Analise in vitro da resistencia ao cisalhamento de braquetes metalicos submetidos a reciclagem repetida : fixados com diferentes materiais

AUTOR(ES)
DATA DE PUBLICAÇÃO

2004

RESUMO

The aim of this research was to evaluate in vitro shear bond strength of metallic orthodontic brackets submitted to two consecutive recyclings with aluminium oxide air abrasion, making use of four different bond materials. The sample consisted of 40 bovine incisives. Forty metallic orthodontic edgewise brackets of central incisor Ultraminitrim (Dentaurum), were fixed in the bovine teeth with the following bonded material: Transbond XT, Concise, Smartbond and Fuji Orto, following the manufacturer s instructions. After bonding, they were stored in distilled water in incubators at 37ºC for 24 hours and submitted to 500 thermal cycles with 30 seconds in each bath (5ºC and 55ºC). The shear bond strength was determined with an Instron universal machine with 0,5mm/min speed. The removed brackets were recycled with aluminium oxide air abrasion (50 micrometer) and bonded again in the same bovine incisive, using the same bond material. After the second shear bond strength test the recycling procedures, the rebonding and shear bond strength test were repeated. The data were submitted to Analysis of Variance and Tukey s test (p=0.05), applied for each adhesive system in different treatments of metallic brackets. It was demonstrated that repeated recyclings, using the aluminium oxide air abrasion, don t interfere in the adhesive resistance, independent of the employed bond material. Among the used bond materials, Transbond XT presented the largest resistance values of shear bond strength, independent of the treatment of the bracket. Thus, we concluded that the recycling cumulative effects didn t affect the shear bond strength of metallic orthodontic brackets and that the effect bond material used for fixation of the bracket was not altered by the repeated recyclings

ASSUNTO(S)

oxido de aluminio aluminum oxide orthodontic brackets braquetes ortodonticos

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