Certified Dental Technician (CDT)
Practice Exam Questions And Correct Answers (Verified
Answers) Plus Rationales |2026 Q&A | Instant Download Pdf
1. What is the primary function of a dental technician?
a. Diagnose oral diseases
b. Perform oral surgery
c. Fabricate dental prostheses
d. Prescribe dental medications
Rationale: Dental technicians fabricate dental restorations and
appliances based on dentist prescriptions but do not diagnose or treat
patients.
2. Which material is commonly used for making metal frameworks in
removable partial dentures?
a. Stainless steel
, b. Cobalt-chromium alloy
c. Titanium dioxide
d. Zinc oxide
Rationale: Cobalt-chromium alloys provide strength, corrosion
resistance, and biocompatibility ideal for RPD frameworks.
3. The investment material used in casting must withstand:
a. Low temperature
b. Low expansion
c. High temperature and expansion
d. Shrinkage during heating
Rationale: Investment materials must resist high casting temperatures
and allow expansion to compensate for metal shrinkage.
4. The primary function of a die in dental casting is:
a. To provide a precise replica of a prepared tooth
b. To create a model base
c. To hold impression material
d. To act as a separating agent
Rationale: A die reproduces the exact shape and size of the prepared
tooth for crown or bridge fabrication.
5. What is the purpose of the sprue in casting?
a. Forming occlusal anatomy
b. Allowing molten metal to flow into the mold cavity
c. Cooling the metal
, d. Preventing air entrapment
Rationale: The sprue creates a channel through which molten metal
enters the mold during casting.
6. The main component of porcelain used in dental ceramics is:
a. Quartz
b. Feldspar
c. Kaolin
d. Alumina
Rationale: Feldspar forms the glassy matrix of dental porcelain when
fired, giving translucency and strength.
7. Which of the following is a common cause of porcelain fracture on
metal-ceramic restorations?
a. High fusing temperature
b. Porosity in metal
c. Improper coefficient of thermal expansion match
d. Overglazing
Rationale: Differences in thermal expansion between metal and
porcelain cause stresses leading to fractures.
8. The function of a flux in soldering is to:
a. Increase oxidation
b. Cool the solder
c. Remove oxides and prevent oxidation
d. Strengthen the joint
, Rationale: Flux cleans and protects metal surfaces from oxidation,
ensuring strong solder joints.
9. What is the purpose of a refractory model in porcelain work?
a. To withstand high firing temperatures during porcelain application
b. To improve impression accuracy
c. To store wax patterns
d. To support the articulator
Rationale: Refractory models resist heat during porcelain firing and
maintain dimensional stability.
10. Which material is most commonly used for denture base
fabrication?
a. Composite resin
b. Polyether
c. Polymethyl methacrylate (PMMA)
d. Alginate
Rationale: PMMA is widely used due to its strength, aesthetics, and
adaptability for denture bases.
11. What happens if the water-to-powder ratio of gypsum is
increased?
a. Strength increases
b. Strength decreases
c. Setting time shortens
d. Expansion increases
Practice Exam Questions And Correct Answers (Verified
Answers) Plus Rationales |2026 Q&A | Instant Download Pdf
1. What is the primary function of a dental technician?
a. Diagnose oral diseases
b. Perform oral surgery
c. Fabricate dental prostheses
d. Prescribe dental medications
Rationale: Dental technicians fabricate dental restorations and
appliances based on dentist prescriptions but do not diagnose or treat
patients.
2. Which material is commonly used for making metal frameworks in
removable partial dentures?
a. Stainless steel
, b. Cobalt-chromium alloy
c. Titanium dioxide
d. Zinc oxide
Rationale: Cobalt-chromium alloys provide strength, corrosion
resistance, and biocompatibility ideal for RPD frameworks.
3. The investment material used in casting must withstand:
a. Low temperature
b. Low expansion
c. High temperature and expansion
d. Shrinkage during heating
Rationale: Investment materials must resist high casting temperatures
and allow expansion to compensate for metal shrinkage.
4. The primary function of a die in dental casting is:
a. To provide a precise replica of a prepared tooth
b. To create a model base
c. To hold impression material
d. To act as a separating agent
Rationale: A die reproduces the exact shape and size of the prepared
tooth for crown or bridge fabrication.
5. What is the purpose of the sprue in casting?
a. Forming occlusal anatomy
b. Allowing molten metal to flow into the mold cavity
c. Cooling the metal
, d. Preventing air entrapment
Rationale: The sprue creates a channel through which molten metal
enters the mold during casting.
6. The main component of porcelain used in dental ceramics is:
a. Quartz
b. Feldspar
c. Kaolin
d. Alumina
Rationale: Feldspar forms the glassy matrix of dental porcelain when
fired, giving translucency and strength.
7. Which of the following is a common cause of porcelain fracture on
metal-ceramic restorations?
a. High fusing temperature
b. Porosity in metal
c. Improper coefficient of thermal expansion match
d. Overglazing
Rationale: Differences in thermal expansion between metal and
porcelain cause stresses leading to fractures.
8. The function of a flux in soldering is to:
a. Increase oxidation
b. Cool the solder
c. Remove oxides and prevent oxidation
d. Strengthen the joint
, Rationale: Flux cleans and protects metal surfaces from oxidation,
ensuring strong solder joints.
9. What is the purpose of a refractory model in porcelain work?
a. To withstand high firing temperatures during porcelain application
b. To improve impression accuracy
c. To store wax patterns
d. To support the articulator
Rationale: Refractory models resist heat during porcelain firing and
maintain dimensional stability.
10. Which material is most commonly used for denture base
fabrication?
a. Composite resin
b. Polyether
c. Polymethyl methacrylate (PMMA)
d. Alginate
Rationale: PMMA is widely used due to its strength, aesthetics, and
adaptability for denture bases.
11. What happens if the water-to-powder ratio of gypsum is
increased?
a. Strength increases
b. Strength decreases
c. Setting time shortens
d. Expansion increases
