ABSTRACT
O presente estudo tem como objetivo analisar as dimensões dos arcos pré-contornados de Nitinol e sua correlação com a morfologia da arcada dentária inferior. Foram utilizados trinta e dois modelos em gesso de indivíduos com má oclusão Classe II, divisão 1, cuja morfologia da arcada inferior foi comparada à forma de arcos pré-contornados de NiTi de três marcas. Foram obtidas imagens digitais dos modelos e dos arcos, e com o auxílio do programa Cef X (CDT Software, versão 2.3.20), foi mensurada a distância transversal entre o arco analisado e as pontas de cúspide dos dentes 34, 35, 44, 45. Observou-se que todos os arcos pré-contornados avaliados apresentam uma tendência a expandir a morfologia da arcada dentária normal. Porém, os arcos da marca TP Orthodontics apresentam uma morfologia mais próxima à forma da arcada em oclusão normal, quando comparados aos arcos das marcas 3M Uniteck e G&H Wire (p>0,05). Visto que todos os arcos pré-contornados avaliados possuem a tendência de expandir a morfologia normal da arcada dentária, é prudente individualizar os arcos utilizados para cada paciente, com o objetivo de alcançar resultados mais estáveis.(AU)
The present study aims to analyze the dimensions of pre-contoured Nitinolarches and its correlation with the morphology of the lower dental arch. Thirty-two plaster casts of individuals with Class II malocclusion were used in this study to compare the morphology of lower dental arch with the shape of NiTi pre-contoured archwire. Digital images were obtained from plaster casts and from the archwires, and after the superposition of the images, the computer software Cef X (CDT Software, version 2.3.20) was used to measure the lateral distance between the archwire analyzed and the cusp tips of teeth 34, 35, 44, 45. It was observed that all pre-contoured archwires evaluated have tendency to expand the morphology of lower dental arch. However, the TP Orthodontics archwires presented a more similar shape to the morfology of lower dental arch, when compared to the 3M Uniteck and G&H Wire archwires (p>0.05). Since all pre-contoured archwires studied have a tendency to expand the normal morphology of the dental arches, it is prudent to individualize the arches used for each patient in order to achieve more stable results.(AU)
Subject(s)
Humans , Dental ArchABSTRACT
Objective: The aim of this study was to evaluate in vitro the effects of frequently ingested beverages on force degradation of intermaxillary elastics. Material and Methods: One hundred and eighty 1/4-inch intermaxillary elastics (TP Orthodontics) were immersed into six different beverages: (1) Coca-Cola®; (2) Beer; (3) Orange juice; (4) Red wine; (5) Coffee and (6) artificial saliva (control). The period of immersion was 15 min for the first and second cycles and 30 min for the third to fifth cycles. Tensile forces were read in a tensile testing machine before and after the five immersion cycles. One-way repeated measures ANOVA was used to identify significant differences. Results: Force degradation was seen in all evaluated groups and at all observation periods (p<0.05). A greater degree of degradation was present at the initial periods, decreasing gradually over time. However, no statistically significant differences were seen among groups at the same periods, showing that different groups behaved similarly. Conclusion: The chemical nature of the evaluated beverages was not able to influence the degree of force degradation at all observation periods.
Subject(s)
Humans , Beverages , Dental Materials/chemistry , Latex/chemistry , Orthodontic Appliances , Analysis of Variance , Materials Testing , Rubber/chemistry , Saliva, Artificial/chemistry , Tensile Strength , Time FactorsABSTRACT
Na primeira infância, a sucção de dedo ou dedos pode ser considerada normal, porém, se o hábito persistir na segunda infância, o mesmo pode tornar-se prejudicial. Os hábitos bucais deletérios dependem de fatores como duração, frequência, intensidade, bem como do padrão facial, podendo interferir no crescimento e desenvolvimento dentoalveolar, favorecendo o aparecimento de más oclusões e alterações nos padrões normais de deglutição e fonação. Para a eliminação do hábito de sucção de dedo, a participação familiar, interação profissional multidisciplinar e, principalmente, a vontade do paciente, são relevantes e devem ser consideradas. O presente trabalho ilustra o caso clínico de um paciente com má oclusão Classe II, divisão 1, com hábito de sucção do dedo médio da mão direita de maneira intensa e com as consequências minimizadas pelo padrão facial braquifacial. A obtenção de estética e função foram decorrentes do binômio de cooperação em remover o hábito e domínio da biomecânica ortodôntica.
The thumb-sucking habit in childhood is very common and can develop malocclusion and modify the normal patterns of swallowing and speech, depending on some factors as dura-tion, frequency, intensity and facial pattern. The parents, compliance, multidisciplinary in-teraction and patients willingness should be also considered. The article illustrates a case of an Angle Class II ,1 malocclusion with a thumb-sucking habit and consequences minimized by brachyfacial pattern. The esthetics and function were achieved mainly because the patient compliance in stopping with the habit and the management of orthodontic biomechanics.