Endodontics

A detailed anatomical diagram of the human tooth, highlighting dentinal tubules and pulp tissue, with labels on the different parts.

Endodontics Quiz

Test your knowledge in the fascinating field of endodontics with this comprehensive quiz.

Topics covered include:

Dentinal tubules
Pulp tissue structure
Cementum and radicular cysts

60 Questions15 MinutesCreated by StudyingTooth42

The diameter of dentinal tubules at the inner surface of the dentin is:?

1-1.5 m

1.5-2 m

2-2.5 m

2.5-3 m

In the peripheral dentin, the number of dentinal tubules is about:

10000/ mm2

20000/ mm2

1000/ mm2

2000/ mm2

At the inner surface of the dentin, the number of dentinal tubules is:

50/ mm2

500/ mm2

5000/ mm2

50000/ mm2

Which of the following may not be found in dentinal tubules?

Tissue fluid

Odontoblastic process

Collagen fibers

Elastic Fibers

Decreased size of pulp chamber and root canals of aged teeth is due to:

Primary dentin

Secondary dentin

Peritubular dentin

Mantle dentin

With increasing age, dentinal tubules:

Remain the same

Increasingly become larger

Increasingly become obliterated

May either remain the same or become larger

Which are the most numerous cells in the pulp?

Odontoblasts

Preodontoblasts

Fibroblasts

Mesenchymal stem cells

Which cells produce collagen and ground substance of the pulp tissue?

Odontoblasts

Preodontoblasts

Fibroblasts

Mesenchymal stem cells

Which cells serve as reserve cells in the pulp tissue?

Odontoblasts

Fibroblasts

Undifferentiated cells

Osteoblasts

Which of the following cells are not found in the pulp tissue?

Ameloblasts

Odontoblasts

Vascular and neural cells

Cells of immune system

Fibers in the pulp tissue are mainly:

Collagen

Elastic fibers

Both collagen and elastic fibers equally

Other types of fiber neither collagen nor elastic fibers

Pulp stones are most often seen in:

Aged pulp or chronically inflamed pulp

Young pulp or chronically inflamed pulp

Aged pulp or acute inflamed pulp

Young pulp or acute inflamed pulp

The clinical implication of pulp stones is:

The larger the pulp stone, the more painful the tooth will become

The larger the pulp stone, the more likely it may block access to canals or the root apex

Nothing

The presence of pulp stones helps clinicians in making an accurate diagnosis.

The most extensive branching of the blood vessels occurs in which part of the pulp tissue?

Centre of the pulp

In the root canal

Near the apex

In the subodontoblastic layer

The innervation of the pulp tissue consists of:

A-fibers and C-fibers

A-fibers and B-fibers

B-fibers and C-fibers

C-fibers and D-fibers

The plexus of Raschkow is located:

Beneath the cell-free zone

Beneath the cell-rich zone

In the center of the pulp chamber

Beneath the odontoblast layer

Which of the following statements is not correct about the age changes in the dental pulp?

The odontoblastic layer becomes reduced or missing

Fibrosis is common

Pulp stones decrease

Number of cells is reduced

What does CDJ stands for?

Cementodentinal junction

Cervicodentinal junction

Cementodentinal joint

Cervicodentinal joint

Disparities between the radiographic apex and the apical foramen, and also a funnel-shaped opening to the foramen are due to:

Deposition of dentin

Deposition of cementum

Deposition of alveolar bone

Deposition of periodontal ligament

Cementum cannot be resorbed by:

Orthodontic movement

Inflammatory lesions in periodontal ligament

Idiopathic resorption

Tooth drifting

Which cell type is the source of radicular cyst formation?

Periodontal ligament cells

Cementoblasts

Fibroblasts

Epithelial cell rests of Malassez

Which bone lines the socket of the tooth?

Cortical bone

Mylohyoid bone

Alveolar bone

Ramus

Lamina dura is:

A radiopaque narrow zone lining the socket of the tooth seen radiographically

A radiolucent narrow zone lining the socket of the tooth seen radiographically

A radiopaque narrow zone surrounding the apex of the tooth seen radiographically

A radiolucent narrow zone surrounding the apex of the tooth seen radiographically

The absence of lamina dura is usually indicative of:

Periradicular inflammation

Pulp inflammation

Root resorption

Resorption of cementum

What are the responses of the pulp tissue to non-destructive stimuli?

Minute and rapid movement of dentinal fluid

Minute and slow movement of dentinal fluid

No response

Huge amount and rapid movement of dentinal fluid

Which of the following stimuli can be considered as non-destructive?

Pulp exposure due to operative procedure

Dental caries

Limited elastic deformation of dentin due to a sudden heavy load on the tooth

Traumatic injuries

Which of the following is not one of the protective mechanisms of the pulp tissue to non-destructive stimuli?

Reflex withdrawal

Pain

Increase in local blood flow

Edema formation

Which are the characteristics that make the pulp tissue different from other soft connective tissues in the human body?

Encased within hard-tissue walls but rich of collateral blood supply

Encased within hard-tissue walls and lack of collateral blood supply

Not encased within hard-tissue walls and rich of collateral blood supply

Not encased within hard-tissue walls but lack of collateral blood supply

How does the pulp tissue initially react to irritants?

With local inflammation in the area subjected to the irritants

With the inflammation throughout the pulp

With total pulp necrosis

With partial pulp necrosis

Which of the following is not one of the etiologies of pulpitis?

Microbial factors

Traumatic injuries

Iatrogenic factors

Hygienic factors

How do bacteria and their byproducts usually reach the pulp?

When the pulp is exposed by caries

Through the dentinal tubules

Through the cracks

When the pulp is exposed by traumatic injuries

Which dentin plays a role in creating the sclerosis of the dentinal tubules?

Secondary dentin

Primary dentin

Peritubular dentin

Intratubular dentin

Exposed dentin is not caused by:

Cracks

Periodontal treatment

Erosion

Enamel hypoplasia

The inflammatory reaction of the pulp tissue to exposed dentin is:

Mild and will not usually lead to pulpal necrosis.

Mild but will usually lead to pulpal necrosis.

Severe but will not usually lead to pulpal necrosis.

Severe and will usually lead to pulpal necrosis

Which of the following types of traumatic injuries will not usually result in infectious inflammation of the pulp?

Complicated crown fracture

Root-fractured teeth where the fracture line is in communication with oral cavity

True-alveolar fracture with no displacement of the coronal fragment

Luxated teeth

Which restorative procedure is not likely to irritate the pulp?

Marginal leakage

Preparation trauma due to dehydration of the dentin

Cleansing cavity with air-water spray

Effect of restorative material

How can oral and maxillofacial surgery cause pulp injury and necrosis?

By severing or interrupting blood vessel to the pulp.

By using local anesthetic containing high concentrations of epinephrine.

By flap elevation

By intrasulcular incision

The end result of pulp polyp is:?

Self-repair and become normal pulp

Pulp necrosis

Remains as pulp polyp

Just chronic inflamed pulp and never develop to pulp necrosis

Which is the initial phase of pulpitis pathogenesis?

Neutrophil infiltration

Vascular phase

Lymphocyte involvement

Spreading of the inflammation

Liquefaction necrosis is caused by:

Chemical agent

Infectious agent

Loss of blood supply

Mechanical removal of the pulp tissue, I.e. Pulp extirpation

Ischemic necrosis is caused by:

Chemical agent

Infectious agent

Loss of blood supply

Mechanical removal of the pulp tissue, I.e. Pulp extirpation

In which condition will the repair of the pulp be likely resulting as completed regeneration?

Mild local inflammation

Moderate local inflammation

Severe inflammation

Following pulp capping procedure

Anachoresis is:

The infection via blood circulation

The Infection via accessory canals from periodontal pocket

The infection via caries

The infection via exposed dentin at the cervical area

What is the main cause of apical periodontitis?

Trauma

Iatrogenic factors

Bacterial infection

High occlusion

The bacteria involved in apical periodontitis range between:

1 to 5 species

5 to 10 species

10 to 50 species

50 to 100 species

Bacteria responsible for extraradicular infection are mainly:

Streptococcus species

Enterococcus species

Actinomyces species

Spirochete

Which is not one of the iatrogenic causes of apical periodontitis?

Over-instrumentation

Dressing medicaments

Root canal sealers

Pulp necrosis

Apical periodontitis cannot heal spontaneously if caused by:

Trauma

Over-instrumentation

Dressing medications or root canal sealers

Root canal infection

A common name of chronic apical periodontitis is:

Apical abscess

Periapical granuloma

Periapical cyst

Radicular cyst

Which of the following statements is correct?

True apical cysts occur less frequently than apical pocket cysts

True apical cysts occur as frequently as apical pocket cysts

True apical cysts occur more frequently than apical pocket cysts

Apical pocket cysts occur more frequently than true apical cyst.

Which statement is not true about true apical cysts?

True apical cysts are not likely to heal by orthograde root canal treatment

True apical cysts are completely enclosed in epithelial lining

True apical cysts have an opening to the root canal

True apical cysts occur more frequently than apical pocket cysts

Which statement is not true about apical pocket cysts?

Apical pocket cysts are likely to heal following orthograde root canal treatment

Apical pocket cysts are completely enclosed in epithelial lining

Apical pocket cysts have an opening to the root canal

Apical pocket cysts occur more frequently than true apical cysts

Healing of apical periodontitis may occur as scar tissue. This is particularly true in:

Young patients

Female patients

Adult patients

Elderly patients

Which of the following statements is true?

Apical periodontitis always appears as periapical radiolucencies

Granuloma and cyst cannot be differentiated radiographically

Granuloma and cyst cannot be differentiated histologically

CBCT cannot help differentiating between granuloma and cyst.

Which may not be a differential diagnosis of apical periodontitis as seen radiograpically?

Vertical root fracture

Periodontal disease

Tumors and cysts of the jaw.

Maxillary sinus

What is the chief complaint?

Is what observed by the clinician

Is the reason for seeking treatment

Is the diagnosis made by the clinician

Is the interpretation of data obtained from clinical signs and symptoms, radiographs and other tests

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