Recently, several treatments for fighting malignant tumors have been designed. However these procedures have well
known inconveniences, depending on their applicability, tumor size and side effects, among others. Magnetic
hyperthermia is a safe, non-invasive method for cancer therapy. This treatment is applied via elevation of target tissue
temperature by dissipation of heat from Magnetic Nanoparticles (MNPs), previously located within the tumor. The
induction of heat causes cell death and therefore the removal of the tumor.
In this work the thermal diffusion in phantoms of agar loaded with magnetic nanoparticles (MNPs) is studied using the
infrared thermography technique, which is widely used in biology/medicine (e.g. skin temperature mapping). Agar is one
of the materials used to simulate different types of body tissues, these samples are known as “phantoms”. Agar is of
natural origin, low cost and high degree of biocompatibility. In this work the agar gel was embedded with MNPs by coprecipitation
and placed in an alternating magnetic field radiation. As a consequence, the energy from the radiation
source is dissipated as heat and then transferred from the MNP to the gel, increasing its temperature.
For the temperature analysis, the samples of agar gel were stimulated by RF magnetic field generated by coils. Heating
was measured with infrared thermography using a Thermovision A20M infrared camera. Thermographic images allowed
obtaining the dependence of thermal diffusion in the phantom as a function of the magnitude of the applied RF magnetic
field and the load of magnetic particles.
One of the most important subjects of interest in dentistry and teeth preservation is related to the effects of bleaching
agents on the integrity of the dental pieces. This is especially crucial when teeth surface has received some damage,
generated by chemical, biological and mechanical agents or weathering in the case of dental pieces recovered from
burial sites. In this work the time evolution of the effects of bleaching agents on the surface of dental pieces is monitored
using diffuse reflectance in the visible spectrum is reported. The effects were monitored in teeth previously subject to
chemical agents. Bleaching was induced using commercial whitening products. It is shown that the time evolution of the
reflectance depends strongly on the condition of the surface as well as on the thickness of enamel. Additionally the
colorimetric analysis of the samples during the bleaching is presented. This is especially useful in for comparing with
previous studies. In order to complement our studies, the effects of the bleaching on the surface of the teeth were
monitored by scanning electron microscopy.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.