Final published version
Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
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TY - JOUR
T1 - Preparation and characterization of bioactive composites and fibers for dental applications
AU - Qidwai, M.
AU - Sheraz, M.A.
AU - Ahmed, S.
AU - Alkhuraif, A.A.
AU - Ur Rehman, I.
PY - 2014
Y1 - 2014
N2 - Objectives. The present study was carried out to create composites and fibers using polyurethane (PU) with hydroxyapatite (HA) that could be used for dental applications. Methods. Composites with varying HA concentration were prepared by solution casting technique. Similarly, PU-HA fibers with varying PU hard and soft segments and fixed HA concentration were also prepared. Various characterization techniques, such as, X-ray diffractometry, differential scanning calorimetry, scanning electron microscopy and Fourier transform infrared spectroscopy in conjunction with photo-acoustic sampling cell were employed to study the composites and fibers for changes in their physicochemical propertiesbefore and after immersion in artificial saliva at 37°C for up to 5 days. Results. The results indicated formation of amorphous apatite layers with maximum amorphicity in composites containing highest amount of HA with 5 days of immersion in artificial saliva. Similarly, fibers with more PU hard segment resulted in better transformation of crystalline HA to its amorphous state with increasing immersion time thus confirming the bioactive nature of the HA-PU fibers. Significance. Concentrations of HA and PU hard segment along with the duration of immersion in artificial saliva are two major factors involved in the modification of solid-state properties of HA. The amorphous apatite layer on the surface is known to have tendency to bind with living tissues and hence the use of optimum amount of HA and PU hard segment in composites and fibers, respectively could help in the development of novel dental filling material. © 2014 Academy of Dental Materials.
AB - Objectives. The present study was carried out to create composites and fibers using polyurethane (PU) with hydroxyapatite (HA) that could be used for dental applications. Methods. Composites with varying HA concentration were prepared by solution casting technique. Similarly, PU-HA fibers with varying PU hard and soft segments and fixed HA concentration were also prepared. Various characterization techniques, such as, X-ray diffractometry, differential scanning calorimetry, scanning electron microscopy and Fourier transform infrared spectroscopy in conjunction with photo-acoustic sampling cell were employed to study the composites and fibers for changes in their physicochemical propertiesbefore and after immersion in artificial saliva at 37°C for up to 5 days. Results. The results indicated formation of amorphous apatite layers with maximum amorphicity in composites containing highest amount of HA with 5 days of immersion in artificial saliva. Similarly, fibers with more PU hard segment resulted in better transformation of crystalline HA to its amorphous state with increasing immersion time thus confirming the bioactive nature of the HA-PU fibers. Significance. Concentrations of HA and PU hard segment along with the duration of immersion in artificial saliva are two major factors involved in the modification of solid-state properties of HA. The amorphous apatite layer on the surface is known to have tendency to bind with living tissues and hence the use of optimum amount of HA and PU hard segment in composites and fibers, respectively could help in the development of novel dental filling material. © 2014 Academy of Dental Materials.
KW - Apatite surface layers
KW - Artificial saliva
KW - Composites and fibers
KW - Crystallinity
KW - Hydroxyapatite
KW - Polyurethane
KW - Acoustic spectroscopy
KW - Apatite
KW - Body fluids
KW - Dental prostheses
KW - Differential scanning calorimetry
KW - Fibers
KW - Filling
KW - Fourier transform infrared spectroscopy
KW - Phosphate minerals
KW - Polyurethanes
KW - Scanning electron microscopy
KW - X ray diffraction analysis
KW - Bioactive composites
KW - Characterization techniques
KW - Crystallinities
KW - Dental filling materials
KW - Solid-state properties
KW - Solution-casting technique
KW - Surface layers
KW - Dental composites
KW - dental material
KW - differential scanning calorimetry
KW - infrared spectroscopy
KW - scanning electron microscopy
KW - X ray diffraction
KW - Calorimetry, Differential Scanning
KW - Dental Materials
KW - Microscopy, Electron, Scanning
KW - Spectroscopy, Fourier Transform Infrared
KW - X-Ray Diffraction
U2 - 10.1016/j.dental.2014.05.022
DO - 10.1016/j.dental.2014.05.022
M3 - Journal article
VL - 30
SP - e253-e263
JO - Dental Materials
JF - Dental Materials
SN - 0109-5641
IS - 10
ER -