trauma from occlusion: dental implants Flashcards
what are the key characteristics of natural teeth that relate to occlusal forces?
PDL Attachment Apparatus
Can “adapt” to heavy forces
Tooth mobility as a physiological/ pathological phenomena
how do dental implants differ in their response to occlusal forces? (in comparison to natural teeth)
Direct bone-implant surface mechanical binding (osseointegration)
Continuous bone remodeling at bone-implant surface interface
Implant mobility as a pathological phenomena
implants are attached to the bone by ____________
Osseointegration
what is primary stability of an implant?
stability of the implant at the time of placement (mechanical interlocking mechanism between a screw and bone surface)
what factors influence primary stability of implants?
- Bone density
- Implant fixture design
how long is the healing time for mandibular implants? maxillary implants?
Mandible- 3 months
Maxilla- 6 months
what are the 3 types of implant loading?
Immediate Loading (at the time of placement)
Early loading (before conventional healing time)
Late loading (following 3 or 6 months based on location)
what types of failures can occur in an implant with excessive occlusal force?
Porcelain Fracture
Implant to abutment (screw loosening or fracture)
Implant fixture fracture
T/F: implants that have excessive occlusal force will not effect the adjacent teeth
FALSE
they can increase mobility of adjacent teeth
why do implants not have the same proprioception as normal teeth?
Sensory feedback through receptors localized within pdl (viscoelasticity) and within bone (elasticity)
the PDL is what gives most proprioceptive feedback
what are the 3 types of forces placed on implants?
Static forces
Functional forces
Excessive forces
what type of implant is at a high risk for excessive forces?
cantilevered implants
the Loading time of an implant depends on:
- Primary stability of the implant
- Implant design
- Restorative design
- Presence/absence of risk factors
T/F: Functional (and well controlled) loading may increase bone to implant contact
true
occlusal trauma can be a __________ etiological factor for peri-implant disease
primary
what causes “Retrograde Peri-implantitis”?
occlusal trauma
causes bone loss around implant
why must the forces on implants always follow the long axis?
implants lack a PDL so they are unable to “give” in response to any lateral forces
T/F: Research has shown that implant length is more critical than diameter in reducing the bone stress.
FALSE
Research has shown that implant diameter is more critical than length in reducing the bone stress.
the “all-on-4” implant placement technique is used for what?
full dentures
