Influence of low-level laser irradiation on orthodontic movement-clinical and radiographic evaluation This study is a double-blind randomized clinical trial that evaluated the influence of low-intensity laser on orthodontic movement of upper and lower canine teeth, compared to the non-irradiated contralateral canines (control). Eleven patients with Class I malocclusion with indication of extraction of the first upper and lower premolars were selected. The infrared low-level laser was applied after the activation of initial retraction of the canine teeth, performed with NiTi coil springs with force of 150g. The laser application was performed in 10 points (5 buccal and 5 lingual) in the upper and lower canines, using the following protocol, in an only monthly dose: Lower canine buccal and lingual and upper canine buccal-780 nm wavelength; 40mW power; an energy density of 10 J/cm ; 10 seconds per point; energy per point 0,4J, a total energy of 4J applying to the lower canine and 2J the buccal of the upper canines and upper canine palatally-70mW of power; an energy density of 35J/cm 2 ; 20 seconds per point; 1,4J energy per point, the total energy 7J and total 9J to the upper canine. The retraction lasted three months, a total of three laser applications. To measure the amount of movement of canines retracted, monthly clinical measurements were made with a digital caliper (Mitutoyo-Japan), after tooth extractions and before each laser application. To compare the speed of orthodontic tooth movement between the irradiated and non-irradiated sides at the three movement stages, repeated measures one-way analysis of variance was used, followed by the Tukey test. For evaluation of tissue integrity, initial and final periapical radiographs of retracted canines were obtained, to evaluate a possible alveolar crest resorption by assessment of the distance from the alveolar bone crest to the cementoenamel junction, as well as the level of root resorption by the Levander and Malmgreen index, which was evaluated only on retracted canines. The nonparametric Wilcoxon test was applied for that purpose. In all tests we adopted a significance level of 5%. The results showed no statistically significant difference between the amount of retraction of the irradiated canines compared to the nonirradiated ones, in all evaluated periods. Regarding the influence of LLL in the levels of root and bone resorption, no significant differences between groups were found. It was therefore concluded that LLL in the protocol used was not effective in the acceleration of tooth movement and did not cause damage to the supporting tissues of the tooth.
Introdução: A respiração bucal (RB) em crianças altera o crescimento, desenvolvimento normal da face, oclusão dos dentes em função do desequilíbrio que ela provoca nas relações entre os sistemas muscular, ósseo e dental. Objetivo: Objetivou-se avaliar a prevalência de alterações no sistema estomatognático em crianças respiradoras bucais da Clínica Escola de Odontologia do Centro Universitário de João Pessoa-PB. Metodologia: Realizou-se um estudo exploratório, descritivo e transversal, com abordagem quantitativa. A coleta de dados foi realizada por meio do preenchimento de um formulário elaborado pelos pesquisadores que foi utilizado para a transcrição das informações pertinentes aos prontuários da Clínica Infantil, no total de 400 prontuários. Os dados coletados foram tabulados e compilados nos programas Microsoft Excel e Microsoft Word, em seguida foram analisados com total confidencialidade. Foi realizada análise descritiva e analítica de acordo com as variáveis obtidas. Resultados: De acordo com o resultado obtido nesta pesquisa, 44% das crianças pesquisadas por meio dos prontuários foram declaradas respiradoras bucais, e apenas 15.25% das crianças não apresentaram nenhum tipo de alteração pesquisada; 40,44% apresentaram mordida aberta, 37% apresentaram mordida cruzada, 22,59% deglutição atípica e 11,86% palato profundo. Conclusão: Conclui-se que a maioria das crianças respiradoras bucais atendidas na clínica escola do UNIPÊ apresentam algum tipo de alteração no Sistema Estomatognático.
ObjectiveThis study compared lateral radiographs of the nasopharynx (LN) and lateral
cephalometric radiographs (LC) used to assess nasopharyngeal airway space in
children.Material and MethodsOne examiner measured the nasopharyngeal space of 15 oral breathing patients aged
between 5 and 11 years old by using LN and LC. Both assessments were made twice
with a 15-day interval in between. Intergroup comparison was performed with
t-tests (P < 0.05).ResultsComparison between LN and LC measurements showed no significant differences.ConclusionLateral cephalometric radiograph is an acceptable method used to assess
nasopharyngeal airway space.
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