Dental Implants Bone Grafting & Ridge Augmentation 3

Question 1

What is the 'tent pole' effect in Guided Bone Regeneration (GBR)?

Accepted Answer

Creating and maintaining space under a membrane using rigid supports such as pins or titanium mesh

Answer

The tent pole effect refers to the technique of using titanium screws, pins, or mesh to mechanically support and maintain the volume of space beneath a GBR membrane, preventing membrane collapse into the defect and ensuring adequate room for bone regeneration.

Question 2

How is distraction osteogenesis applied in ridge augmentation for dental implants?

Accepted Answer

Surgically dividing bone and gradually separating the segments to stimulate new bone formation in the gap

Answer

Distraction osteogenesis involves a corticotomy to divide bone, followed by a latency period and then gradual mechanical separation (distraction) of the segments, stimulating new bone (callus) formation in the expanding gap for vertical or horizontal ridge augmentation.

Question 3

What is the standard activation rate used for bone distractors in vertical ridge augmentation procedures?

Accepted Answer

1 mm per day

Answer

The standard distraction rate is approximately 1 mm per day (typically in two 0.5 mm activations per day), which matches the rate of natural bone callus formation; faster rates result in fibrous tissue rather than bone, while slower rates cause premature consolidation.

Question 4

What term describes bone graft material that is derived from human cadaveric donors and processed for clinical use?

Accepted Answer

Allograft

Answer

Allograft refers to bone graft material obtained from human donors, which undergoes processing (freeze-drying, demineralization, sterilization) to eliminate immunogenicity while preserving its scaffolding and osteoinductive properties.

Question 5

Which type of bone defect is most favorable for successful bone regeneration using GBR techniques?

Accepted Answer

Contained intrabony defects with multiple remaining bony walls

Answer

Contained intrabony defects with multiple remaining bony walls (three-wall or four-wall defects) are most favorable because the surrounding bone provides blood supply, osteogenic cells, and natural containment for regenerating bone, reducing the need for space maintenance.

Dental Implants Practice Test

Dental Implants Practice Test

Dental Implants Bone Grafting & Ridge Augmentation 3