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GUIDOR easy-graft is a moldable, sticky biomaterial that can be applied directly from the syringe. When in contact with blood, GUIDOR easy-graft hardens within minutes to form a porous scaffold that perfectly fits the defect morphology thus providing excellent clot stability in the initial healing period.

• Direct from the syringe
• Moldable mass assists tissue manipulation during application 
• In-situ hardening for clot stabilization
• No substances of animal or human origin
• Choice of resorption profiles

In their forward thinking article (Periodontology 2000, Oct 2003), Professors Hämmerle & Jung stated:

..."to simplify clinical handling, new materials should comprise a matrix with optimal cell ingrowth capacities and good mechanical properties, providing space for tissue regeneration. No membrane and no specific procedures for mechanical fixation should be necessary...

...the use of synthetic materials would result in lower surgical risks and lower morbidity in augmentation procedures and would represent an important step forward in simplifying bone regeneration techniques."

With GUIDOR easy-graft and its stunning handling and technical features such forward thinking considerations become reality.

The GUIDOR easy-graft difference

1: GUIDOR easy-graft system contains a pre-filled syringe of polymer coated granules (coloured blue in the illustration and labeled B in the scanning SEM image in the 'Granule Porosity' section below) together with a separate ampoule of polymer activator (BioLinker, as shown by dots in images 1).
2: When added to the syringe, BioLinker softens the polymer coating creating a sticky surface. GUIDOR easy-graft granules stick together when compressed and shaped.
3: When in contact with body fluids (highlighted in pink) BioLinker is flushed out of the material.
4: GUIDOR easy-graft hardens in a matter of minutes, forming a stable porous scaffold of interconnected granules matched to the defect shape (see also 'Macroporosity' SEM image below).


Granule Porosity

Osteoconductive bone grafts must stabilize the site, support a clot and provide space for new bone formation.

                                                                                                                                                                                       

    

Macroporosity

The stable scaffold created after application of GUIDOR easy-graft material stabilizes the site. The space between the adjoined granules supports a clot and allows space for development of subsequent new vessels.

                                                                                                                                                                                           

GUIDOR easy-graft: high porosity and open pore system

Microporous calcium phosphates with pore sizes 1 μm to 10 μm provide increased osteoconductivity and bone formation in comparison with materials without micropores. An open micropore system allows for optimal fluid circulation.

                                                                                                                                                                                             

Microporosity

The high microporosity of GUIDOR easy-graft is visible under the scanning electron microscope (A).

                                                                                                                                                                                               

The next generation of easy-graft*

From an original round granule, the CRYSTAL+ version of easy-graft presents now an irregular-shaped granule which allows more space for new bone formation. Being biphasic (60% HA + 40% β-TCP) and partially resorbable, the CRYSTAL+ version becomes integrated into the new bone formation and so derives greater benefit from the increased structural porosity of the + version. The CLASSIC version of easy-graft (100% β-TCP) remains with round granules as it resorbs in parallel to bone formation.

                                                                                                                                                                                             

BioLinker and PLGA resorption

The resorption process for BioLinker and PLGA polymer coating takes place in two stages:

Stage 1) BioLinker is extracted within hours

More than 90% of BioLinker is removed from the bone graft substitute within three hours (1) and excreted through the urine within 1–3 days (2). BioLinker contains NMP, a solvent widely used in pharmaceutical and medical devices such as dental membranes, subcutaneous drug-release systems etc.

                                                                                                                                                                                             
                                                                                                                                                                                                 

Stage 2) The PLGA polymer coating is resorbed over a few weeks

In parallel to the healing and regeneration process, the PLGA coating and adhesive connection between the granules gradually weakens (three to six weeks in vitro). The resorption process of PLGA is controlled by a hydrolytic cleavage of the polymer chains. Upon complete degradation, lactic acid and glycolic acid are formed. Both metabolites are innocuous, and they are excreted in the form of carbon dioxide and water.

 

References:

1. Habibovic P., Sees T. M., van den Doel M. A., van Blitterswijk C. A. and de Groot K.: Osteoinduction by biomaterials – physicochemical and structural influences J Biomed Mater Res A ( 2006 ) 77( 4 ): 747-62.

2. Hing K. A., Annaz B., Saeed S., Revell P. A. and Buckland T.: Microporosity enhances bioactivity of synthetic bone graft substitutes J Mater Sci Mater Med (2005) 16(5): 467-75