August 26, 2018

Sreekanth B

Dentist Freshers Interview Questions And Answers

Explain What Is Dental Caries?

Dental caries also known as cavity or tooth decay, which is caused due to bacterial infection. It causes the destruction of hard tissue of the teeth and results in demineralization of the teeth.

What Is “alveolar”?

Alveolar is used to refer a bone that is attached to the tooth.

Explain The Term Mandibular Canal?

The passage that transmits vessels and nerves through the jaw to the branches that distributes them to the teeth.

Explain What Is The Difference Between Endodontics And Orthodontics?

Endodontics:  It is the branch of dentistry which deals with a physiology, morphology and pathology of the human dental pulp and periradicular tissues. It has restricted the diagnosis and treatment upto the pulp and periradicular tissues only. They are root canal specialists and are trained to do complex root canal surgeries.

Orthodontics:  This word comes from latin word that means “straight teeth.”  Orthodontics are specialized in clear aligner therapy, appliance therapy and in braces, which are used to straightened teeth.

Explain What Periodontics Does?

Periodontics deals with the treatment and surgeries of gums, bones and connective tissues surrounding the teeth.

Explain What Is Root Canal?

Root Canal is a treatment carried out in the patient having large cavities that damage the tooth root.  The root becomes inflamed and infected in this condition.

Explain Step By Step What Is The Procedure Of Root Canal?

Step 1: First the dentist numbs the tooth by giving local anaesthetic.

Step 2: The opening is made through the crown of the tooth to the decay region or pulp chamber.

Step 3: Then unhealthy tissues and infected cells are removed using special files.

Step 4: Then shape the canal so that filling the material can be filled easily.

Step 5: Canals are filled with a permanent material.

Explain What Are The Instruments Used For Root Canal?

For root canal, the instruments used are :

Lentulo spiral filler or rotary paste filler
Finger spreader
Endodontic plugger
Gutta percha points
Obturating material sealers

Mention What Is The Ideal Properties Of Endodontic Sealer?

The ideal properties of endodontic sealer is :
  • It should create a watertight seal.
  • It should provide good adhesion with canal wall.
  • It should be radiopaque ( Visualize on x-ray ).
  • On setting it must not shrink.
  • It should be bacteriostatic.
  • It should set slowly and insoluble in tissue fluids.
  • Soluble in the standard solvent.
  • It should not stain tooth structure.
Explain The Term Crown, Enamel, Root And Dentin?

Crown: The top part of the tooth is referred as Crown, the shape of the crown determines tooth functions.

Enamel: The outermost layer of tooth is referred as Enamel.

Root: The bottom part of the tooth that is embedded in bone is referred as Root.

Dentin: Dentin is the layer of the tooth, underneath enamel.

What Is Pulp?

Pulp is the central tissue found in the center of all teeth, where blood vessels and all nerve tissues are found.

Explain What Causes Bleeding Gum?

Bleeding gums are due to the buildup of plaque at the gum line. This condition is referred as gingivitis or inflamed gums.  If plaque is not treated it would harden into tartar, which leads to increased bleeding, and it would result in more adverse form of gum and jawbone disease known as periodontitis.

What Other Than Gingivitis Can Cause Gum Bleeding?

Bleeding disorder
Brushing too hard
During pregnancy hormonal changes
Not flossing correctly
Blood thinners
Deficiency of vitamin K
Tooth or gum related infections
Inappropriate dentures or other dental appliances
Idiopathic thrombocytopenic purpura

Mention What Are The Symptoms Of Tooth Infection?

Tooth infection symptoms are :


Having pain while chewing
Hot or Cold sensitivity of the teeth
Bitter taste in the mouth
Possible fever
Breath odor
Swollen glands of the neck
General discomfort, uneasiness and ill feeling
Upper or lower jaw area swollen.

Explain What Is Trigeminal Neuralgia?

Tooth ache is generally caused by dental disease due to infection, but there is some uncommon condition like trigeminal neuralgia that causes tooth ache.  Trigeminal nerve is one of the main nerves which originates from the brain stem and enter the face, and end in the tooth bottom. When this nerve gets disturbed or damage during an accident or while operation, it causes the pain known as trigeminal neuralgia. Such condition is most commonly found among the elderly people and those having hypertension.

Mention What Are The Two Classes In Which Root Canal Material Is Classified?

Root material is classified into two classes


How Orthograde And Retrograde Filling Material Is Classified?


Solid: Silver cones, stainless steel

Semi-solid: Gutta percha

Pastes: ZnO, Resins

Combination of solid and semi-solid


Amalgam, GIC, Calcium phosphate cement, DBA, super EBA

Explain What Is The Role Of Fluoride In Tooth?

Prevents de-mineralization: In bacterial infection, bacteria combines with sugar and produces acid that damages the outer covering of tooth or enamel and starts de-mineralization of tooth. Fluoride stop acid from damaging enamel.

Re-mineralization: If there is already some damage due to acid, fluoride will deposits in the demineralized areas and begins strengthening the enamel; a process called re-mineralization

Explain What Is Dental Abscesses?

The accumulation of pus, dead tissue and other fluids due to a bacterial infection is known as dental abscesses.  It might either occur inside the pulp chamber or inside the gums.

Explain What Do You Mean By Air Abrasion?

Air abrasion is the techniques used by dentist to clean the infected area and remove dead cells.  In this technique, fine particle stream is aimed at the tooth surface.  The particles are made up of silica, baking soda or aluminium oxide.  A compressed air or gas is used to generate the force to clear the dead cells and tissues.

How Safe Are Dental X-rays?

Exposure to access amount of X-rays may cause cancer, however, controlled X-ray exposure are safe to use. With advanced digital X-ray machines which limits the radiation beam to a smaller area and for shorter period it makes even safer.

What Does The Term Mean “abutment”?

“Abutment” is an implant fixture or tooth used as a support for prosthesis.

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