TCDHA DENTAL MATERIALS MIDTERM EXAM WITH
COMPLETE QUESTIONS AND ANSWER [VERIFIED
ANSWERS] RATED A GRADE 2024/2025
material subject to repeated stress such as in mastication may be subject to fracture
due to - ✔✔answers✔✔fatigue failure
Galvanism - ✔✔answers✔✔The phenomenon of electric current being transmitted
between two dissimilar metal
Thermal conductivity - ✔✔answers✔✔The rate at which heat flows through material
over time
internal reaction to an externally applied force is called - ✔✔answers✔✔stress
Retainer - ✔✔answers✔✔part of bridge that fits over the abutment
Pontic - ✔✔answers✔✔false/artificial tooth
Abutment - ✔✔answers✔✔supporting natural tooth
esthetic materials used for restoration of enamel need high? - ✔✔answers✔✔vitality
leakage of fluids and debris extending along the tooth restoration interface is called -
✔✔answers✔✔microleakage
excessive film thickness may cause - ✔✔answers✔✔improper seatiing of restoration
the safe interaction of a dental material with rest of the body is defined as the materials -
✔✔answers✔✔biocompatibility
which of the following restorative materials is most likely to fracture under compressive
stress? - ✔✔answers✔✔porcelain
most soluble restorative material - ✔✔answers✔✔glass ionomer
crossosion is of the greatest concern for which restorative material -
✔✔answers✔✔amalgam
, surface discoloration of a metal restoration is called - ✔✔answers✔✔tarnish
restorative materials with values of thermal conductivity similar to enamel include -
✔✔answers✔✔composite resin
defining characteristic of a solid is that it has - ✔✔answers✔✔shape and volume
most stable primary bonds - ✔✔answers✔✔have regular crystalline structures
correct term for describing the macimal amount of stress a material can withstand
without breaking is - ✔✔answers✔✔ultimate strength
when the weight of a material increases in relationship to its volume, this is described as
- ✔✔answers✔✔dense
hardness determines the materials ability to - ✔✔answers✔✔penetrate an object
when deformation is not permanent and a material recovers it has good -
✔✔answers✔✔elasticity
resistance to flow is known as - ✔✔answers✔✔viscosity
thixotropic materials are those that - ✔✔answers✔✔flow under mechanical forces
mixing time is the length of time from - ✔✔answers✔✔begining of mixing to the begining
of working time
material mixed slowly on a cooled glass surface will - ✔✔answers✔✔have a shorter
working and longer setting time
Direct restorative materials - ✔✔answers✔✔Materials fabricated directly in the mouth
Thixotropic materials - ✔✔answers✔✔liquids that flow more easily under mechanical
forces
mixing time - ✔✔answers✔✔The amount of time the operator has to bring the
components together into a homogeneous mix
Final set time - ✔✔answers✔✔The material has reached its ultimate state
Initial set time - ✔✔answers✔✔This time begins when the dental material no longer can
be manipulated in the mouth
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