ABSTRACT
The aim of this study was to analyze the mechanical behavior of different orthodontic retraction loops. Two designs of orthodontic loops for closing space were analyzed: teardrop-shaped (T) and circle-shaped loop (C), of two different heights (6 and 8 mm), and two types of orthodontic wires (stainless steel - 0.19' x 0.25'; TMA - titanium molybdenum alloy - 0.016' x 0.016'). The sample consisted of 80 loops, divided into 8 groups determined by the combination shape/height/type of wire, which were submitted to tensile testing at a speed of 2 mm/min., to measure the quantity of force generated when activated in the interval of 0.75 mm and 2.25 mm. The results were submitted to the ANOVA and Tukey statistical tests to compare the groups, and the Student's-t test to compare the means of two groups. Statistically higher values were observed for the size 6 mm, circle shape and stainless steel composition. The group "teardrop-8 mm-TMA" together with the group "circle-8 mm-TMA" presented the lowest mean value, differing statistically from all of the other groups. It was concluded that the alloy of the wire and the height of the loop would be more important than the loop design.
Subject(s)
Dental Alloys/chemistry , Orthodontic Appliance Design , Orthodontic Wires , Alloys/chemistry , Humans , Materials Testing , Stainless Steel/chemistry , Stress, Mechanical , Surface Properties , Tensile StrengthSubject(s)
Orthodontic Appliance Design , Orthodontic Retainers , Acrylic Resins , Humans , Orthodontic Wires , Surface PropertiesABSTRACT
O presente estudo avaliou o tipo de escova dental, manual ou elétrica, que se mostra mais eficaz na remoçäo da placa bacteriana em pacientes portadores de aparelho ortodôntico fixo. As escovas avaliadas foram cross action (oral B) e braun oral-b ultra plaque remover. Quinze pacientes em fase de dentadura permanente, portadores de aparelhagem ortodôntica fixa, foram selecionados e submetidos a exame clínico, orientaçäo de higiene bucal, profilaxia dental e revelaçäo de placa para determinaçäo do índice de placa visível. Os resultados mostraram superioridade da escova manual sobre a elétrica na remoçäo da placa bacteriana em todas as regiöes analisadas nas faces vestibulares dos dentes que contiham bráquetes
