DDS Prosthodontics and Restorative Dentistry

Question 1

The Angle classification of malocclusion is based on the relationship between which teeth?

Accepted Answer

Maxillary and mandibular first permanent molars (and maxillary canine to lower first premolar)

Answer

Angle's classification uses the mesiobuccal cusp of the upper first molar relative to the buccal groove of the lower first molar (and canine to premolar) as reference points.

Question 2

Which restorative material has the highest compressive strength and is most indicated for posterior stress-bearing restorations?

Accepted Answer

Amalgam

Answer

Dental amalgam has compressive strength of approximately 380–550 MPa, superior to composites and glass ionomers, making it durable for load-bearing posterior restorations.

Question 3

In complete denture fabrication, the Gothic arch (needle point) tracing is used to determine:

Accepted Answer

The centric relation position of the mandible

Answer

The Gothic arch (arrowhead) tracing records centric relation — the apex of the arrow points to the most retruded, unstrained condylar position.

Question 4

The function of a surveyor in removable partial denture fabrication is to:

Accepted Answer

Determine the path of insertion and location of undercuts on abutment teeth

Answer

A dental surveyor identifies the height of contour, undercut areas, and parallel surfaces on abutment teeth to design the path of insertion and RPD framework.

Question 5

Post-operative sensitivity after posterior composite resin placement is most commonly attributed to:

Accepted Answer

Polymerization shrinkage creating gap formation at the cavity margins

Answer

Composite polymerization shrinkage (approximately 1.5–3%) can create microleakage gaps at the dentin interface, allowing fluid movement in dentinal tubules and causing post-op sensitivity.

DDS - Doctor of Dental Surgery Practice Test

DDS - Doctor of Dental Surgery Practice Test

DDS Prosthodontics and Restorative Dentistry