paper - causes of early ..

Question 1

initial breakdown occurs?

reasonable loss?

Answer 1

begins at crestal region - even in succesfullly osseointegrated ones

first year = less than equal to .2mm - then annually thereafter?

Question 2

saucerization

Answer 2

observed radiographically - after first year of function (prosthesis loading) - crestal bone loss to or beyond the first thread of titanium screw implants

Question 3

top 6 reasons looke at for crestal loss

Answer 3

surgical trauma 
occlusal overload 
peri-implantitis
presence of microgap
formation of biologic width 
implant crest module

Question 4

surgical trauma?

Answer 4

when implant surrounded by fibrous connective tissue or have apical extension of junctinal epi

temperature - overheated = risk of failure increased

periosteal elevation
- cancellous bone better than cortical

saucerization loss

if successful - not observed at stage 2

Question 5

occlusal overload

Answer 5

bending overload = marginal bone loss / deossintegration

can have loss of crestal bone with overload - peri-implantitis can occur with severe overload and co-existance of inflammtion

Question 6

cortical bone least resistant to

Answer 6

shear force - whic is increased by bending overload

Question 7

stress reduction by

Answer 7

increasing surface area and decreasing forces

b/c stress is force divided by area

Question 8

decrease microfracture by

Answer 8

axially directed occlusion as well as progressiveloading

Question 9

implant failure in later stages?

Answer 9

peri-implantitis and overloading forces

Question 10

flora associated with implantitis

Answer 10

similar to perio
bacteroides, fusobacteriu and spirochetes

site specific

history of perio in patient plays a role

Question 11

faster destruction around implans because?

Answer 11

collagen fiber direction is parallel to implant surface vs perpendicular in tooth surfaces and more vascular structures around teeth

Question 12

microgap in 1 stage?

Answer 12

this is non submerged — implant itsel exends above the alveolar crest level - therefor such a microgap does NOT exist at the level of the bone

Question 13

microgap

Answer 13

between implant and abutment at or below the alveolar crest

Question 14

countersinking places the microgap where

Answer 14

below crest of bone

Question 15

Quirynen and van Steenberghe51 and Persson et
al.52 found microbial species cultivated from internal
surfaces of submerged implants or their restorative
component parts?

Answer 15

The study implied that a microbial leakage from the microgap between the
abutment/fixture interface in submerged implants is
the most probable origin for this contamination. However, the possibility of microbial contamination through
microgap between the abutment and fixture in submerged implants is related to development of periimplantitis, and its consequence is not limited to the
first year after loading.

Question 16

crestal bone

levels appeared dependent on the location of the

Answer 16

the

microgap, approximately 2 mm below the microgap.

Question 17

study by radiographically in dogs by Hermann et al.

and its importance / finding and meaning?

Answer 17

This study first demonstrated that the microgap between implant/abutment has a direct effect on
crestal bone loss independent of surgery approaches,
submerged or non-submerged

Question 18

although microgap may not be considered as the only cause of early implant bone loss, it
might cause …?

Answer 18

implant crestal bone loss during the healing phase if it is placed AT OR BELOW THE BONY CREST

Question 19

FORMATION of the bio width?

Answer 19

inevitably
occurs following biomechanisms regardless of implant
type

Question 20

main contributing factors to early implant bone loss

Answer 20

reformation of biologic width,
occlusal overload, microgap and implant crest module are the most likely contributing causes for the
early implant bone loss phenomenon.

However, early
implant bone loss may also result from or depend on
surgical trauma, peri-implantitis, and others.