good morning friends g all good how .pptx
good morning friends g all good how .pptx
- 3. BONDING BETWEEN METAL AND PORCELAIN.
CHEMICAL BONDING
Small amounts of certain base metals (Iron, Tin, indium,
Gallium) are incorporated.
To form oxides.
These oxides contribute to metal-ceramic adherence and
chemical bonding. - 4. MECHANICAL BONDING
Sandblasting the metal coping with 50-100 µm Al2O3.
To reduce the thick layer of casting oxides.
The opaque porcelain will flow into the microgrooves
created by the sandblasting on the surface of the alloy. - 5. SUBGINGIVAL FINISH LINE
Based on J. Kois and F. Spear there are two rules:
a. If probing depth is 1.5 mm or less, extend .5 to .7
mm below tissue.
b. If the probing depth is greater than 1.5 mm, go
half the depth of the sulcus below tissue - 10. CHECKING OCCLUSION USING 2 STEP
METHOD.
STEP 1:
Using 100 or 200 microns thick blue articulating paper.
Transferring the pigments and a thin coat of Transculase bonding agent
to the occlusal surface. - 12. STEP 2:
Take a thin film, preferably red
Offers high intensity and an excellent contrast to blue.
Editor’s Notes
- ……………by manufacturers in casting alloy compositions. SEM investigations showed that these elements accumulate at the metal-ceramic interface and form an interfacial oxide layer.
- is now a standard technique adopted to ensure the mechanical bond.
- So if we have a 1mm sulcus depth the preparation should go 0.5 mm and if we have 2 mm sulcus depth we prepare 1 mm subgingivally.
- Generally used in two step occlusal adjustment technique.
- Used to check occlusion in removable prosthesis as well as all metal or glazed fixed partial dentures.
- Used in natural dentition and occlusal adjustments during bisque trial of prosthesis.
- Implant prosthesis, proximal contacts, gauge occlusal stops and check for occlusal clearance in anterior fixed prosthesis.
- Contacts immediately get evident.
- Due to the fine coat of Transculase® bonding agent, the color transfer of the film is improved considerably.
