Tutorial 5 - Metal Framework Tryin

Question 1

LOs

Answer 1

Question 2

What steps would you have done before metal framework try-in?

Answer 2

Question 3

What should you do when you first get your metal framework?

Answer 3

Question 4

Why may framework not fit on the cast model?

Answer 4

• problem in casting of metal after wax pattern
• wax pattern - (put investment material and burn it out) when casting the metal, there may have been thermal expansion of the metal, may have been expansion if gypsum

Question 5

What clues can you obtain by studying the models that you may have problems fitting your framework?

Answer 5

• distortion of cast

Question 6

Eg of cast problem

Answer 6

Question 7

Answer 7

Question 8

Answer 8

Question 9

Answer 9

Impression made may have been incorrect therefore fits on cast but patients actual mouth is different

• related to impression pouting - discrepancy between model + mouth
• may have taken alginate impression - expand over time due to moisture
• modifications made after impression was taken

Question 10

Answer 10

Question 11

• 2 nd impression of patient taken later = more detailed

Question 12

Question 13

1
What to check during metal framework tryin?

2
What not to do? Why?

Answer 13

1
- make sure it is not hurting the patient
- make sure the framework is seated down completely
- can use cast to help determine path of insertion and then place in patient mouth

2
- force framework into patients mouth
- as may hurt the patient or get stuck
- HENCE better to take step back and take another impression and try again

Question 14

How can you tell if the framework is seated down completely? / what do you look at?

Why are these important to look at?

Answer 14

Question 15

If framework does not seat down fully,
1
How will you check where the issue is

2
how will you correct this?

Answer 15

1
- can use articulations paper to check occlusion

• use green occluding spray to check where framework is not correctly placed i mouth
• spray green spray all over metal framework
• place in patient mouth
• in tight spaces spray would rub away
• are with no green = quite tight + would need to be trimmed down

2
- can trim down framework tight areas BUT can only do this to a certain extent as if over trim there is a risk of framework breaking (TIP metal can get hot when trim down so ensure you allow it to cool before placing it back in patients mouth)

• can adjust metal components
• can use Adams pliers to adjust clasps - need to be careful as clasps can snap if adjusted too many times
• can add a bit of composite if need to create undercut to allow clasp to be retentive

Question 16

Rather than adjusting a loose claps at the framework stage, what can we do?

Answer 16

Question 17

Answer 17

• may need to clean + disinfect secondary trays + retake impressions

Question 18

If frame work fits down well what else do we need go check?

How?

Answer 18

• if premature contact want to correct eg by using burns to trim down area ETC

Question 19

1
What may prevent patients teeth coming together?

2
What is preventing them coming together in the image?

3
How may we overcome this?

Answer 19

Question 20

Answer 20

Question 21

Answer 21

Question 22

If the framework fit is acceptable what is the next clinical stage?

Answer 22

• definitive jaw reg

(Sometimes metal try-in + definitive jaw reg stages are combined hence next stage in this case would be wax try in stage)

Question 23

What instructions do you need to write on your lab prescription?

Answer 23

• please add wax occlusal rims to the framework

Question 24

Answer 24

Question 25

What is it?

Answer 25