Unilateral and bilateral dental transpositions in the maxilla-dental and skeletal findings in 63 individuals.
OBJECTIVE
This was to elucidate dental and skeletal findings in individuals with unilateral and bilateral maxillary dental transpositions.


METHODS
The sample comprised of radiographic materials from 63 individuals with maxillary dental transpositions from the Departments of Odontology at the Universities of Copenhagen and Aarhus and by the Danish municipal orthodontic service. The cases were divided into three groups: unilateral transposition of the canine and first premolar (Type 1U), bilateral transposition of canine and first premolar (Type 1B), and unilateral transposition of canine and lateral incisor (Type 2). The dentitions were analysed regarding agenesis and dental morphological anomalies on panoramic radiographs, and craniofacial aspects were cephalometrically analysed on profile images The results were statistically evaluated.


RESULTS
All groups demonstrated increased occurrences of agenesis (Type 1U and Type 1B: 31 agenesis in 15 patients; and Type 2 three agenesis in three patients). Taurodontic root morphology was most dominant in Type 1U. Peg-shaped lateral incisors showed an increased occurrence, though not in Type 1U. Skeletally, Type 1B and Type 1U demonstrated maxillary retrognathia (more pronounced in Type 1B). Type 2 showed a significant posterior inclination of the maxilla.


CONCLUSIONS
Transpositions of maxillary canines involve dental and skeletal deviations. Dental deviations were predominantly taurodontic root morphology and agenesis. Regarding skeletal deviations, bilateral transpositions of the canines and the first premolars are associated with skeletal changes. Unilateral transpositions are possibly a localised deviation with minor or no skeletal involvements. The results indicate a possible difference in the aetiologies of unilateral and bilateral transpositions.
Orthodontic Section, Department of Odontology, Faculty of Health and Medical Sciences, University of Copenhagen, 20 Nørre Allé, 2200, Copenhagen, Denmark.
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JC
Danielsen
Orthodontic Section, Department of Odontology, Faculty of Health and Medical Sciences, University of Copenhagen, 20 Nørre Allé, 2200, Copenhagen, Denmark.
K
K
Karimian
Section of Orthodontics, Department of Odontology, School of Dentistry, Aarhus University, Aarhus, Denmark.
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R
Ciarlantini
Section of Orthodontics, Department of Odontology, School of Dentistry, Aarhus University, Aarhus, Denmark.
B
B
Melsen
Orthodontic Section, Department of Odontology, Faculty of Health and Medical Sciences, University of Copenhagen, 20 Nørre Allé, 2200, Copenhagen, Denmark. ik@sund.ku.dk.
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I
Kjær
D000293:Adolescent; D000848:Anodontia / Q000000981:diagnostic imaging; D001641:Bicuspid / Q000000981:diagnostic imaging; D002508:Cephalometry / Q000379:methods; D002648:Child; D003481:Cuspid / Q000000981:diagnostic imaging; D005260:Female; D006801:Humans; D007180:Incisor / Q000000981:diagnostic imaging; D008297:Male; D008310:Malocclusion / Q000000981:diagnostic imaging*; D011862:Radiography, Panoramic / Q000379:methods; D063173:Retrognathia / Q000000981:diagnostic imaging; D012737:Sex Factors; D014071:Tooth Abnormalities / Q000000981:diagnostic imaging*; D014079:Tooth Eruption, Ectopic / Q000000981:diagnostic imaging*; D014092:Tooth Root / Q000002:abnormalities
Agenesis; Craniofacial radiography; Taurodontia; Transposition