W8 - Cementation & Bonding - Abbott Flashcards
What material is used to cement Zirconia, gold, PFM?
Rely X Unicem
How does Rely X Unicem set?
Dual cure
4 minutes to set by itself
What is the problem with trying on the zirconia crown?
Zirconia fitting surface gets contaminated with calcium and phosphate ions in the saliva
How do you clean saliva contaminated zirconia?
Ivoclean by Ivoclar
What instruction must you send to the lab to ensure crown has good micromechanical retention?
“Please aluminium oxide blast the fitting surface with 35-40 microns”
Why must zirconia crowns be aluminium oxide blasted?
Phosphoric acid will not etch zirconia
Why don’t you need to aluminium oxide blast Emax?
Emax can be etched using Hydrofluoric acid
What can be used instead of HF acid to etch Emax?
Ivoclean & Monobond etch and prime
- Emax ONLY // NOT for zirconia*
- this silanates the surface, allowing you to bond resin directly to it
What is used to cement zirconia crowns at JCU Dental?
Ivoclar SpeedCEM Plus
- self adhesive
- self curing
- option of light curing
Advantages of digital dentistry (5)
Better fitting restos
More diversity
Increased speed in resto techniques
More time efficient solution at lower cost
More predictable outcomes
When should you bond zirconia, rather than cement it?
If preparation lacks retention
- This may also require crown lengthening to be successful
What must you do if you adjust the occlusal surface of zirconia
Polish
- Otherwise will rapidly wear opposing tooth
What product is used to polish zirconia
Zircon Brite
How do you adjust zirconia crowns?
Should be done OUTSIDE the mouth
Place crown in mouth
Articulation paper - tap tap tap
Take out - put on model
Use slow speed electric motor
Fine bur - NOT coarse
Put back in mouth - tap tap tap
How do you adjust Emax crowns?
Must be bonded in place before checking occlusion
- Will crack otherwise
