Cuspid transposition and treatment timing. Case report.
An example of early treatment where timing is crucial to accomplishing the greatest possible dental health benefit, with the added bonus of minimizing mechanical therapy.
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Results for “TOOTH ERUPTION, ECTOPIC”
Explore indexed PubMed citations for clinical trials, systematic reviews and public health research. Read source abstracts and follow each citation to its original PubMed record.
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Incisor resorption caused by maxillary cuspids. A radiographic study.
A detailed radiographic study of 46 cases of maxillary incisor resorption related to unerupted cuspids finds most resorption in midroot, with about half on labial or lingual surfaces where it was not detectable on periapical radiographs. Resorption appears early, making it desirable to evaluate cuspid position no later than 10 or 11 years of age.
Adolescent↗
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.
Adolescent↗
Case report BC. Early identification and correction of transposed teeth.
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Adolescent↗
New findings expose the palatally displaced canine.
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Cuspid↗
The palatally displaced canine as a dental anomaly of genetic origin.
Palatal displacement of the maxillary canine tooth is a positional variation thought generally to develop as a result of local factors, such as retained deciduous canines, anomalous permanent lateral incisors, or dental crowding. This article contributes biologic evidence pointing to genetic factors as the primary origin of most palatal displacements and subsequent impactions of maxillary canine teeth. Data gathered from multiple sources are integrated to support a genetic etiology for the palatally displaced canine (PDC) on the basis of five evidential categories: 1. Occurrence of other dental anomalies concomitant with PDC; 2. Bilateral occurrence of PDC; 3. Sex differences in PDC occurrence; 4. Familial occurrence of PDC; 5. Population differences in PDC occurrence. From analysis of available evidence, the PDC positional anomaly appears to be a product of polygenic, multifactorial inheritance.
Cuspid↗
Two patients with severely displaced maxillary canines respond differently to treatment.
The patient with a severely displaced maxillary canine continues to challenge the orthodontic specialist. When the two patients in the following case reports presented, their problems seemed similar: each had a palatally displaced canine. However, unique clinical problems were soon diagnosed that led to the development of different treatment approaches. These differences are worth discussing, especially in light of newly published studies. In planning treatment for these two patients, the following questions are worth considering. 1. Is it common for other dental anomalies (small lateral incisors, missing teeth) to occur more frequently in patients with palatally displaced canines? 2. Following surgical exposure of palatally displaced maxillary canines, how significant are the risks of tooth movement with regard to periodontal health, vitality, and retention? 3. Are new or improved surgical procedures becoming available to bring severely impacted teeth into alignment? 4. When planning ahead to replace a missing premolar with an endosseous implant, is it better to retain the primary molar as long as possible or extract it during treatment? 5. How stable is the closure of a maxillary median diastema years after a reasonable period of retention?
Adolescent↗
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.
Adolescent↗
Canine transposition in prehistoric Pakistan: Bronze Age and Iron Age case reports.
This report documents two prehistoric cases of canine-first premolar transposition (Mx.C.P1) from the Indo-Pakistan subcontinent. Recent discussion of the etiology of canine transposition and reports of high prevalence for the condition in modern India accentuate the significance of the ancient cases reported there. Case 1 is from the Iron Age site of Sarai Khola in northern Pakistan (1000 BC). The specimen, an adult female, 25 to 30 years of age at death, exhibits unilateral Mx.C.P1 transposition on the left side. The condition is associated with a barrel-shaped maxillary left third molar in an otherwise normal and healthy maxillary dental arch. Case 2 is from the Bronze Age urban site of Harappa (2500 BC), an important center of the Indus Valley Civilization. In this specimen, an adult female, transposition is bilateral, resulting in displacement of premolars and large diastemata between the maxillary lateral incisors and first premolars. Bilateral agenesis of maxillary third molars and rotation of maxillary and mandibular teeth occur with transposition in this specimen. In neither case are the lateral incisors reduced in size, peg-shaped, or congenitally absent. This report of Mx.C.P1 transposition in prehistoric times is significant because it provides historical documentation for the female predilection of the trait and establishes its co-occurrence with specific dental variants, such as agenesis, reduction, and rotation of teeth.
Bicuspid↗
Tooth-size reduction associated with occurrence of palatal displacement of canines.
This study investigates mesiodistal crown size of the maxillary and mandibular incisors of patients with palatally displaced canines (PDC). Pretreatment dental casts of orthodontic patients with PDC of 1 or both maxillary canines (N = 31; M10:F21) were collected. This PDC sample was matched according to age and sex with pretreatment dental casts from unaffected orthodontic patients. For the PDC and matched control samples, maximum mesiodistal crown diameters were recorded for the 4 incisors on the left side only. The results showed that, on average, the mesiodistal crown diameters for the maxillary and mandibular incisors measured smaller in the PDC sample than in the control sample. These findings of statistically significant tooth-size reductions associated with PDC occurrence indicate a generalized pattern of reduced tooth size as a characteristic associated with the PDC anomaly. Further, the presence of generalized tooth-size reduction in cases with palatally displaced canines helps explain why most orthodontic treatment plans for PDC patients are of the nonextraction type.
Adolescent↗
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.
Adolescent↗
Orthodontic correction of a transposed maxillary canine and lateral incisor.
Tooth transposition presents a major challenge in the correction of a malocclusion. A dental transposition is an uncommon disturbance affecting 0.4% of the population, yet the treatment difficulties make this anomaly an occurrence of orthodontic interest and a source of clinical interest. This case report shows the unilateral transposition of a maxillary canine with a lateral incisor that was treated by orthodontically reversing the transposed tooth positions. An analysis of the clinical concerns in the treatment of this problem is presented.
Bicuspid↗
Transmigrant mandibular canines: a record of 28 cases and a retrospective review of the literature.
The transmigrant mandibular canine is a rare phenomenon. Most authors have described singular cases of unilateral or bilateral occurrence; however, a few authors have published more cases. This paper describes 28 cases exhibiting transmigratory canines. The observations are compared with observations from 39 earlier reports. Women are affected more than men. The left canine undergoes transmigration more commonly than does the right canine. Transmigration and impaction appear to be more common. Most of the patients do not have any symptoms, and these canines are often discovered at the radiological examination before orthodontic treatment. The etiology is obscure; however, abnormal displacement of the tooth bud in embryonic life is a commonly accepted explanation. Prolonged retention of the deciduous canine is a good clinical sign for a thorough radiological examination, preferably including an orthopantomographic radiograph. This would help in preventive measures. However, once established, a transmigrated canine requires surgical extraction. If possible, and if space is available and the patient is willing, all orthodontic efforts should be made to restore the normal position of this functionally very useful tooth in the human dentition.
Adolescent↗
An orthodontic case of transposition of the upper right canine and first premolar.
Tooth transposition is a rare and severe positional anomaly that may create many orthodontic problems from both esthetic and functional points of view. In this report, we describe a case of the orthodontic management of a transposition of the upper canine and premolar with congenital absence of the upper lateral incisor. The patient was treated with a multibracket appliance and the extraction of three premolars, and treatment was completed without a need for any prosthetic replacement.
Anodontia↗
Stress distribution produced by the correction of the mandibular second molar in lingual crossbite.
The purpose of this study was to evaluate the stress distribution produced in the dentoalveolar system by a mandibular posterior crossbite appliance used for the correction of mandibular second molars in lingual version. A photoelastic model was fabricated using a photoelastic material (PL-3) to simulate alvelolar bone and ivory-colored resin teeth. The model was observed anteriorly and posteriorly with a circular polariscope and photographically recorded before and after activation of mandibular posterior crossbite appliances. An uncontrolled tipping and an extrusive force were generated when the traction force was applied on the buccal surface of the mandibular second molar. A controlled tipping and an intrusive force were generated when the traction force was applied on the lingual surface of the mandibular second molar. We concluded that to escape the extrusion and uncontrolled tipping that creates occlusal interferences associated with the correction of mandibular second molars in lingual version, the lingual traction force is more useful than the buccal traction force.
Birefringence↗
Treatment of a patient with an impacted transmigrant mandibular canine and a palatally impacted maxillary canine.
Very few people have seen transmigrant mandibular canines and little has been presented in the literature about this rare phenomenon. In this case report, identification techniques and treatment options are presented along with the treatment results of a patient diagnosed with a transmigrant mandibular canine. This rare condition usually requires extraction of the involved tooth because orthodontic forces are seldom successful at erupting these teeth into their proper location. The treatment protocol for this patient involved a combination of orthodontic procedures, surgical extractions, gingivectomy and frenectomy, and implant replacement of the impacted transmigrant tooth. Through a collaborative effort of a team made up of an orthodontist, periodontist, prosthodontist, and oral surgeon, these techniques were used to achieve an excellent esthetic and functional outcome.
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Palatally displaced canine anomaly in monozygotic twins.
The palatally displaced canine (PDC) anomaly is a tooth malposition occurring in 1% to 3% of most populations. From the results of family studies, the PDC phenotype appears to be under strong genetic influence. In this study we report monozygotic (MZ) twin girls with bilateral PDC expression. The finding of PDC anomaly in MZ twins--to our knowledge, the first such published case--lends further support to evidence of genetic control of the PDC anomaly.
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