Implants in Health

Question 1

osseointegration

Answer 1

direct attachment or connection of vital osseous tissue to the surface of an implant, without intervening CT (histo finding, need to look under scope)

Question 2

bone to implant contact between 1-18 yrs

Answer 2

approx 60 %

Question 3

how to increase osseointegration

Answer 3

1. implant surface characteristics- rough

2. surgical manupulation of alv bone - location, technique, condensation

Question 4

imp background factors for a reliable osseointegration

Answer 4

• biocampatibility (titanium alloy)
• design
• implant surface conditions
• status of host bed
• insertion technique
• loading conditions

Question 5

conventional loading conditions

Answer 5

max 6 mos, mand 3 mos

Question 6

initial implant stability is ________

Answer 6

mechanical (lateral displacement of bone tissue and tight contact at the cortical bone level)

Question 7

bone healing at 24 hrs

Answer 7

resorption at cortical bone. woven bone forms in spongy bone. blood clot formation. prolif of vasc structures into newly forming granulation tissue.

Question 8

bone healing at 1 week

Answer 8

reparative macro and undiff mesenchymal cells. modeling at the apical trabecular region and at furcation sites of screw shaped implant.

Question 9

bone healing at 2 weeks

Answer 9

new bone formation can be detected at “furcation sites” of implant surface

Question 10

bone healing at 6 weeks

Answer 10

callus formation and lamellar compaction w/in woven bone. some stability lost, will then come back

Question 11

jumping distance

Answer 11

distance that can be filled by new bone between the implant and the remaining host bone

ideal distance = 20-40 um

Question 12

minimum of alv bone that should surround implant?

Answer 12

1 mm

Question 13

minimum bone thickness between 2 implants

Answer 13

3 mm

Question 14

minimum bone thickness between implant and tooth

Answer 14

2 mm

Question 15

coronal part of implant should be placed approx ___ mm apical to adjacent CEJ

Answer 15

5

Question 16

implants can be placed with a max of ___ angle

Answer 16

20 degree

Question 17

2 parts of transmucosal attachment

Answer 17

1. barrier epi (2 mm long)
2. zone of CT (1-1.5 mm high)

collagen fiber bundles parallel to implant surface

Question 18

zone that is adjacent to implant surface is rich from ___ but poor from ___

Answer 18

fibroblasts, blood vessels

Question 19

zone that is in lateral direction and continuous with the first zone has fewer _____ but is rich in ____ and ____

Answer 19

fibroblasts, collagen fibers, blood vessels

Question 20

biological width and implants

Answer 20

BW exists around unloaded and loaded nonsubmerged one part titanium implants. it is approx 3 mm

Question 21

techniques to evaluate implants

Answer 21

1. periimplant probind
2. mobility
3. radiographic exam

Question 22

2 important issues related to peri implant health

Answer 22

1. KT really protects underlying bone

2. no long term difference in success rate for implants placed at grafted sites