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p 3-7 Full Text SMART MATERIALS IN DENTAL RESTORATIVES T.P.
Narasimha Bharadwaj*, R. Sabari Kanchana and A. Parameswaran Teeth are constantly subjected to a multitude of diseases, among which dental caries is most common and significant. The carious process is governed by an array of factors, with its activity extending throughout the lifetime, resulting in loss of excessive ‘man hours’. Loss of tooth structure due to caries is replaced by various restorative materials. In the last two decades, esthetic materials have replaced metallic restoratives. In addition to being tooth colored, they should be able to encounter the progress of caries activity and aid in prevention. SMART materials were identified in dental restoratives to restore and prevent dental caries. This paper throws light on such SMART materials. p 8-12 Full Text SYNTHESIS
AND CHARACTERIZATION OF TITANIUM – CALCIUM PHOSPHATE COMPOSITES
FOR BIO APPLICATIONS
Powder
Metallurgy and Particulate Materials Laboratory Hydroxylapatite
(HA) has been widely used as a bone replacement material in
restorative dental and orthopaedic implants, due to its chemical and
crystallographic structure being similar to that of bone mineral. HA
being biocompatible is considered as the most promising bioactive
material for clinical use. However, its low mechanical strength
restricts from its use in biomedical applications.
Among all the surgical metals, titanium and its alloys are
the most popular ones as load bearing implants because of their
excellent biocompatibility and favourable mechanical properties. p 13-18 Full Text INVESTIGATIONS OF THE ANTIBACTERIAL PROPERTIES OF AN ANODIZED TITANIUM ALLOY Judy Gopal, P.
Muraleedharan, and P. George and H.S. Khatak Anodization of
titanium and its alloys produces a thin film of TiO2, which is
predominantly of anatase crystal structure. The anatase form of TiO2
is reported to exhibit phototcatalytic activity when exposed to
near-UV light (<380nm). In this study, the influence of
illumination by "black light blue" fluorescent lamps on
the adhesion of bacterial cells on acid-pickled as well as anodized
Ti6A14V specimens (anodized at 50V for 10mins) was carried out by
exposure in a 0.1% nutrient culture of Pseudomonas sp. Glancing
X-ray Diffraction studies of anodized surfaces showed peak at 2č value of 25.3 corresponding to anatase
type of TiO2. Significant reduction in bacterial attachment on the
anodized surfaces in the presence of illumination was observed. The
results of the present study suggest that the anodized titanium
alloy surface exposed to near - UV light exhibit strong
photocatalytic bactericidal effect. p 19-23 Full Text PREDICTING THE SUSCEPTIBILITY OF HNO3 TREATED 316 LVM ALLOY TO LOCALIZED ATTACK-AN ELECTROCHEMICAL APPROACH T.V. Thamaraiselvi, S.
Kannan, A. Balalmurugan and S. Rajeswari The synthetic origin biomaterials currently used for fabrication of orthopedic implants are broadly categorized as metals, ceramics and polymers and composites of these materials. Among metallic implants, Austenitic Stainless steel alloys are known for their superior mechanical features and resistant to corrosion. However during continuous loading in aggressive biological environment, they are susceptible to pitting and crevice corrosion. Hence surface modification is essential to prevent the failure of these implants under in- vivo conditions. From the available techniques nitric acid (HNO3) passivation was found to have profound effect on the corrosion resistance of stainless steels. The present study aimed at the nitric acid treatment effects on 316 LVM alloy through cyclic polarization in simulated body fluids. Further the efficiency of hydroxyapatite coating on acid treated stainless steels were evaluated. |
