Question

Prior to cementing an all ceramic crown, the prepared tooth should be cleaned with:

• A. Glycerin based pumice
• B. Water based pumice
• C. Fluoridated pumice
• D. Non-fluoridated pumice

Hint:

Avoid fluoridated or oily cleaning agents before adhesive cementationThey may compromise bond strength.

Answer 1

The Correct Option is D

Step 1: Importance of Cleaning Before Cementation.
Before cementing an all-ceramic crown, the prepared tooth surface must be free from debris, temporary cement residues, plaque, and contaminantsProper cleaning ensures optimal bonding strength and long-term retention of the restoration
Step 2: Role of Pumice.
Pumice is commonly used to clean the tooth surfaceHowever, the type of pumice used is importantFluoride-containing pumice may leave fluoride residues on enamel and dentin surfacesThese residues can interfere with bonding procedures, especially when resin cements are used
Step 3: Evaluation of Options.
(A) Glycerin based pumice: Glycerin may leave an oily residue, which can compromise bonding
(B) Water based pumice: While acceptable, it must also be non-fluoridated to avoid interference
(C) Fluoridated pumice: IncorrectFluoride can reduce bonding effectiveness by altering the tooth surface
(D) Non-fluoridated pumice: CorrectIt effectively cleans the surface without interfering with adhesive bonding
Step 4: Conclusion.
Therefore, prior to cementing an all-ceramic crown, the prepared tooth should be cleaned with non-fluoridated pumice