Factors that relate to treatment duration for patients with palatally impacted maxillary canines.

The objectives of this study were to determine the relationship between the initial position of a palatally impacted maxillary canine (as seen on a panoramic radiograph) and the duration of orthodontic treatment and to determine whether a difference in treatment duration existed between patients with bilateral palatally impacted canines and patients with unilateral impaction. A total of 47 adolescent subjects were chosen (9 subjects with unilateral impactions and 18 subjects with bilateral impactions). All subjects had full fixed orthodontic appliances placed. The treatment duration of this group was compared with that of a control group with similar characteristics but without the impacted canine. The results showed that the average duration of treatment was 22.4 months for the control group, 25.8 months for the unilateral-impacted group, and 32.3 months for the bilateral-impacted canine group. The length of treatment for the impacted canine sample was related to the age of the patient at the start of treatment; younger patients required a longer treatment. The younger the patient, the more severely impacted the canine. The bilateral-impacted canine group had at least 1 canine that was more severely impacted than the impacted canine in the unilateral-impacted group. If the canine was impacted less than 14 mm from the occlusal plane, treatment duration averaged 23.8 months; if the canine was impacted more than 14 mm from the occlusal plane, treatment duration averaged 31.1 months.

[1]  L Lorton,et al.  The incidence of unerupted permanent teeth and related clinical cases. , 1985, Oral surgery, oral medicine, and oral pathology.

[2]  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.

[3]  Hitchin Ad,et al.  The impacted maxillary canine. , 1951 .

[4]  A. Fournier,et al.  Orthodontic considerations in the treatment of maxillary impacted canines. , 1982, American journal of orthodontics.

[5]  P. Smith,et al.  The incidence of anomalous maxillary lateral incisors in relation to palatally-displaced cuspids. , 2009, The Angle orthodontist.

[6]  F. Howell,et al.  A survey of 3, 874 routine full-month radiographs. II. A study of impacted teeth. , 1961, Oral surgery, oral medicine, and oral pathology.

[7]  D. Burden,et al.  Palatally ectopic canines: closed eruption versus open eruption. , 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.

[8]  H. Jacoby.  The 'ballista spring" system for impacted teeth. , 1979, American journal of orthodontics.

[9]  A. Williams,et al.  The incidence of impacted teeth. A survey at Harlem hospital. , 1970, Oral surgery, oral medicine, and oral pathology.

[10]  P. C. Hermanson,et al.  Influence of severity of malocclusion on the duration of orthodontic treatment. , 1973, American journal of orthodontics.

[11]  S. Cunningham,et al.  The effect of two alternative methods of canine exposure upon subsequent duration of orthodontic treatment. , 1998, International journal of paediatric dentistry.

[12]  J. Årtun,et al.  Pulpal and periodontal reactions to orthodontic alignment of palatally impacted canines. , 1994, The Angle orthodontist.

[13]  R. Smith,et al.  The duration of orthodontic treatment. , 1992, 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]  H Jacoby,et al.  The etiology of maxillary canine impactions. , 1983, American journal of orthodontics.

[15]  S Peck,et al.  The palatally displaced canine as a dental anomaly of genetic origin. , 1994, The Angle orthodontist.

[16]  J. Salzmann.  Malocclusion severity assessment. , 1967, American journal of orthodontics.

[17]  A Richardson,et al.  Normal eruption of the maxillary canine quantified in three dimensions. , 1997, European journal of orthodontics.

[18]  K. Mattila,et al.  Localization of impacted maxillary canines by panoramic tomography. , 1979, Dento maxillo facial radiology.

[19]  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.

[20]  Å. Nordenram,et al.  Positional variations of the impacted upper canine. A clinical and radiologic study. , 1966, Oral surgery, oral medicine, and oral pathology.

[21]  D. Birnie,et al.  Management of palatally impacted canines: the findings of a collaborative study. , 1997, European journal of orthodontics.

[22]  A Becker,et al.  The use of panoramic radiographs to localize displaced maxillary canines. , 1999, Oral surgery, oral medicine, oral pathology, oral radiology, and endodontics.

[23]  K. Knoernschild,et al.  Endotoxin affinity for orthodontic brackets. , 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.

[24]  K Horner,et al.  Localising maxillary canines using dental panoramic tomography , 1995, British Dental Journal.

[25]  C. Kowalski,et al.  The duration of orthodontic treatment with and without extractions: a pilot study of five selected practices. , 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.

[26]  C. Cobb,et al.  An evaluation of factors affecting duration of orthodontic treatment. , 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.

[27]  M. Kuftinec,et al.  The impacted maxillary canine: I. Review of concepts. , 1995, ASDC journal of dentistry for children.

[28]  P. Wisth,et al.  Comparison of two surgical methods in combined surgical-orthodontic correction of impacted maxillary canines. , 1976, Acta odontologica Scandinavica.

[29]  D. Kohavi,et al.  Periodontal status following the alignment of palatally impacted canine teeth. , 1983, American journal of orthodontics.

[30]  D. W. Alger.  Appointment frequency versus treatment time. , 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.

[31]  S. Mead.  Incidence of impacted teeth , 1930 .