AVALIAÇÃO IN VITRO DA LIBERAÇÃO DE ÍONS E DAS ALTERAÇÕES DE SUPERFÍCIE DE MINI-IMPLANTES ORTODÔNTICOS / AVALIAÇÃO IN VITRO DA LIBERAÇÃO DE ÍONS E DAS ALTERAÇÕES DE SUPERFÍCIE DE MINI-IMPLANTES ORTODÔNTICOS

AUTOR(ES)
DATA DE PUBLICAÇÃO

2007

RESUMO

Mini-implants are successfully used as anchorage devices in orthodontics. The miniimplants alloys are subject to corrosion process in the oral environment. The metallic ions release may lead to adverse physiological effects, including citotoxicity,genotoxicity, carcinogenesis and allergic reactions. The aim of this study was to evaluate the ions release and surfaces characteristics of the mini-implants of two Brazilian commercial brands, SIN and Neodent. Therefore, the mini-implants were immersed in artificial saliva (pH 6,76) and incubated for 60 and 120 days. The resulting extracts were submitted to instrumental neutrons activation analyses (INAA) to determine and to quantify the present ions in the extracts. The corrosion products were analyzed by the energy dispersive spectroscopy (EDS) and the surfaces characteristics of the mini-implants were examined in a scanning electron microscopy (SEM), before and after immersion in artificial saliva. In the SINs mini-implants the following ions were detected: silver (0,01 to 0,02 g/mL), chromium (0,01 g/mL),iron (0,82 to 1,24 g/mL), nickel (0,5 to 0,83 g/mL), titanium (32 to 43 g/mL) and vanadium (0,002 to 0,01 g/mL). In the Neodents mini-implants were detected: silver (0,01 g/mL), chromium (0,01 g/mL), iron (0,72 to 1,08 g/mL), nickel (0,48 to 0,70 g/mL), titanium (30 to 43 g/mL) and vanadium (0,003 to 0,006 g/mL). The EDS analyses on SINs mini-implants showed titanium (91.29%) and aluminum (8.71%) peaks for the control group, titanium (90.48%), aluminum (5.76%) and vanadium (3.76%) peaks for the group witch was immersed during 60 days in artificial saliva and titanium (89.57%), aluminum (6.0%) and vanadium (4.43%) peaks for the group immersed during 120 days. The EDS analyses on Neodents mini-implants showed titanium (88.84%), aluminum (5.86%), vanadium (4.53%) and iron (0.77%) peaks for the control group, titanium (90.77%), aluminum (4.91%), vanadium (3.6%) and sodium (0.72%) peaks for the group immersed in artificial saliva during 60 days and titanium (90.47%), aluminum (6.88%) and vanadium (2.65%) peaks for the group witch was immersed during 120 days. The surface properties examined through SEM showed roughness suggesting corrosion areas on both, SIN and Neodents miniimplants,analyzed after 120 days of immersion in artificial saliva. The evaluated miniimplants demonstrated good biocompatibility and seemed to be safe to be used in vivo.

ASSUNTO(S)

dental implants dental etching ortodontia implantes dentÁrios corrosÃo dentÁria

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