Frequently Asked Questions

Q: What is the recommended perforation of the cortical layer of the augmentation site prior to fixation of Straumann® AlloGraft Custom Block?

A: To date, an improvement in osteogenesis due to perforation of the cortical layer of the recipient site has not been proven. However, perforation induces translocation of blood and subsequently cells and growth factors into the augmentation site, which might accelerate healing.

Q: Can a patient experience an inflammatory reaction (swelling, redness) after treatment with Straumann AlloGraft Custom Block? Why?

A: There are no documented cases of disease transmission, mutagenicity or rejection of a graft with this kind of processing. In our experience most problems appear as a result from insufficient soft-tissue mobilization, lack of primary wound closure, or allergic reactions against antibiotics. Problems can also be caused by contact of the block with saliva prior to implantation. Customer complaints will be registered. The complaint must include the LOT number of the applied material(s), a description of the case and the problems occurred.

Q: What happens with Straumann® AlloGraft Custom Block after implantation?

A: Due to the natural bone surface structure and natural collagen content, bone stimulation and formation starts early. The bone stimulation and formation is supported by growth factors binding to the surface. Straumann AlloGraft Custom Block is highly porous and therefore stimulates rapid vascularization and formation of new bone. Since the natural structure of the mineralized collagen is preserved during the production process, physiologic remodeling of the allogenic bone graft, due to the balance of resorption and synthesis, leads to a subsequent replacement of the graft material by patients’ own vital bone, providing optimal conditions for long-lasting, stable implant integration. 

Q: How long does the Straumann® AlloGraft Block take to integrate?

A: The healing time is approximately 6 months. This is dependent on the defect size and individual patient. The material is 100% absorbable and remodels into the patient’s own bone in approximately one to two years.

Q: Should Straumann® AlloGraft Custom Block be rehydrated?

A: Straumann AlloGraft Custom Block does not need to be rehydrated. Excessive rehydration prior to transplantation may compromise the physical properties of the block and should therefore be avoided. Exposure to liquids before fixation should be kept to a minimum for ease of handling. Straumann AlloGraft Custom Block is hydrophilic, immediately absorbing blood, which accelerates osteogenesis when placed at the recipient site.

Q: How should Straumann® AlloGraft Custom Block be fixated to the jaw?

A: Straumann AlloGraft Custom Block is screwed into the recipient site with Straumann® Bone Block Fixation screws. Application of excessive force might cause damage to the block graft.

Q: Which screws should be used?                                                                     

A: The AlloGraft Custom Block should be fixed with osteosynthesis screws. Please use Straumann block fixation screws to prevent from voiding your warranty. No self-tapping screws should be used, because the risk of breaking the block is too high.                                              

Q: What’s the lead time?

A: 8-10 weeks after placing the order the AlloGraft Custom Block will be shipped.

Q: Why is the lead time longer than other Straumann products?

A: Straumann® AlloGraft Custom Block is an individual product designed according to the patients’ defect. The customization combined with sterilization and quality checks result in extended lead times. The Straumann® AlloGraft Custom Block planning and ordering process is extensively organized to meet all schedules without affecting the high quality standards of the product.

Q:  What is the benefit of the Straumann® AlloGraft Custom Block?

A: Straumann® AlloGraft Custom Block is easy to apply, because it is custom designed for each individual patient. It reduces surgical treatment time, eliminates the need to harvest autologous bone and reduces patient’s morbidity and discomfort.

Q: What are the key success factors in block grafting?

A: Proper soft-tissue mobilization and tension-free wound closure are essential to avoid wound dehiscence. The surgeon needs to overlap soft tissue flaps before suturing. Covering the defect with a collagen membrane is essential for the success of a graft and serves as a resorption protection. (Suggested use of Straumann Membrane FlexTM).

Q: What is the origin of Straumann® AlloGraft Custom Block?

A: Straumann® AlloGraft Custom Block is 100% human donor bone. It is produced at the LifeNet Health® aiming to provide allogenic transplants for orthopedic and dental regeneration. LifeNet Health is a worldwide leading tissue bank.

Q: What is the maximum size of the Custom Block?                           

A: The maximum size is 23x13x13mm.                                                                 

Q: How much resorption is anticipated within 6 months after augmentation?       

A: The average volume loss is 5-10% (approximately. 0.5 mm).*

* Nissan, J., Ghelfan, O., Mardinger, O., Calderon, S., & Chaushu, G. (2011). Efficacy of cancellous block allograft augmentation prior to implant placement in the posterior atrophic mandible. Clinical Implant Dentistry and Related Research, 13(4), 279–85.

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