Lateral incisor root resorption and active orthodontic treatment in the early mixed dentition.

AIM To evaluate the presence of root resorption in the lateral incisor after active orthodontic treatment in the early mixed dentition. METHODS Twenty-six children treated at the Children's Clinic of the Schulich School of Medicine and Dentistry at the University of Western Ontario were examined radiographically for lateral incisors root resorption before and after early active treatment to align upper incisors (2 x 4 appliance). In addition, canine inclinations to the midline and to the long axis of the lateral incisor as well as the most medial position of the canine crown were measured as potential risk factors for root resorption. RESULTS 8% (4) of the lateral incisors exhibited root resorption and the mean crown-to-root ratio of these teeth was significantly higher than that for lateral incisors not exhibiting root resorption. Similarly, mean canine inclinations to the midline and to the long axis of the lateral incisor were also significantly higher for the root resorption group. No association could be found between the most medial position of the canine crown and root resorption in the lateral incisor. CONCLUSION This study showed that active orthodontic treatment in the early mixed dentition does not increase the risk for root resorption in the lateral incisors as long as the clinician takes into consideration canine inclinations and their potential effect on root resorption. Limitations inherent to radiographic assessment are acknowledged.

[1]  S. Brooks,et al.  Dosimetry of 3 CBCT devices for oral and maxillofacial radiology: CB Mercuray, NewTom 3G and i-CAT. , 2006, Dento maxillo facial radiology.

[2]  S. Brooks,et al.  Dosimetry of two extraoral direct digital imaging devices: NewTom cone beam CT and Orthophos Plus DS panoramic unit. , 2003, Dento maxillo facial radiology.

[3]  S. Ericson,et al.  Does the canine dental follicle cause resorption of permanent incisor roots? A computed tomographic study of erupting maxillary canines. , 2002, The Angle orthodontist.

[4]  T. Hosoi,et al.  Comparison of patient dose from imaging protocols for dental implant planning using conventional radiography and computed tomography. , 2001, Dento maxillo facial radiology.

[5]  J Kurol,et al.  Incisor root resorptions due to ectopic maxillary canines imaged by computerized tomography: a comparative study in extracted teeth. , 2009, The Angle orthodontist.

[6]  S. Ericson,et al.  Resorption of incisors after ectopic eruption of maxillary canines: a CT study. , 2009, The Angle orthodontist.

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

[8]  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.

[9]  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.

[10]  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.

[11]  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.

[12]  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.

[13]  J Kurol,et al.  Resorption of maxillary lateral incisors caused by ectopic eruption of the canines. A clinical and radiographic analysis of predisposing factors. , 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.

[14]  J Kurol,et al.  Incisor resorption caused by maxillary cuspids. A radiographic study. , 1987, The Angle orthodontist.

[15]  J Kurol,et al.  Radiographic examination of ectopically erupting maxillary canines. , 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.

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

[17]  M. Lundberg,et al.  Root resorption after orthodontic treatment of traumatized teeth. , 1982, American journal of orthodontics.

[18]  B. Zachrisson.  Cause and prevention of injuries to teeth and supporting structures during orthodontic treatment. , 1976, American journal of orthodontics.

[19]  O. Karadzova,et al.  [Root resorption]. , 1968, Stomatoloski glasnik Srbije.