ceramics II- all ceramics- QUESTIONS ONLY

lecture given 5/7/2026

Esthetics may be improved when using all ceramic restorations as opposed to porcelain fused to metal because:

A. Ceramic is stronger.

B. Ceramic is more translucent.

C. Ceramic accelerates light.

B. Ceramic is more translucent.

Fracture Toughness tends to increase when:

A. Crystal size and content increase.

B. Crystal size decreases and content increases.

C. Crystal size and content decrease.

B. Crystal size decreases and content increases.

As the diameter of a machining bur decreases, the accuracy of the machined restoration:

A. Decreases.

B. Does not change.

C. Increases.

C. Increases.

According to Dr. Giordano: The most famous monolith is:

A. Bell Rock in Sedona, AZ.

B. Ayers Rock In Australia

C. In 2001: A Space Odyssey

C. In 2001: A Space Odyssey

As ceramic materials age in the mouth, the mechanical properties:

A. Do not change.

B. Tend to increase.

C. Tend to decrease.

C. Tend to decrease.

A monolithic restoration is composed of:

A. An underlying framework and a separate veneer.

B. A single material throughout the restoration.

C. A variable multi-layered composite .

B. A single material throughout the restoration.

A monolithic restoration may have superior clinical longevity because:

A. There are no joints or seams between layers.

B. Layered restorations have high stress at the layer interface.

C. False, monolithic materials have the same failure rates as layered ceramics.

A. There are no joints or seams between layers.

The primary selection of a ceramic restorative material is based on:

A. Strength only.

B. Esthetics only.

C. Tooth reduction and thickness of the ceramic that can be achieved.

C. Tooth reduction and thickness of the ceramic that can be achieved.

The two machined molar ceramic crowns you delivered fractured even after you polished and glazed the restoration. This is most likely due to:

A. Rounded internal line angles.

B. Sharp internal line angles.

C. Ceramic was too thick.

B. Sharp internal line angles.

Machined e.Max glass ceramics require crystallization. If the crystallization cycle is too short:

A. There might be under-crystallization.

B. The material might be soluble.

C. A and B.

C. A and B.

You followed all the proper procedures for shade selection. The shade of the machined e.Max restoration you crystallized chairside looks nothing like the selected shade. What is a likely explanation?

A. The cycle was too fast.

B. The furnace temperature is not correct.

C. A and B.

C. A and B.

Biaxial Flexural Strength generally gives strength values that are higher than bend bar tests:

A. True

B. False

A. True

When materials with a glass matrix are bonded to the tooth using a composite resin cement instead of using a non-bonded cement:

A. Load to failure of the restored tooth is higher when bonded.

B. Load to failure of the restored tooth is the same when bonded.

C. Load to failure of the restored tooth is lower when bonded.

A. Load to failure of the restored tooth is higher when bonded.

You have three types of blocks available to you. A glass ceramic (Celtra Duo), a feldspathic type (MKII), and an interpenetrating phase material (Enamic). Tooth reduction is 1.0 mm.

Which do you choose:

A. MKII.

B. Celtra Duo

C. Enamic.

C. Enamic.

Interpenetrating phase materials like Enamic resist crack propagation due to:

A. The separate glass filler and polymer phases.

B. The interconnected ceramic and polymer phases.

C. The dual polymer network.

B. The interconnected ceramic and polymer phases.

Composite resin block materials have several advantages over direct composite resins. These include:

A. Lower elastic modulus.

B. Dense nearly pore free restorations.

C. dual polymer network.

B. Dense nearly pore free restorations.

Composite resin block materials and Enamic have one important property in common:

A. High elastic modulus.

B. Similar Microstructure.

C. Stress absorbing properties.

C. Stress absorbing properties.

tribbles do not like?

klingons