DHY 1281: FINAL EXAM 2024 QUESTIONS AND COMPLETE
SOLUTIONS 100% VERIFIED BY EXPERTS
What characterizes dentinal hypersensitivity?
Short, sharp pain from exposed dentin.
What type of stimulus initiates dentinal hypersensitivity?
Tactile, mechanical, thermal, evaporative, osmotic, chemical
What are the main etiologies of hypersensitive dentin?
Anatomy of tooth structures, dentin exposure, hydrodynamics and neural activity.
What nerve fiber is responsible for evoking the sharp, short pain responsible for
dentinal hypersensitivity?
A-delta fibers
The tubules in sensitive areas are _______ and more numerous and are open.
wider
What factors contribute to gingival recession?
Age. tooth type, bacterial plaque, toothbrush trauma, occlusal trauma, facial version,
tight frenums, SRP, perio surgery, crown prep, oral piercings.
What factors contribute to loss of enamel and dentin?
Gap CEj, thin cementum, attrition, abrasion, erosion, brushing after acid exposure,
abfraction, crown prep, instrumentation, root caries.
What is the hydrodynamic theory?
Fluid movement creates pressure on nerve endings, causing pain.
What type of pain results in severe, intermittent or throbbing pain?
Pulpal caries
What conditions have similar s/s of dentinal hypersensitivity?
Chipped teeth, fractures, pulpal pathology, leaking restorations
How long does it take for decreased hypersensitivity?
2-4 weeks
, Dentinal hypersensitivity occurs in most populations at prevalence of...
10-30%
What normally occludes the dentinal tubules?
Smear layer
What is tactile or mechanical stimuli?
Contact w/ toothbrush, utensils, instruments, friction from appliances
What is thermal stimuli?
Hot or cold temp - cold is more common.
What is evaporative stimuli?
Dehydration of fluids, HVE, drying teeth
What is osmotic stimuli?
Alteration of pressure in dentinal tubules due to solubility
What is chemical stimuli?
Acids from citrus, acidogenic bacteria, GERD, whitening formulas
What is peritubular dentin?
Thicker, highly mineralized dentin, created from trauma
When is primary dentin formed?
Before completion of apical foramen
When is secondary dentin formed?
After apical foramen is completed
What does the smear layer do for the dentinal tubules?
Occludes them by forming a smear plug that blocks stimuli.
What does calculus provide for exposed dentin?
Provides a protective coating from stimuli.
What stimulus elicits pain?
Nonnoxious stimulus such as cold water can mimic pain.
What is occlusal pressure indicative of?
Pulpal pathology
What happens to the dentinal tubule orifice in the presence of biofilm?
It increases 3x the original size - with effective biofilm removal there is a 20% decrease
in size.
SOLUTIONS 100% VERIFIED BY EXPERTS
What characterizes dentinal hypersensitivity?
Short, sharp pain from exposed dentin.
What type of stimulus initiates dentinal hypersensitivity?
Tactile, mechanical, thermal, evaporative, osmotic, chemical
What are the main etiologies of hypersensitive dentin?
Anatomy of tooth structures, dentin exposure, hydrodynamics and neural activity.
What nerve fiber is responsible for evoking the sharp, short pain responsible for
dentinal hypersensitivity?
A-delta fibers
The tubules in sensitive areas are _______ and more numerous and are open.
wider
What factors contribute to gingival recession?
Age. tooth type, bacterial plaque, toothbrush trauma, occlusal trauma, facial version,
tight frenums, SRP, perio surgery, crown prep, oral piercings.
What factors contribute to loss of enamel and dentin?
Gap CEj, thin cementum, attrition, abrasion, erosion, brushing after acid exposure,
abfraction, crown prep, instrumentation, root caries.
What is the hydrodynamic theory?
Fluid movement creates pressure on nerve endings, causing pain.
What type of pain results in severe, intermittent or throbbing pain?
Pulpal caries
What conditions have similar s/s of dentinal hypersensitivity?
Chipped teeth, fractures, pulpal pathology, leaking restorations
How long does it take for decreased hypersensitivity?
2-4 weeks
, Dentinal hypersensitivity occurs in most populations at prevalence of...
10-30%
What normally occludes the dentinal tubules?
Smear layer
What is tactile or mechanical stimuli?
Contact w/ toothbrush, utensils, instruments, friction from appliances
What is thermal stimuli?
Hot or cold temp - cold is more common.
What is evaporative stimuli?
Dehydration of fluids, HVE, drying teeth
What is osmotic stimuli?
Alteration of pressure in dentinal tubules due to solubility
What is chemical stimuli?
Acids from citrus, acidogenic bacteria, GERD, whitening formulas
What is peritubular dentin?
Thicker, highly mineralized dentin, created from trauma
When is primary dentin formed?
Before completion of apical foramen
When is secondary dentin formed?
After apical foramen is completed
What does the smear layer do for the dentinal tubules?
Occludes them by forming a smear plug that blocks stimuli.
What does calculus provide for exposed dentin?
Provides a protective coating from stimuli.
What stimulus elicits pain?
Nonnoxious stimulus such as cold water can mimic pain.
What is occlusal pressure indicative of?
Pulpal pathology
What happens to the dentinal tubule orifice in the presence of biofilm?
It increases 3x the original size - with effective biofilm removal there is a 20% decrease
in size.
