Cementation of Esthetic Inlays/Onlays

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Questions and Answers

During the re-insertion of an onlay with a rubber dam, which of the following should be ensured to prevent hindrance?

The onlay is completely dry before insertion.
The operator uses magnification for better visibility.
The rubber dam, polyester strips, wedges, or Teflon do not obstruct the placement. (correct)
Sufficient pressure is applied during the seating of the onlay.

What concentration of hydrofluoric acid is recommended for pre-treating the inner surface of a press-ceramic onlay, such as Ivoclar e.max?

5% hydrofluoric acid (correct)
20% hydrofluoric acid
2% hydrofluoric acid
10% hydrofluoric acid

According to the provided guidelines, what is the recommended particle size for sandblasting the inner surface of a composite onlay?

10-20 microns
25-50 microns
50-200 microns
25-100 microns (correct)

Following the sandblasting of a composite onlay's inner surface, which of the following is the next recommended pre-treatment step?

Application of silane (B) Signup and view all the answers

The pre-treatment protocol for a prepared cavity, prior to onlay cementation, is primarily determined by which factor?

The type of adhesive cement being used (C) Signup and view all the answers

Which cement type is specifically mentioned as suitable for student practice in the provided instructions?

Nexus 3 adhesive cement (B) Signup and view all the answers

During onlay insertion, what level of pressure is recommended to ensure proper placement in the prepared cavity?

Ensure firm placement without excessive pressure to avoid damage. (D) Signup and view all the answers

For optimal removal of excess cement, at which stage should the procedure be initiated?

When the cement enters the gel phase (1-2 minutes). (D) Signup and view all the answers

When using polyester strips for proximal excess cement removal, which alternative material is suggested for use with Teflon tape?

Superfloss (C) Signup and view all the answers

At what point in the onlay cementation process should light polymerization be performed?

Only after excess cement has been removed. (C) Signup and view all the answers

What is the minimum recommended light curing duration from each direction during the polymerization step?

40 seconds (A) Signup and view all the answers

For vital teeth, what precaution is advised during the light curing process to protect the pulp from overheating?

Apply continuous air coolant and take breaks during light curing. (B) Signup and view all the answers

Which of the following tools is NOT mentioned for finishing and polishing ceramic onlays after cementation?

Steel burs (A) Signup and view all the answers

What should be checked on the articulator before cementation, specifically for non-CAD/CAM restorations?

Marginal seal, occlusion, contact points, and anatomical shape (D) Signup and view all the answers

How should the temporary filling be removed prior to cementation?

With a probe (B) Signup and view all the answers

Which cleaning agent is recommended for the prepared cavity before cementation?

Benzine or fluoride-free polishing paste (C) Signup and view all the answers

What technique can be used to check the marginal seal and integrity of the onlay in the prepared cavity?

Using an explorer or probe (A) Signup and view all the answers

What type of isolation is recommended before cementation?

Absolute isolation with a rubber dam (A) Signup and view all the answers

What should be done if the onlay does not fit due to tight contact points?

Adjust the contact points with a polishing disk or diamond bur (B) Signup and view all the answers

What can be used for matrix and wedging during cementation?

Polyester strips and plastic wedges, or Teflon tape (B) Signup and view all the answers

If Teflon tape is used instead of wedges, what additional step is required before light curing?

Clean adhesive cement excess with superfloss (D) Signup and view all the answers

When using acetone as a solvent, what bonding technique is employed and why?

Wet-bond technique, because completely drying dentin compromises the quality of the adhesive bond. (C) Signup and view all the answers

In the etch-and-rinse technique, what is the purpose of applying phosphoric acid?

To selectively etch the tooth surface, promoting better adhesion. (C) Signup and view all the answers

What is a key difference between dual-curing resin cement and self-adhesive dual-curing resin cement?

Self-adhesive cement does not require separate etching or bonding steps, while dual-curing cement may require them. (A) Signup and view all the answers

Which cement type might necessitate the use of a bond activator, and under what circumstances?

Dual-curing resin cement, when used with an etch-and-rinse adhesive system that doesn't require light curing. (D) Signup and view all the answers

When using a self-adhesive dual-curing resin cement, what practice is strictly prohibited?

Applying a separate bonding material. (C) Signup and view all the answers

Why should dentin not be completely dried when using the wet-bond technique?

It prevents the collapse of the collagen network and ensures optimal adhesion. (D) Signup and view all the answers

In etch-and-rinse technique, what is applied after the phosphoric acid and before dual-curing resin cement?

Primer and bond. (B) Signup and view all the answers

What is the recommended etching time for enamel when performing selective enamel etching in conjunction with self-adhesive dual-curing resin cement?

30-40 seconds (B) Signup and view all the answers

Flashcards

Onlay Insertion

Re-inserting an onlay while ensuring materials do not interfere.

Pre-treatment of Inner Surface

Preparation of the onlay's inner surface following material instructions.