Dental Implants Osseointegration & Healing

Question 1

Osseointegration was first scientifically described by which researcher?

Accepted Answer

Per-Ingvar Brånemark

Answer

Professor Per-Ingvar Brånemark discovered osseointegration in the 1950s when titanium chambers could not be removed from rabbit bone, leading to modern implant dentistry.

Question 2

Osseointegration is best defined as:

Accepted Answer

Direct structural and functional connection between living bone and the implant surface without intervening connective tissue

Answer

True osseointegration requires direct bone-to-implant contact at the light microscope level without any fibrous tissue at the interface.

Question 3

The healing time for osseointegration in dense cortical bone (Type I) compared to softer bone (Type IV) is typically:

Accepted Answer

Longer in Type I due to reduced vascularity

Answer

Dense cortical bone (Type I) has lower vascularity and blood supply, requiring longer healing time (up to 6 months) compared to more vascular cancellous bone.

Question 4

Which cell type is primarily responsible for new bone apposition on the implant surface during osseointegration?

Accepted Answer

Osteoblasts

Answer

Osteoblasts are bone-forming cells that migrate to the implant surface and deposit osteoid matrix that eventually mineralizes into bone.

Question 5

Micro-movement threshold that compromises osseointegration is generally accepted to be:

Accepted Answer

Less than 150 microns

Answer

Micro-movements exceeding 150 microns at the implant-bone interface disrupt healing and promote fibrous tissue encapsulation instead of osseointegration.

Dental Implants Practice Test

Dental Implants Practice Test

Dental Implants Osseointegration & Healing