk factors for apical root resorption of maxillary anterior teeth in adult orthodontic patients. , 1995, American journal of orthodontics and dentofacial orthopedics : official publication of the American Association of Orthodontists, its constituent societies, and the American Board of Orthodontics.

[21]  E. Korn,et al.  Apical root resorption in orthodontically treated adults. , 1996, American journal of orthodontics and dentofacial orthopedics : official publication of the American Association of Orthodontists, its constituent societies, and the American Board of Orthodontics.

[22]  J. Subtelny,et al.  Orthodontic relapse, apical root resorption, and crestal alveolar bone levels. , 1987, American journal of orthodontics and dentofacial orthopedics : official publication of the American Association of Orthodontists, its constituent societies, and the American Board of Orthodontics.

[23]  L. Linge,et al.  Patient characteristics and treatment variables associated with apical root resorption during orthodontic treatment. , 1991, American journal of orthodontics and dentofacial orthopedics : official publication of the American Association of Orthodontists, its constituent societies, and the American Board of Orthodontics.

[24]  S. A. Alexander.  Levels of root resorption associated with continuous arch and sectional arch mechanics. , 1996, American journal of orthodontics and dentofacial orthopedics : official publication of the American Association of Orthodontists, its constituent societies, and the American Board of Orthodontics.

[25]  W. S. Parker.  Root resorption--long-term outcome. , 1997, American journal of orthodontics and dentofacial orthopedics : official publication of the American Association of Orthodontists, its constituent societies, and the American Board of Orthodontics.

[26]  L. Linge,et al.  Apical root resorption in upper anterior teeth. , 1983, European journal of orthodontics.

[27]  A. Björk,et al.  Growth of the Maxilla in Three Dimensions as Revealed Radiographically by the Implant Method , 1977, British journal of orthodontics.

[28]  D. M. Killiany,et al.  Facial and dentoalveolar structure and the prediction of apical root shortening. , 1996, American journal of orthodontics and dentofacial orthopedics : official publication of the American Association of Orthodontists, its constituent societies, and the American Board of Orthodontics.

[29]  E. F. Harris,et al.  Apical root resorption in orthodontically treated subjects: analysis of edgewise and light wire mechanics. , 1994, American journal of orthodontics and dentofacial orthopedics : official publication of the American Association of Orthodontists, its constituent societies, and the American Board of Orthodontics.

[30]  J. Årtun,et al.  Long-term evaluation of root resorption occurring during orthodontic treatment. , 1989, American journal of orthodontics and dentofacial orthopedics : official publication of the American Association of Orthodontists, its constituent societies, and the American Board of Orthodontics.

[31]  J Middleton,et al.  A stress analysis of the periodontal ligament under various orthodontic loadings. , 1991, European journal of orthodontics.

[32]  B. Goldin.  Labial root torque: effect on the maxilla and incisor root apex. , 1989, American journal of orthodontics and dentofacial orthopedics : official publication of the American Association of Orthodontists, its constituent societies, and the American Board of Orthodontics.

[33]  J. Årtun,et al.  Prevalence and severity of apical root resorption of maxillary anterior teeth in adult orthodontic patients. , 1995, European journal of orthodontics.

[34]  D. Lundgren,et al.  The effects of a four-fold increased orthodontic force magnitude on tooth movement and root resorptions. An intra-individual study in adolescents. , 1996, European journal of orthodontics.

[35]  D. Lundgren,et al.  Time-related root resorption after application of a controlled continuous orthodontic force. , 1996, American journal of orthodontics and dentofacial orthopedics : official publication of the American Association of Orthodontists, its constituent societies, and the American Board of Orthodontics.