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NBDHE practice exam 270 Questions and answers

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Prepare to pass the National Board Dental Hygiene Examination (NBDHE) with this extensive 270-question practice exam. This comprehensive resource mirrors the scope and style of the official board exam, covering all key content areas: scientific basis for dental hygiene practice, provision of clinical dental hygiene services, community health/research principles, and case-based patient care. Each question includes a verified correct answer and a concise rationale explaining the underlying concept. This complete test bank is designed to identify your strengths and weaknesses, reinforce core knowledge in pharmacology, periodontology, radiology, ethics, and patient management, and build the stamina and confidence needed for exam day success.

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NBDHE practice exam 270 Questions
and answers
intercellular ground substance is composed of -
✅protein carbohydrate complexes

What RNA virus is associated with the common cold? -
✅Rhinovirus

Which generalization is correct about proximal contact areas? -
✅Anterior teeth have contact areas that are generally centered faciolingually

Slightly damaged tissues completely returns to its normal structure and function in
which healing process? -
✅Regeneration

Pain sensation might be blocked from going to the central nervous system by other
stimuli. This is best explained by which theory? -
✅Gate Control

What term refers to complete obstruction of blood flow to a particular area -
✅infarction

The most common autopsy finding in instances of sudden death as a result of
myocardial infarction is -
✅coronary thrombosis

formation of blood clot inside a blood vessel of the heart -
✅Coronary Thrombosis

Deep cervical nodes are distributed along what? -
✅Internal jugular vein

What is true regarding saltatory conducti -
✅-it involves Nodes of Ranvier
-It is energy saving
-It is faster

Which lipoprotein contains the greatest amount of protein? -
✅High density

What is the functional unit of Striated muscle? -
✅Sarcomere

developmental macroglossia? -
✅Myxedema

,Characteristics of salivary glycoproteins -
✅-Enhance binding of bacteria to tooth surfaces
-Interact with calcium and phosphate in hydroxyapatite
-Results from lysis of bacterial walls

What factors determine the position of the first permanent molar? -
✅Primary arch length

Which characteristic of bacteria influences relative numbers in early plaque? -
✅adherence to pellicle

What id produced in the nucleolus? -
✅Ribosomal RNA

The two buccal roots are about the same length in -
✅Perm MAX 2nd molars

Anticholinergic drug used to reduce airway secretions? -
✅Atropine- used to decrease saliva flow for dental procedures

Cholinergic drug used to increase saliva flow in patients with Sjogrens Syndrome -
✅Pilocarpine

immune system disorder characterized by dry eyes and dry mouth -
✅Sjogrens syndrome

Drugs that mimic the parasympathetic nervous system -
✅Cholinergic

Drugs that block the parasympathetic nervous system -
✅Anti-cholinergic

anti-inflammatory action of aspirin is in part due to -
✅inhibition of the enzyme cyclooxygenase, which leads to the formation of
prostaglandins (that cause inflammation)

Guanethidine (antihypertensive) is especially prone to produce which adverse
effect? -
✅Depression

In normal blood count, which is the most numerous white blood cell? -
✅Neutrophils

Thyroxine -
✅Also called thryoid hormone, thyroxine is produced and secreted by follicle cells in
the thyroid gland. it targets all cells in the body and increases overall body
metabolism.

, Which primary teeth are the first to erupt? -
✅Mand centrals

Max centrals/ Mand laterals -
✅7yrs

Max lateral -
✅8yrs

Max Canine/ Md 2nd PM and 2molar -
✅11 yrs

Mx 1st and 2nd PM
Md 1st PM -
✅10yrs

Max 1st Molar
Md 1st Molar -
✅6yrs

Max 2nd molar
Md 2 molar -
✅11yrs

Most often missed mesial coronal and root concavity -
✅Max 1st premolar

Premolar most often having 2 roots -
✅Max 1st premolar

Cuspid with occasionally bifurcated root -
✅Mandibluar

Tooth which most often fails to develop -
✅third molar or maxillary lateral

Non-functional lingual cusp -
✅Mandibular first premolar

Premolar which commonly has 3 cusps -
✅mandibular second premolar

Tooth most often affected by microdontia -
✅Maxillary lateral incisor

tooth most likely to exhibit lingual caries -
✅Maxillary lateral incisor

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