Comparison of two β-tricalcium phosphate composite grafts used for reconstruction of mandibular critical size bone defects

2009 ◽  
Author(s):  
M. C. Nolff ◽  
N.-C. Gellrich ◽  
G. Hauschild ◽  
M. Fehr ◽  
K.-H. Bormann ◽  
...  
Keyword(s):  
Tricalcium Phosphate ◽  
Critical Size ◽  
Bone Defects ◽  
Composite Grafts

scholarly journals Additive Manufacturing of β-Tricalcium Phosphate Components via Fused Deposition of Ceramics (FDC)

Materials ◽  
2020 ◽  
Vol 14 (1) ◽  
pp. 156
Author(s):  
Steffen Esslinger ◽  
Axel Grebhardt ◽  
Jonas Jaeger ◽  
Frank Kern ◽  
Andreas Killinger ◽  
...  
Keyword(s):  
Tricalcium Phosphate ◽  
Critical Size ◽  
Bone Defects ◽  
Healthcare Systems ◽  
The Body ◽  
Patient Specific ◽  
Poly Lactic Acid ◽  
Fused Deposition ◽  
Poly Ethylene ◽  
Fused Deposition Of Ceramics

Bone defects introduced by accidents or diseases are very painful for the patient and their treatment leads to high expenses for the healthcare systems. When a bone defect reaches a critical size, the body is not able to restore this defect by itself. In this case a bone graft is required, either an autologous one taken from the patient or an artificial one made of a bioceramic material such as calcium phosphate. In this study β-tricalcium phosphate (β-TCP) was dispersed in a polymer matrix containing poly(lactic acid) (PLA) and poly(ethylene glycole) (PEG). These compounds were extruded to filaments, which were used for 3D printing of cylindrical scaffolds via Fused Deposition of Ceramics (FDC) technique. After shaping, the printed parts were debindered and sintered. The components combined macro- and micropores with a pore size of 1 mm and 0.01 mm, respectively, which are considered beneficial for bone healing. The compressive strength of sintered cylindrical scaffolds exceeded 72 MPa at an open porosity of 35%. The FDC approach seems promising for manufacturing patient specific bioceramic bone grafts.

scholarly journals The preparation and application of calcium phosphate biomedical composites in filling of weight-bearing bone defects

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Lijia Cheng ◽  
Tianchang Lin ◽  
Ahmad Taha Khalaf ◽  
Yamei Zhang ◽  
Hongyan He ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Calcium Phosphate ◽  
Tricalcium Phosphate ◽  
Weight Bearing ◽  
Bone Defects ◽  
Type I ◽  
Artificial Bone ◽  
Thermosensitive Hydrogel ◽  
Bone Repairing ◽  
Histological Staining

AbstractNowadays, artificial bone materials have been widely applied in the filling of non-weight bearing bone defects, but scarcely ever in weight-bearing bone defects. This study aims to develop an artificial bone with excellent mechanical properties and good osteogenic capability. Firstly, the collagen-thermosensitive hydrogel-calcium phosphate (CTC) composites were prepared as follows: dissolving thermosensitive hydrogel at 4 °C, then mixing with type I collagen as well as tricalcium phosphate (CaP) powder, and moulding the composites at 37 °C. Next, the CTC composites were subjected to evaluate for their chemical composition, micro morphology, pore size, Shore durometer, porosity and water absorption ability. Following this, the CTC composites were implanted into the muscle of mice while the 70% hydroxyapatite/30% β-tricalcium phosphate (HA/TCP) biomaterials were set as the control group; 8 weeks later, the osteoinductive abilities of biomaterials were detected by histological staining. Finally, the CTC and HA/TCP biomaterials were used to fill the large segments of tibia defects in mice. The bone repairing and load-bearing abilities of materials were evaluated by histological staining, X-ray and micro-CT at week 8. Both the CTC and HA/TCP biomaterials could induce ectopic bone formation in mice; however, the CTC composites tended to produce larger areas of bone and bone marrow tissues than HA/TCP. Simultaneously, bone-repairing experiments showed that HA/TCP biomaterials were easily crushed or pushed out by new bone growth as the material has a poor hardness. In comparison, the CTC composites could be replaced gradually by newly formed bone and repair larger segments of bone defects. The CTC composites trialled in this study have better mechanical properties, osteoinductivity and weight-bearing capacity than HA/TCP. The CTC composites provide an experimental foundation for the synthesis of artificial bone and a new option for orthopedic patients.

scholarly journals Role of Autologous Platelet Gel (APG) in Bone Healing: A Rabbit Study

2021 ◽  
Vol 11 (1) ◽  
pp. 395
Author(s):  
Antonio Scarano ◽  
Francesco Inchingolo ◽  
Biagio Rapone ◽  
Alberta Greco Lucchina ◽  
Erda Qorri ◽  
...  
Keyword(s):  
Critical Size ◽  
Bone Defects ◽  
New Bone Formation ◽  
Platelet Gel ◽  
Woven Bone ◽  
Rapid Healing ◽  
Rabbit Bone ◽  
Autologous Platelet ◽  
New Zealand Rabbits

Purpose: The aim of the present study is to evaluate the influence and efficacy of autologous platelets on bone regeneration in a rabbit defects model. Materials and Methods: A total of 12 critical size tibial defects were produced in six New Zealand rabbits: A total of six defects were filled with autologous platelet gel (APG) and six defects were maintained as untreated controls. No membranes were used to cover the bone osteotomies. The histology and histomorphometry were performed at four weeks on retrieved samples of both groups. Results: No complications were reported in any of the animals nor for the defects produced. A significantly higher lamellar and woven bone percentage was reported for the APG group with a lower level of marrow spaces (p < 0.05). Evidence of newly formed bone was found in the superficial portion of the bone defect of APG samples where no aspects of bone resorption were observed. Conclusions: The evidence of the present research revealed that APG increases new bone formation restricted to the cortical portion and induces more rapid healing in rabbit bone defects than in untreated defects.

scholarly journals Personalized medicine for reconstruction of critical-size bone defects – a translational approach with customizable vascularized bone tissue

2021 ◽  
Vol 6 (1) ◽  
Author(s):  
Annika Kengelbach-Weigand ◽  
Carolina Thielen ◽  
Tobias Bäuerle ◽  
Rebekka Götzl ◽  
Thomas Gerber ◽  
...  
Keyword(s):  
Personalized Medicine ◽  
Large Scale ◽  
Critical Size ◽  
Therapeutic Option ◽  
Living Organism ◽  
Bone Defects ◽  
Sheep Model ◽  
Simple Alternative ◽  
Translational Approach ◽  
Near Future

AbstractTissue engineering principles allow the generation of functional tissues for biomedical applications. Reconstruction of large-scale bone defects with tissue-engineered bone has still not entered the clinical routine. In the present study, a bone substitute in combination with mesenchymal stem cells (MSC) and endothelial progenitor cells (EPC) with or without growth factors BMP-2 and VEGF-A was prevascularized by an arteriovenous (AV) loop and transplanted into a critical-size tibia defect in the sheep model. With 3D imaging and immunohistochemistry, we could show that this approach is a feasible and simple alternative to the current clinical therapeutic option. This study serves as proof of concept for using large-scale transplantable, vascularized, and customizable bone, generated in a living organism for the reconstruction of load-bearing bone defects, individually tailored to the patient’s needs. With this approach in personalized medicine for the reconstruction of critical-size bone defects, regeneration of parts of the human body will become possible in the near future.

scholarly journals Regenerating Critical Size Rat Segmental Bone Defects with a Self‐Healing Hybrid Nanocomposite Hydrogel: Effect of Bone Condition and BMP‐2 Incorporation

2021 ◽  
pp. 2100088
Author(s):  
Claire I. A. Houdt ◽  
Marianne K. E. Koolen ◽  
Paula M. Lopez‐Perez ◽  
Dietmar J. O. Ulrich ◽  
John A. Jansen ◽  
...  
Keyword(s):  
Critical Size ◽  
Bone Defects ◽  
Self Healing ◽  
Nanocomposite Hydrogel ◽  
Hybrid Nanocomposite ◽  
Segmental Bone ◽  
Bone Condition ◽  
Segmental Bone Defects

Bone formation and bioresorption after implantation of injectable ?-tricalcium phosphate granules-hyaluronate complex in rabbit bone defects

2004 ◽  
Vol 70A (4) ◽  
pp. 542-549 ◽  
Author(s):  
Masaaki Chazono ◽  
Takaaki Tanaka ◽  
Hirokazu Komaki ◽  
Katsuyuki Fujii
Keyword(s):  
Bone Formation ◽  
Tricalcium Phosphate ◽  
Bone Defects ◽  
Rabbit Bone
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