El uso de un cantiléver para el tratamiento ortodóncico del incisivo impactado en posición horizontal / Use of a cantilever for orthodontic treatment of the impacted incisor in a horizontal position

Introducción: La falta de un incisivo permanente no solo genera un efecto adverso en la estética facial, también altera la función, en especial, la guía incisiva. Los incisivos superiores pueden sufrir bloqueo mecánico o cambio en su erupción por un diente supernumerario, un golpe u otro factor. El tratamiento de elección es el quirúrgico-ortodóncico. El pronóstico dependerá de la edad, situación, posición del diente, morfología, tamaño, maduración radicular y método de tracción. Conocer el uso de una aparatología ortodóncica que sea fácil de manipular y pueda ser usada desde edades tempranas servirá de valioso aporte. Objetivo: Mostrar el uso exitoso de un cantiléver para traccionar ortodóncicamente un incisivo impactado en posición horizontal. Presentación del caso: Paciente de 8 años con maloclusión clase I, pieza 2.1 retenida en posición horizontal, presencia de supernumerario y persistencia de pieza 6.1. Se opta por extracción de supernumerario, liberación de pieza 2.1 y tracción ortodóncica. Se usó un cantiléver por vestibular confeccionado en arco de acero redondo 0.020" con dos círculos en cada extremo para brindar elasticidad y anclaje. La fuerza utilizada fue de 70 g, pasado 6 meses se alcanzó el plano de oclusión. Se cementaron brackets y tubos, se continuó con la secuencia de arcos, hasta llegar al arco acero 0.021"x0.025" durante 11 meses. Se obtiene una posición final óptima que favorece la formación radicular y cierre apical. Conclusiones: El uso del cantiléver para el tratamiento ortodóncico de incisivos permanentes impactados en posición horizontal demostró ser exitoso, fácil de manipular y controlar(AU)

Introduction: The lack of a permanent incisor not only generates an adverse effect on facial aesthetics but also alters its function, especially the incisor guidance. Upper incisors can suffer mechanical blockage or change in their eruption due to a supernumerary tooth, a blow or another factor. The treatment of choice is orthodontic-surgical. The prognosis depends on the age, tooth position, morphology, size, root maturation and traction method. Knowing the use of an orthodontic appliance, which is easy to handle and can be used from an early age, will be of valuable contribution. Objective: To show the successful use of a cantilever to enable orthodontic traction of an impacted incisor in a horizontal position. Case presentation: Eight-year-old patient with class I malocclusion, specimen 2.1 retained in a horizontal position, presence of supernumerary tooth and persistence of specimen 6.1. Extraction of the supernumerary, release of specimen 2.1 and orthodontic traction is chosen. A buccal cantilever made of a 0.020" round steel arch with two circles at each end was used to provide elasticity and anchoring. The force used was 70 g. Six months after, the occlusion plane was reached. Brackets and tubes were cemented and the sequence of arches was continued until the 0.021"x0.025" steel arch was reached in 11 months. An optimal final position is obtained, favoring root formation and apical closure. Conclusions: The use of the cantilever for orthodontic treatment of impacted permanent incisors in a horizontal position proved to be successful as well as easy to manipulate and control(AU)

Characteristics and Treatment Methods of Eruption Disturbance / 대한소아치과학회지

The purpose of this study was to investigate the distribution of eruption disturbance and to analyze its causes, treatment methods, and duration of orthodontic traction, based on 703 patients with eruption disturbance who were treated in the pediatric dental clinic of Seoul National University Dental Hospital between July 2011 and June 2016.Eruption disturbance in pediatric patients was most prevalent in the maxillary canine, followed by the maxillary central incisor and maxillary first molar. Eruption disorder of the maxillary canine was more common in females (p < 0.001), whereas the maxillary central incisor (p = 0.009), maxillary first molar (p < 0.001) and mandibular first molar (p = 0.028) were more common in males than females.The most common causes of eruption disturbance were abnormality of the eruption pathway and the presence of obstacles in the pathway. Orthodontic traction was the most prevalent treatment choice for eruption disorder, mostly done for the maxillary central incisors. The duration of orthodontic traction was shorter with younger age (p < 0.001) and lower crown position (p < 0.001).It is important for pediatric patients to detect eruption disorders early through regular checkup, and it is necessary to initiate treatment at an appropriate time with an accurate diagnosis and treatment plan.

The relationships between the arrangement of teeth, root resorption, and dental maturity in bovine mandibular incisors / 대한치과교정학회지

OBJECTIVE: The objective of this study is to investigate the eruption pattern and root resorption of the bovine anterior dentition in relation to growth-related parameters based on dental maturity. METHODS: A cross-sectional study was conducted on 110 bovine anterior mandibles by using standard radiography, cone-beam computed tomography (CBCT), and actual measurements. We determined the relationships between the stages of dental maturity by using a modification of Demirjian's method and various growth-related parameters, such as the activity of the root-resorbing tissue and mobility of the deciduous teeth. The correlation of growth-related parameters with interdental spacing and distal unusual root resorption (DRR) of the deciduous fourth incisor was assessed. The cause of mesial unusual root resorption (MRR) of the deciduous fourth incisor was determined on the basis of the arrangement of the permanent third incisor. RESULTS: An independent t-test and chi-square test indicated significant differences in growth-related parameters associated with dental arch length discrepancy and factors related to the shedding of deciduous teeth between the low and high dental maturity groups. The samples with interdental spacing and DRR showed a larger sum of mesiodistal permanent crown widths and higher dental maturity than did the respective controls. Samples with MRR tended to show a lingually rotated distal tip of the adjacent tooth crown. CONCLUSIONS: Dental maturity has relevance to the interdental spaces and unusual root resorption of mixed dentition. The position of the adjacent tooth crown on CBCT may be correlated with the occurrence of unusual root resorption of the incisor.

Rare Patterns of Impacted Mandibular Teeth: A Case Series.

Tooth eruption is the axial movement of the tooth from its developmental position within the jaws to the functional position in the occlusion plane. Any interference in the complex sequential events or pathology of the surrounding bone may cause diffi culty in eruption. Th is may cause an ectopic eruption and aberrant eruption pattern. Th is process might be altered by genetic, molecular, cellular or tissue causes too. Impacted teeth may therefore, be non-functional, abnormal or pathological. Moreover, ectopic eruption of second molars is rarely seen and infrequent. Here we report a case series of ectopic eruption of permanent mandibular molars with some rarest presentation.

Dentoskeletal features in individuals with ectopic eruption of the permanent maxillary first molar / 대한치과교정학회지

OBJECTIVE: The aim of the study was to analyze the prevalence and distribution of ectopic eruption of the permanent maxillary first molar (EEM) in individuals scheduled for orthodontic treatment and to investigate the association of EEM with dental characteristics, maxillary skeletal features, crowding, and other dental anomalies. METHODS: A total of 1,317 individuals were included and randomly divided into two groups. The first 265 subjects were included as controls, while the remaining 1,052 subjects included the sample from which the final experimental EEM group was derived. The mesiodistal (M-D) crown width of the deciduous maxillary second molar and permanent maxillary first molar, maxillary arch length (A-PML), maxillomandibular transverse skeletal relationships (anterior and posterior transverse interarch discrepancies, ATID and PTID), maxillary and mandibular tooth crowding, and the presence of dental anomalies were recorded for each subject, and the statistical significance of differences in these parameters between the EEM and control groups was determined using independent sample t-tests. Chi-square tests were used to compare the prevalence of other dental anomalies between the two groups. RESULTS: The prevalence of maxillary EEM was 2.5%. The M-D crown widths, ATID and PTID, and tooth crowding were significantly greater, while A-PML was significantly smaller, in the EEM group than in the control group. Only two subjects showed an association between EEM and maxillary lateral incisor anomalies, which included agenesis in one and microdontia in the other. CONCLUSIONS: EEM may be a risk factor for maxillary arch constriction and severe tooth crowding.

Frecuencia de transposición dental en las clínicas de postgrado de odontología de la Universidad Autónoma de Nayarit / Frequency of dental transposition at the postgraduate dental clinics of the Autonomous University of Nayarit

La transposición dental es una anomalía poco común que se presenta enalrededor de un caso por cada 300 pacientes. Se limita a los dientes permanentes, ocurre con mayor frecuencia en el maxilar y puede ser unilateral o bilateral. Objetivos: Conocer la frecuencia por sexo de la transposición dental y qué dientes se ven afectados más usualmente. Material y métodos:El estudio es descriptivo, transversal y retrospectivo. El tamaño de la muestra fue de 445 modelos de estudio retratamiento de ortodoncia; el tamaño de muestra se calculó con un nivel de confianza del 99 por ciento, con un error del 3 por ciento y una prevalencia calculada del 10 por ciento. Se incluyeron los modelos con todos los dientes erupcionados –con excepción del tercer molar- y se excluyeron los dientes cuya anatomía pudiera estar alterada por fracturas, cavidades, desgastes y restauraciones. Conclusiones: La frecuencia de la transposición fue de 1.3 por ciento; la frecuencia fue mayor en mujeres, con un 2 por ciento; en hombres fue de 0.5 por ciento de la población.

Dental transposition is a rare anomaly, the frequency being around one case in every 300 patients. It affects only permanent teeth and is more common in the maxilla. It can be unilateral or bilateral. Objectives:To determine the frequency of dental transposition, in which sex it is more common, and which teeth are most commonly affected. Material and methods: A descriptive, cross-sectional, retrospective study was performed. The sample consisted of 445 pretreatment orthodontic study models; the sample size was calculated with a confidence level of 99% and error of 3%, the prevalence being estimated as 10%. The models included were those with all teeth erupted, except for the third molars: teeth in which the anatomy may have been altered by wear, fractures, cavities, and restorations were excluded. conclusions: The frequency of transposition was 1.3%, being higher in women (2%) than in men. (0.5%)

A Dentigerous Cyst Containing An Ectopic Canine Tooth In Maxillary Sinus Roof : A Case Report.

Ectopic eruption in to dental component is common, where as eruption into other site is rare. anatomical areas such as palate, maxillary sinuses and nasal cavity can infrequently be the site of ectopic tooth eruption . one of the non dental sites for ectopic eruption is the maxillary sinus. Here, we present a case of dentigerous cyst with an ectopic maxillary canine located in maxillary sinus roof below the floor of the orbit in a 8-years-old boy.

Ectopic eruption of lower lateral incisors: initial treatment with removable appliance: case report / Erupção ectópica de incisivos laterais inferiores: tratamento inicial com aparelho removível: relato de caso

The aim of this article was to present an alternative to the treatment of lower lateral incisors with ectopic eruption using a removable appliance with digital springs. The treatment showed the efficacy of this appliance in the clinical case reported - early stage of mixed dentition - avoiding the development of a dental transposition and making the final stages with fixed appliance easier.

O objetivo deste artigo foi apresentar uma alternativa de tratamento para correção de incisivos laterais inferiores com erupção ectópica através do uso de aparelho removível com molas digitais. O artigo demonstrou a eficácia deste tipo de aparelho no caso clinico apresentado - estágio precoce da dentadura mista - evitando o estabelecimento de uma transposição dentária e facilitando a finalização do caso com o uso de aparelho ortodôntico fixo.

Transposición dentaria maxilar: reporte de un caso y revisión de la literatura / Transposition tooth jaw: a case report and review of the literature

La transposición dentaria es una anomalía dental poco frecuente, ocasionando una mal oclusión dental y una serie de complicaciones tanto estéticas, funcionales, y legales al momento de su hallazgo. Se presenta una revisión de la literatura y reporte de caso en un 1er premolar transposicionado con un canino superior izquierdo en un paciente de 20 años de sexo femenino.

Tooth transposition is a rare dental anomaly, causing dental malocclusion and a series of complications, both aesthetic and functional, and legal at the time of its discovery. A review of the literature and case report in a 1st premolar transposition with left upper canines in a patient of 20 years old female.

Early orthodontic treatment of unilateral mandibular left lateral incisor–canine transposition: A Case Report

Among dental anomalies, tooth transposition is considered the most difficult to manage clinically. Distal migration of permanent mandibular lateral incisor happens rarely. It can be discovered radiographically in the early mixed dentition & interceptive treatment is often appropriate. If left uncorrected it may erupt ectopically and the results are often unsatisfactory both esthetically and functionally. When transpositions are detected early the positions of the root apices are important in deciding where to move the transposed tooth. This article reports a case of early orthodontic treatment of a rare unilateral mandibular left lateral incisor – canine transposition.

Alteraciones en la erupción de caninos permanentes / Canine permanent eruption alterations

En este trabajo son descritas alteraciones en la erupción de los caninos permanentes, su etiología, diagnóstico temprano y posibilidades terapéuticas. El canino recoge todos los problemas de espacio que puedan existir en la arcada y es frecuente la erupción en una zona alta. La inclusión de los caninos tiene una etiología compleja, favorecida por factores evolutivos, anatómicos y mecánicos. La impactación mandibular es menos frecuente y su incidencia se describe como veinte veces menos que la impactación del canino maxilar. La erupción ectópica de los caninos maxilares puede estar asociada a la reabsorción de las raíces de los incisivos adyacentes. A la edad de 8 a 10 años empieza a palparse la prominencia del canino en el fondo del vestíbulo. Los métodos radiográficos más utilizados son las radiografías panorámica, oclusal y periapical, con técnicas de tubo vertical y otras angulaciones. En la actualidad, es de gran ayuda la tomografía computarizada. El término tratamiento temprano implica una terapéutica en estadios precoces de desarrollo, cuando la patología puede ser interceptada o detenida y los tratamientos más utilizados son exodoncia de caninos temporales y extracción seriada. En conclusión, las alteraciones en la erupción de caninos permanentes requiere conocimiento de los parámetros de normalidad, cronología y secuencia, junto a la aplicación de pruebas complementarias, para poder efectuar una evaluación temprana y pertinente y evitar las complicaciones derivadas de un diente impactado.

This study describes the alterations in the eruption of the permanent canines, etiology, early diagnosis and therapeutic possibilities. The canine one gathers all the problems of space that can exist in the arches and is frequent the eruption in a high zone. The inclusion of the canine has a complex etiology, favored by evolutionary, anatomical and mechanical factors. The mandibular impaction is less frequent and its incidence is described less like twenty times than the impaction of the maxilar canine one. The ectopic eruption of maxillary canines can be associated to the reabsorbing by the roots of the adjacent incisors. From 8 to 10 years begins to be noticed the prominence of the canine in the bottom of vestibule The most used radiographies methods are the panoramic x-ray, oclusals and periapicals with techniques of vertical tube and other angles. At the present time it is helpful the computed tomography. The term "early treatment" implies a therapeutic action in early stages of development, when the pathology can be intercepted or stopped, and the most used are exodontias of temporary canines and serial extraction. In conclusion, the canine alterations of the eruption of permanent involve knowledge of the normality parameters, chronology and sequence, along with the development of complementary tests, to carry out an early and pertinent evaluation and to avoid the complications derived from an impacted tooth.

The Influence of anterior crossbite on the position and morphology of teeth / 实用口腔医学杂志

Objective: To study the influence of anterior crossbite on the position and morphology of teeth. Methods: 81 teenagers with permanent dentition and anterior crossbite were in volved in group 1 and 95 teenagers in permanent dentition without anterior crossbite in group 2. The teeth in both groups were compared on their position and morphology. Results:① The percentage of ill-positioned teeth in maxilla in group 1 and in group 2 was 14.0% and 8.8% respectively (P

Application of autogenous teeth transplantation for orthodontic treatment / 实用口腔医学杂志

To find a new way to treat patients with ectopic eruption of canine or impaction canine,autogenous transplantation of those teeth was explored and had good results.