models, duplication, vacuume mixing

Question 1

name 3 purposes of duplication

Answer 1

1. create master model
2. create a wokring model - saves master model from damage
3. allows fitting of pros to master model = saving pt/ clinic time + cost

Question 2

list 4 materails that can be used for duplication

Answer 2

1. imp materials
2. hydrocolloid
3. silicon
4. putty

Question 3

outline the steps of duplication

Answer 3

1. soak model 30 mins
2. pat dry with paper towel [do not use air gun - will disperse oils which affect hydrocolloid bonding
3. place in flasj
4. pur hydrocolloid and place in cold water bath of min. 3cm for 1 hr

Question 4

list two reasons for vacuum mixing + 3 materails which can be used

Answer 4

1. environment devoid of air = avoids incorporation of bubbles in mix = prevents formation of air pockets
2. yields homogenous and bubble free compounds

materials
1. gypsum material - models
2. investments - metal frame works
3. silicon - duplication

Question 5

list the steps of the vacuum mixing process

Answer 5

1. machine setting = 300 rpm 20 sec
2. ensure there is no loose powder in the bowl
3. ensure the seal is clean and free of any product
4. insert bowl and press start - wait until 100% is reached
5. press start
6. following completion, press start and catch the bowl as the vacuum seal is released
7. wash bowl and lid after pouring up