Free CDT Practice Questions

Question 1

A dental laboratory receives a work authorization for a crown that does not specify which type of alloy to use. The MOST appropriate action for the technician is to:

Accepted Answer

Contact the prescribing dentist to clarify the prescription

Answer

Select a comparable alloy based on professional judgment

Answer

Use a base-metal alloy, since it is the common default

Answer

Choose the least expensive alloy to keep the case affordable

Question 2

Which permanent tooth most commonly has three roots?

Accepted Answer

Maxillary first molar

Answer

Mandibular first molar

Answer

Maxillary first premolar

Answer

Mandibular second premolar

Question 3

In the Universal Numbering System, tooth #14 is the:

Accepted Answer

Maxillary left first molar

Answer

Maxillary left second molar

Answer

Maxillary right first molar

Answer

Mandibular left first molar

Question 4

The curve of Spee is BEST described as the:

Accepted Answer

Anteroposterior curvature of the occlusal plane here

Answer

Side-to-side (mediolateral) curvature of the occlusal plane

Answer

Curvature formed by the cusps of a single posterior tooth

Answer

Angulation of each tooth's long axis relative to the midline

Question 5

In fixed prosthodontics, the term 'abutment' refers to the:

Accepted Answer

Prepared tooth that supports and retains the prosthesis

Answer

Artificial tooth that replaces the missing natural tooth

Answer

Metal component that joins the units of a bridge

Answer

Edentulous space created by a lost natural tooth

Question 6

Compared with a non-adjustable (hinge) articulator, a semi-adjustable articulator can additionally:

Accepted Answer

Simulate protrusive and lateral movements using condylar settings

Answer

Reproduce a patient's exact mandibular border movements in every dimension

Answer

Open and close only along a fixed hinge arc

Answer

Function accurately without any interocclusal bite records here

Question 7

Which gypsum product is MOST appropriate for a die that requires high strength with minimal dimensional change?

Accepted Answer

Type IV die stone

Answer

Type III dental stone here

Answer

Type II model plaster here

Answer

Type V high-expansion die stone

Question 8

A casting alloy contains 78% gold, 12% platinum, and 5% palladium, with the balance being base metals. Under the ADA classification, this alloy is:

Accepted Answer

High noble in general

Answer

Noble

Answer

Predominantly base metal

Answer

Non-precious

Question 9

Casting a high-fusing base-metal alloy such as cobalt-chromium REQUIRES which type of investment?

Accepted Answer

Phosphate-bonded investment

Answer

Gypsum-bonded investment

Answer

Resin-bonded investment here

Answer

Hydrocolloid-bonded investment

Question 10

Mixing dental stone with more water than the recommended water-to-powder ratio will:

Accepted Answer

Decrease the compressive strength of the set cast

Answer

Increase the compressive strength of the set cast

Answer

Increase the setting expansion of the cast

Answer

Leave the set cast's properties unchanged

Free CDT Practice Questions

Domain 1: Dental Laboratory Industry Regulations and Scope of Practice (8-10%)

Question 1

Domain 2: Anatomy (17-19%)

Question 2

Question 3

Question 4

Domain 3: Terminology and Principles (6-8%)

Question 5

Domain 4: Articulation (6-8%)

Question 6

Domain 5: Identify the types, processes, physical properties and handling characteristics of dental lab materials (e.g., Traditional or Digital) (34-36%)

Question 7

Question 8

Question 9

Question 10

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