Tooth Transposition Research Articles

Maxillary tooth transpositions: Characteristic features and accompanying dental anomalies

Transposition is a dental anomaly manifested by a positional interchange of 2 permanent teeth. The maxillary permanent canine usually transposes with the first premolar and occasionally with the lateral incisor. The records of 65 orthodontically treated individuals with maxillary tooth transpositions (40 females and 25 males) with an age range of 9 to 25 years (mean age, 13.4 years) were studied to determine the distribution of transposition and to evaluate the accompanying dental anomalies. Thirty-six individuals (55%) had a transposition of the maxillary canines and first premolars, 27 (42%) of the canines and lateral incisors, and 2 (3%) of the central and lateral incisors. Females had 60% more transpositions than did males. Substantially more transpositions were unilateral (88%), with a moderate left side dominance (58%). All dental anomalies associated with transposition--including missing lateral incisors and second premolars, undersized lateral incisors, retained deciduous canines, impaction of permanent canines and central incisors, and severely rotated adjacent teeth--were observed on the side of the transposition. This dominance of the affected side suggested that unknown local factors may play a major role in these dental anomalies. (Am J Orthod Dentofacial Orthop 2001;119:127-34)

Prevalence of tooth transposition, third molar agenesis, and maxillary canine impaction in individuals with Down syndrome.

Alterations in the size, morphology and number of teeth are among the many inherited disorders that have been reported in individuals with Down syndrome. By contrast, third molar agenesis and tooth transposition have been largely ignored and the prevalence of canine impaction has not been reported. The intention of this study was to quantify the occurrence of these anomalies in a group of individuals with Down syndrome, using standardized records, which included a clinical examination, dental casts, and a panoramic radiograph. The results show a notably high prevalence of third molar agenesis (74% of individuals older than 14 years), canine impaction (15%), and maxillary canine/first premolar transposition (15%), compared to published figures from random population samples. These anomalies should not be seen as separate, independent entities, but as associated phenomena. The slow rate of cell growth and a consequent reduced cell number that characterize this syndrome may be responsible for the underdevelopment of the upper jaw, the delayed dental development, the reduction in teeth number and size, and the altered path of canine eruption. No explanation, other than genetics, is immediately available to explain why the maxillary canine/first premolar transposition should represent another phenotypic expression of this trisomy.

A Case Report of the Observation for Long Term Transposition of Teeth

A Case Report of the Observation for Long Term Transposition of Teeth

A study of transposed canines in a sample of orthodontic patients.

Tooth transposition is a positional interchange of two adjacent teeth. The most commonly transposed tooth is the permanent canine with either the first premolar or lateral incisor. The records of 54 subjects with transposed canines, both maxillary and mandibular, were collected. Pretreatment study models of these subjects were matched with a similar number of models from unaffected individuals. Bucco-lingual and mesio-distal tooth widths, arch depth and arch width were measured on each model. Thirty-four subjects (63 per cent) were female. Thirty-seven (68.5 per cent) of the cases involved the maxillary arch and thirty-three (89.2 per cent) of these upper arch transpositions were of the canine and first premolar. In cases involving the lower arch the canine was invariably transposed with the lateral incisor. Peg-shaped lateral incisors, supernumerary and/or congenitally absent teeth occurred in 19 subjects. There were some small, but significant differences in the dimensions of some teeth, however there were no statistically significant differences in arch depths, arch widths and most tooth dimensions in subjects with and without transposed canines. These factors do not appear to be related to the development of canine transposition.

The presentations and management of transposed teeth.

Tooth transposition is an uncommon dental anomaly that nevertheless has important implications regarding treatment. This article describes six types of transposition, discussing the problems and possible solutions. It is important to ensure that the results of any treatments for transposition are both aesthetic and functional.

Transposition of teeth and genetic etiology.

Twenty-one cases of transposition are presented showing a crude prevalence of 0.4%. A high rate of bilateral occurrence was seen. A significant number of cases were associated with other dental anomalies, such as peg-shaped lateral incisors and overretained deciduous teeth. Genetic etiology has been stressed and various other theories discussed.

Classification of maxillary tooth transpositions

Tooth transposition is a severe disturbance of tooth order and eruptive position, involving certain teeth, that may occur at any of several specific sites in the mouth. Published cases of transposition involving maxillary teeth were gathered from worldwide sources to study, identify, and classify these occurrences of orthodontic interest. With a sample of 201 cases and on the basis of anatomic factors, five types of maxillary tooth transpositions were discerned: canine—first premolar (Mx.C.P1), 143 cases; canine—lateral incisor (Mx.C.I2), 40 cases; canine to first molar site (Mx.C to M1), 8 cases; lateral incisor-central incisor (Mx.I2.I1), 6 cases; and canine to central incisor site (Mx.C to I1), 4 cases. AS a benefit from this large-scaled study of an uncommon anomaly, new analyses are presented on cause and treatment aspects for each of these five classes of maxillary tooth transpositions. (AM J ORTHOD DENTOFAC ORTHOP 1995;107:505-17.)

Extraoral tooth eruption and transposition of teeth following trauma

A six-year-old boy presented with extraoral eruption of a mandibular permanent canine and a loosely attached lateral incisor in the labial vestibule, 3 months following trauma to the chin. The trauma not only caused displacement of the permanent tooth buds, but also resulted in transposition of the lateral incisor and canine with subsequent ectopic eruption. The case is presented to demonstrate one of the infrequent complications of trauma involving the unerupted tooth buds of permanent teeth and its unusual clinical presentation.

Tooth transpositions--a review of the literature and treatment considerations.

This paper defines tooth transposition and discusses its history, incidence and possible etiology. An interesting parallel is drawn between tooth transposition and other dental anomalies (number, size, shape and location of teeth). Treatment options are discussed in terms of the age at which the transposition is discovered, as well as in terms of severity and completeness of the anomaly. While a logical and relatively predictable treatment solution should normally be considered, in some selected cases it may be prudent to venture into more complex treatment solutions.

Transposition of teeth

Transposition is a rare dental anomaly. Two cases of transposition of canines have been presented, the causes are discussed, and modes of treatment are suggested.

The problem of transposition of human teeth

Neben den im Schrifttum bereits bekannten Fallen von Transposition oberer Eckzahne werden auch Beispiele von Transposition unterer Kanini gezeigt. Es gibt je nach dem Stadium der Gebisentwicklung und des vorhandenen Raumes zahlreiche Ubergangsformen. Die Ausgangsstellung im Oberkiefer scheint vornehmlich die Eckzahndistopie zu sein. Im Unterkiefer dagegen ist die Lage des Eckzahnkeimes als wesentlich konstanter anzusehen. Nach unseren Beobachtungen mus fur die Transposition unterer Eckzahne in erster Linie ein Abirren des bleibenden seitlichen Schneidezahnes verantwortlich gemacht werden. Die geringe Zahl der untersuchten Falle reicht jedoch fur eine endgultige Beurteilung nicht aus.

Transposition of teeth: H. Mühlemann and G. Antonine. Schweiz. Monatschr. f. Zahnh. 59: 91, 1949

Transposition of teeth: H. Mühlemann and G. Antonine. Schweiz. Monatschr. f. Zahnh. 59: 91, 1949