ABSTRACT
Objective@#To investigate changes in the three⁃dimensional position of the maxillary canine during the distal movement of the maxillary first molar by a mini⁃implant combined with a CD appliance.@*Methods@#Ten typodont models of class II malocclusion were selected, and one side was randomly chosen as the experimental group. The CD ap⁃ pliance was bonded to the maxillary canine and first molar of the experimental group, and 1.2 mm stainless steel wire was bent as the anchorage, which was fixed on the model to simulate mini⁃implants implanted in the zygomatic alveolar ridge. Then, 180 g orthodontic force was applied to the canine of the experimental group; the other side was recognized as the control group and was not used for strengthening. Six mini⁃implants were implanted in different parts of the mod⁃ el and used as a reference before and after the experiment. The models were placed in an incubator and heated at 56 ℃ in a water bath for 2 min. The models were scanned before and after thermostatic water bath treatment with a 3⁃shape scanner. Then, the digital models were overlapped through the reference points, and the positions of the canines and first molars were measured before and after the experiment.@*Results@#The sagittal movement distance of the first molar in the experimental group was ( 0.25 ± 0.33) mm, and the vertical movement distance was (0.25 ± 0.28 )mm, which was significantly different from the control group (P < 0.05), while the transverse change was not significantly different (P > 0.05). There was no significant difference in the root position of the first molar in the experimental group (P > 0.05). The lateral and vertical displacement distances of the maxillary canine crown in the experimental group were (4.03 ± 2.11) mm and (1.86 ± 1.01) mm, respectively, which were significantly different from those in the control group (P < 0.001), while the sagittal changes showed no significant differences (P > 0.05). In the experimental group, there was no significant difference in the position of the apex of the maxillary cusp (P > 0.05).@*Conclusion@#Our in vitro study showed that the maxillary canines inclined buccally accompanied by a small amount of intrusion during molar distaliza⁃ tion by a mini⁃implant combined with a CD appliance.
ABSTRACT
Age estimation plays a very important role in individual recognition in forensic dentistry. Morphological data of 3D pulp cavity of maxillary canines were acquired by oral and craniofacial CT scans. In accordance with inclusion criteria, CT data of 103 patients (51 males and 52 females) were collected at the Department of Radiology, Stomatological Hospital, Shanxi Medical University, China from September 2015 to August 2016. Mimics 17.0 software was used to measure pulp volume of maxillary canines and tooth volume, and to calculate the ratio of pulp volume/tooth volume. SPSS 16.0 software was utilized to analyze and establish database. Linear regression analysis was applied to process data and to establish a linear regression equation for individual age: Y=69.137-621.200 (pulp volume/tooth volume), R=0.544. Subjects were grouped according to gender, deriving the inferred function of male age: Y=64.333-468.811 (pulp volume/tooth volume), R=0.435; the inferred function of female age: Y=76.445-843.186 (pulp volume/tooth volume), R=0.691. The ratio of pulp volume to tooth volume can be used to infer individual age, and can provide a new method and pathway for individual recognition in forensic dentistry.
La estimación de la edad juega un papel importante en el reconocimiento individual en la odontología forense. Los datos morfológicos de la cavidad pulpar tridimensional de los caninos maxilares fueron adquiridos por tomografía computarizada oral y craneofacial. De acuerdo con los criterios de inclusión, se recolectaron datos de 103 pacientes (51 hombres y 52 mujeres) en el Departamento de Radiología del Hospital de Estomatología de la Universidad de Medicina de Shanxi, desde septiembre de 2015 hasta agosto de 2016. Se utilizó el software Mimics 17.0 para medir el volumen de pulpa de los caninos maxilares y el volumen del diente, además, se calculó la relación entre el volumen de la pulpa y el volumen del diente. Se utilizó el software SPSS 16.0 para analizar y establecer las bases de datos. El análisis de regresión lineal se aplicó a los datos del proceso y para establecer la edad individual se aplicó una ecuación de regresión lineal: Y = 69.137-621.200 (volumen de la pulpa / volumen del diente), R = 0.544. Los sujetos se agruparon según el sexo, derivando la función inferida de la edad masculina: Y = 64.333-468.811 (volumen de la pulpa / volumen del diente), R = 0.435; La función inferida de la edad de la mujer: Y = 76.445-843.186 (volumen de la pulpa / volumen del diente), R = 0.691. La relación entre el volumen de la pulpa y el volumen del diente puede usarse para inferir la edad individual y puede proporcionar un nuevo método y forma para el reconocimiento individual en la odontología forense.
Subject(s)
Humans , Male , Female , Age Determination by Skeleton , Cuspid/anatomy & histology , Dental Pulp Cavity/anatomy & histology , Forensic Dentistry , Tomography, X-Ray Computed , Linear Models , Cuspid/diagnostic imaging , Dental Pulp Cavity/diagnostic imagingABSTRACT
Objective:To identify the factors that affect the duration of forced eruption of the impacted maxillary canines.Methods:Data of 46 successfully treated impacted maxillary canines with forced eruption were included.The relation of duration of forced eruption and the age of the patients(y),the distance between the impacted maxillary canine cusp tip and the occlusal plane(d),the angle be-tween the axis of the impacted maxillary canine and the occlusal plane(α),mesiodistal position of the canine cusp tip in relation to the adjacent teeth(ZB),the angle between the canine axis and the lateral incisor axis(β)was analyzed.Results:The results indicated a direct correlation of the duration of forced eruption with the patient age and d value,the more mesial location of the canine cusp tip to the midline,the longer treatment time was needed.In contrast,there was an inverse correlation between the duration of forced eruption and αvalue.Conclusion:The patient's age and the position of the impacted maxillary canines are the important predictors of the dura-tion of the forced eruption.
ABSTRACT
INTRODUÇÃO: a tração de dentes não irrompidos sempre foi considerada um procedimento de risco na prática ortodôntica. Com essa perspectiva, é indispensável a busca por eficiência nos procedimentos adotados para esse mister, o que justifica a proposta do presente artigo. Ao perfurar, vazamos uma estrutura natural, cuja restauração com material artificial é uma ação que está no escopo da área de maior evolução da Odontologia, não havendo justificativa para se evocar procedimentos de maior risco, como a colagem ou laçada com fios. OBJETIVO: este artigo objetiva apresentar protocolos para a Perfuração do Esmalte para o Tracionamento de Caninos (PETC), especificamente os caninos superiores, mais acometidos pelas anomalias de posicionamento, também denominadas disgenesias. Serão abordadas as vantagens e desvantagens da PETC em relação à Colagem de Acessório para o Tracionamento de Caninos (CATC), apresentando-se casos clínicos de diferentes níveis de complexidade, tendo como ponto de partida a literatura e a experiência clínica de 30 anos com elevado índice de sucesso.
INTRODUCTION: The management of unerupted teeth has always been considered as a challenging procedure in orthodontic practice. Within this perspective, the search for effectiveness in the procedures adopted for the management of unerupted teeth is essential, which explains the purpose of the present paper. When enamel drilling is performed, a natural structure is transfixed, which may be restored with composite material and may dispense from risky procedures such as bonding attachment technique and lasso wire technique.OBJECTIVE: The present paper aims to present protocols for enamel drilling for canine traction (EDCT), specifically for maxillary canines, the most frequent teeth showing tooth position anomalies. In this paper, clinical cases with different degrees of complexities were illustrated, and, based upon the literature review and the 30 years of expertise with high rate of clinical success, advantages and disadvantages are discussed comparing EDCT and accessory bonding for canine traction (ABCT).
Subject(s)
Child , Cuspid , Dental Enamel , Tensile Strength , Orthotic Devices , Dental Bonding , Dental Pulp , Malocclusion , Tooth Movement Techniques , Tooth, ImpactedABSTRACT
El proceso de desarrollo de los caninos permanentes superiores es entre todos los dientes el más demorado y de trayecto más largo. En el periodo de transición para la dentición permanente podrá ocurrir la no erupción de estos dientes. El diagnóstico precoz de esta anomalía es fundamental para el correcto desarrollo de la dentición y oclusión y para un tratamiento efectivo y rápido. Por lo tanto, el propósito de este trabajo fue revisar algunos aspectos concernientes a la etiología, diagnóstico y conduta clínica en casos de caninos superiores impactados
he canine development process is the most delayed process of all teeth and also the one that takes the longest path until its eruption. During the period of transition from the mixed denture to the permanent one it may occur some problems of dental impactions. Early diagnosis of this anomaly is of major importance to have a proper occlusion development and to have a more efficient and short treatment. Therefore, it was purpose with this study, to review some aspects concerning to the etiology diagnosis and clinical conduct of canines maxillary impactions