Timing of restoring an implant

Question 1

primary stability when do we get it? what happens to it

Answer 1

AT TIME OF IMPLANT PLACEMENT – then as it heals you lose some primary stability

general loss of the bone cells but they get replaced

Question 2

secondary stability in relation to primary

Answer 2

gives implant MORE stability than primary
- new bone cells come into the area after a certain period of time

bone GROWTH

Question 3

size of the hole you create for implant relative to size of implant? why?

Answer 3

slightly smaller –

WANT PRIMARY STABILITY AT TIME OF IMPLANT PLACEMENT

Question 4

size of the hole you create for implant relative to size of implant? why?

Answer 4

slightly smaller –

WANT PRIMARY STABILITY AT TIME OF IMPLANT PLACEMENT

Question 5

surface of implant treatment? implication?

Answer 5

more rapid bone growth with SLA active surface

so you get stability sooner

Question 6

how can you decrease time it takes to get secondary stability

Answer 6

treatment of the implant with roughened surface

like SLA active on it

2-3 weeks? or can wait 6 weeks

Question 7

how we used to test for osseointegration

Answer 7

tapping on it
if dull thud - theres space between impolant and bone but if got a harder loader noise and feel - no space

*not reliable

Question 8

test we use now for osseointegration

Answer 8

reverse torque test

Question 9

reverse torque test

Answer 9

try to spin implant out at same torque you put it in at – so if you can get it out with same its NOT osseointegrated - it should require more torque to spin it out due to secondary stability

Question 10

RFA

Answer 10

Resonance Frequency Analysis

• principles of tuning fork
• non-linear correlation to micro mobility – scale from 1-100 ISQ

Question 11

RFA of high frequency means?

Answer 11

the stiffer the interface between the bone and the implant the higher the frequency

Question 12

scale of RFA

Answer 12

1-100 ISQ

Question 13

how RFA works

Answer 13

magnetic pulses vibrates the smartpeg attached to the implant
vibration frequency is measured – more stable = higher frequency

1. measure at day of implant placement
2. measure again

Question 14

ISQ has correlation to?

Answer 14

strong correlation to MICRO-MOBILITY

resistance to lateral micro movement

Question 15

what does torque measure?

Answer 15

resistance to shear forces

Question 16

if test frequency twice what does this allow?

Answer 16

1. verify the initial mechanical stabilty

2. determine the degree of osseointegration

Question 17

collar effect with torque test

Answer 17

peak torque could give high values due to the implant collar seated in the cortical bone

Question 18

good measurement on ISQ?

Answer 18

60-70

micro-mobility decreases approximatley 50% between 60-70 ISQ

Question 19

final stability level for an implant is compromised of?

Answer 19

mechanical stability and biological stability

Question 20

is stability constant?

Answer 20

NO – likley to be an initial decrease in stability followed by an increase as the implant becomes biologically stable

Question 21

what happens to biologic stability and mechanical?

Answer 21

mechanical will decrease and biologic will increase

Question 22

3 tests used to test osseointegration

Answer 22

1. percussion
2. torque
3. RFA