Influence of fluoride-containing acidic artificial saliva on the mechanical properties of Nickel-Titanium orthodontics wires.
Article
Dans Anglais
| IMSEAR
| ID: sea-145788
ABSTRACT
Objective:
This study aimed to investigate the influence of fluoride and an acidic environment on the mechanical properties of NiTi orthodontic wires (NiTiW) in artificial saliva.Design:
A prospective laboratory investigation.Setting:
Department of Stomatology, First Affiliated Hospital, Zhejiang University, Hangzhou, China. Materials andMethods:
Commercial, round 0.016-inch NiTiW were immersed in 0% or 0.05% Natrium-Fluoride-containing artificial saliva at a pH of 4 or 6 for one or three days, respectively. NiTiW were examined with a three-point bending test, Vickers' microhardness tests and surface morphology observation (SEM).Results:
A pH of 4 increased microhardness and decreased the three-point bending strength significantly (P≤0.05), whereas immersion time and fluoride concentration had no significant influence on the microhardness or on the three-point bending strength (P>0.05). When examining the test group NiTiWs after three days of immersion at a pH of 4 the SEM revealed a rough surface morphology, a damaged oxide layer and signs of corrosion.Conclusions:
The most influential factor for decreasing the unloading force and increasing the hardness seems to be the pH value, whereas immersion time and NaF addition do not have a major influence.
Texte intégral:
Disponible
Indice:
IMSEAR (Asie du Sud-Est)
Sujet Principal:
Fils orthodontiques
/
Salive artificielle
/
Titane
/
Test de matériaux
/
Flexibilité
/
Corrosion
/
Analyse du stress dentaire
/
Fluorures
/
Dureté
langue:
Anglais
Année:
2012
Type:
Article
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