7. Soldering Flashcards
DEFINITIONS
Soldering: Joining closely approximated solid metal parts with a ____ metal
Liquidus of filler ____oC
Welding - Joining metals with or without ____ – ____ fusion of the parts joined
filler 450 450 filler partial
Types Of Soldering Pre-veneer (Pre-ceramic) Torch melted high \_\_\_\_ solder \_\_\_\_ middle of pontic \_\_\_\_
Post-veneer (Post Ceramic)
Compensates for tooth ____
after impressions and ____ at porcelain fusing
fusing
diagonal
easy
movement
distortion
Pre-Ceramic Solders
- Insert units on prepared teeth
- Space between components ~ ____mm
- Index with self curing ____ or plaster
- Invest in ____ investment
0.20
acrylic
soldering
Pre-Ceramic Solders
• This is a basic description of the process.
• First you insert your unit (and we are talking about pre-ceramic
soldering at this point) on the prepared teeth in the patient’s mouth, and the next thing is to index the unit.
◦ You are using the index to establish the exact ____ that you want the units to be joined in.
◦ It is important that the space between – in this case we are joining these two units together and this is a separate unit we are joining them together (he points all around the pontic, I think he means that the two prepped “units” on abutment teeth are being joined by the pontic) and and notice there is a little gap here (circled, I think its the space between unit and pontic margins?). We will talk a little more about the gap but in general it is supposed to be about 0.20 mm wide and it should have two parallel surfaces about 0.20 mm thickness.
◦ So the units are inserted and you index it and the indexing is usually done – in this case its showing a glass of peri (?) indexing but there is also self curing acrylic that you can use to index your units. Once you have your indexed unit you can lift the whole thing and it comes up together.
The next thing is to ____ the unit. This is the wax ring (circled whole thing >) similar to the casting ring that we spoke about not too long ago.
◦ So we have a wax ring around the unit and you pour investment into this portion here (pink “investment” portion in diagram). It’s important that you don’t block the ____ that you are going to fill. So sometimes you might put a little piece of wax in there to close the space so when you are investing your investment doesn’t go by that space (he points to the orange circle from before).
After you’ve invested you remove your soldering index. Then you ____ it in the burnout oven, similar to what you do just before you cast your alloy you put this into an oven and heat it
And then you put it down, turn it upright with your unit showing – you heat with a torch , put a little solder here into the gap and you heat it until it melts and flows to fill the gap.
You now have your soldered unit as shown here.
These are the steps you go through if you are going to solder pieces of your restoration together.
positions
invest
gap
Pre-Ceramic Solders
- ____ invested castings in burnout furnace. 650-815oC
- Insert solder into ____ and heat with gas- oxygen flame 1050-1150oC until solder melts to fill gap.
- Cool, Breakout investment and air abrade with ____ powder
preheat
gap
aluminum oxide
Steps for Soldering
- ____
- ____
- There’s a ____ stage that is not shown here
- Then ____ with a torch
- Then the finished product is what we have here.
indexing
investing
burnout
casting
TORCH SOLDERING Soldering is done under \_\_\_\_ flame. A \_\_\_\_ torch is used for this purpose. The torch flame is brushed over the investment block until \_\_\_\_. Heat until solder flows to fill \_\_\_\_
direct
gas air
red hot
gap
Torch Soldering
Heat Sources
These are the different types of sources. ____ I mentioned is what you find in the common pipeline and you can buy ____ to use depending on the alloy you are soldering.
You must follow manufacturer’s instructions to pick the right gas to use.
natural gas
propane
TORCH SOLDERING
The flame should be constantly ____ over the solder for a period of ____ minutes.
Flame should aimed at an ____ and not be held in a ____ position.
swiped
4-5
angle
stationary
Post Ceramic Soldering
Often ____
Complete all porcelain work to finished
restoration
1. Separate with ____
2. Sandpaper roughen solder ____ area 3. Seat units
4. Soldering ____ with Duralay
unplanned
thin disk
joint
index
Post Ceramic Soldering
- Mark with pencil
- Cover porcelain with ____ and invest in Soldering investment
- Place pieces of fluxed solder into solder ____ and heat in vacuum oven.
- Use ____ solder for both ____ and ____ metals
Low Fusing solder 710-740oC
wax space gold base noble
Pre-ceramic vs Post Ceramic Solder Joints
Diagonal cut across tooth for increased ____ and ____
Interproximal cut across for increased ____
surface area
joint strength
post-ceramic solder
OVEN SOLDERING
Performed under ____ or air.
A piece of solder is placed in the ____ space and it is heated to a prescribed temperature in the furnace.
____ joint strength.
vacuum
joint
superior
INFRARED SOLDERING Used for \_\_\_\_ fusing connectors. Good \_\_\_\_. Similar strength as \_\_\_\_ soldering. Protective \_\_\_\_ is necessary.
low
accuracy
conventional
eyewear
Laser Welding
For joining Ti components of dental crowns, ____ and ____ works.
Pulsed ____ power Neodymium lasers
Low ____ influence preferred in dentistry.
____ joint strength
crowns partial denture framework high thermal superior
