Unilateral and bilateral dental transpositions in the maxilla—dental and skeletal findings in 63 individuals
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This was to elucidate dental and skeletal findings in individuals with unilateral and bilateral maxillary dental transpositions.
Material and 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.
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.
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.
KeywordsAgenesis Craniofacial radiography Taurodontia Transposition
Many sincere thanks to all those orthodontists who contributed with materials for this study. Furthermore, thanks are also due to “Union for Specialized Dentists in Orthodontics” (FSO), for support and establishing contact.
Conflict of interest
The authors declare that there is no conflict of interest regarding the publication of this article.
- Amin F. Prevalence of peg laterals and small size lateral incisors in orthodontic patients-a study. Pak Oral Dent J. 2011;31:88–91.Google Scholar
- Björk A. The relationship of the jaws to the cranium. In: Lundström A, editor. Introduction to orthodontics. New York: McGraw-Hill Book Company Inc.; 1960. CH 7. p. 104–40.Google Scholar