RT Journal Article
T1 Hydroxyapatite scaffolds derived from deer antler: Structure dependence on processing temperature
A1 González Rodríguez, Luis Mario
A1 López Álvarez, Miriam
A1 Astray, S
A1 Solla Agra, Eugenio Luis
A1 Serra Rodríguez, Julia Asunción
A1 González Fernández, Pío Manuel
K1 3314.02 Prótesis
K1 3312 Tecnología de Materiales
K1 3314.01 Órganos Artificiales
AB Discarded antlers from deer are proposed as a promising alternative CaP-based bone graft to fulfil specific unsolved clinical requirements, such as osteoinductive properties or an optimal balance in stability/resorbability. Moreover, depending on the location of the bone defect and the type of bone lost (cortical versus cancellous), adequate morphological/mechanical properties for indicated biomaterials are needed. At the present work a detailed study of the physicochemical properties of two bioceramics obtained from the cortical and the trabecular sections of deer antler is presented. The influence of temperature on both bioceramics was also evaluated in depth to guarantee removal of organic material, analyze the compositional changes for high temperatures (up to 1100 °C) and study how their specific morphological features can influence these modifications. Morphological evaluation (SEM, porosity) of both final bioapatites (cortical and trabecular) was assessed, together with composition (ICP-OES, EDS, FT-Raman, XRD, TEM) and mechanical properties (nano-indentation). Optimal temperature for calcination was selected, through a thermogravimetric analysis, to ensure: the removal of organic material and a re-crystallization process (carbonate group decomposition) in both sections. Main contribution of hydroxyapatite (Ca5(PO4)3(OH)) in hexagonal phase was found, structure similar to human bone, with the presence of periclase (MgO). A Ca/P ratio in the same range as porcine and bovine bones, and with trace elements, such as Mg and Na, that play relevant roles in osteogenic metabolism was also detected. The dense and compact structure in cortical section and the spongy-like structure in the trabecular one, with pores >200 μm in diameter occupying a surface of 52 ± 8% were characterized. Related to these morphological properties, the same calcination temperature was proven to yield larger crystals in the trabecular section, given the higher availability of space for the crystal to grow (lower density of material).
PB Materials Characterization
SN 10445803
YR 2019
FD 2019-09
LK http://hdl.handle.net/11093/6226
UL http://hdl.handle.net/11093/6226
LA eng
NO Materials Characterization, 155, 109805 (2019)
NO Xunta de Galicia | Ref. ED431C 2017_51
DS Investigo
RD 21-abr-2025