Enhanced compatibility and initial stability of Ti6Al4V alloy orthodontic miniscrews subjected to anodization, cyclic precalcification, and heat treatment / 대한치과교정학회지
The Korean Journal of Orthodontics
; : 246-253, 2014.
Article
em En
| WPRIM
| ID: wpr-206382
Biblioteca responsável:
WPRO
ABSTRACT
OBJECTIVE: To evaluate the bioactivity, and the biomechanical and bone-regenerative properties of Ti6Al4V miniscrews subjected to anodization, cyclic precalcification, and heat treatment (APH treatment) and their potential clinical use. METHODS: The surfaces of Ti6Al4V alloys were modified by APH treatment. Bioactivity was assessed after immersion in simulated body fluid for 3 days. The hydrophilicity and the roughness of APH-treated surfaces were compared with those of untreated (UT) and anodized and heat-treated (AH) samples. For in vivo tests, 32 miniscrews (16 UT and 16 APH) were inserted into 16 Wistar rats, one UT and one APH-treated miniscrew in either tibia. The miniscrews were extracted after 3 and 6 weeks and their osseointegration (n = 8 for each time point and group) was investigated by surface and histological analyses and removal torque measurements. RESULTS: APH treatment formed a dense surface array of nanotubular TiO2 layer covered with a compact apatite-like film. APH-treated samples showed better bioactivity and biocompatibility compared with UT and AH samples. In vivo, APH-treated miniscrews showed higher removal torque and bone-to-implant contact than did UT miniscrews, after both 3 and 6 weeks (p < 0.05). Also, early deposition of densely mineralized bone around APH-treated miniscrews was observed, implying good bonding to the treated surface. CONCLUSIONS: APH treatment enhanced the bioactivity, and the biomechanical and bone regenerative properties of the Ti6Al4V alloy miniscrews. The enhanced initial stability afforded should be valuable in orthodontic applications.
Palavras-chave
Texto completo:
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Base de dados:
WPRIM
Assunto principal:
Tíbia
/
Líquidos Corporais
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Osseointegração
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Ratos Wistar
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Torque
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Ligas
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Interações Hidrofóbicas e Hidrofílicas
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Temperatura Alta
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Imersão
Idioma:
En
Revista:
The Korean Journal of Orthodontics
Ano de publicação:
2014
Tipo de documento:
Article