unit 10- inflammatory lesions of the pulp and periapex

What is enamel?

The outermost, highly mineralised protective layer of the tooth.

What is dentin?

The porous middle layer of the tooth containing dentinal tubules.

How can dentinal tubules contribute to caries progression?

They provide a pathway for bacteria and toxins.

What is the dental pulp?

Soft connective tissue located in the central cavity of the tooth.

How does the dental pulp connect with the surrounding tissues?

It extends through the root canals to the apex, connecting with the surrounding tissues.

Structure and Function of the Dental Pulp

How is the dental pulp supplied and innervated?

It is highly vascularised and innervated.

Structure and Function of the Dental Pulp

Why is expansion of the dental pulp limited during inflammation?

It is surrounded by rigid dentin walls.

Structure and Function of the Dental Pulp

What can increased pressure inside the pulp cause during inflammation?

Pain and ischemia.

Structure and Function of the Dental Pulp

Which structures are found in the dental pulp?

Blood vessels, nerves and odontoblasts.

Structure and Function of the Dental Pulp

What are odontoblasts?

Dentin-producing cells.

Structure and Function of the Dental Pulp

What is the formative function of the dental pulp?

Dentin production.

Structure and Function of the Dental Pulp

What is the nutritive function of the dental pulp?

It supplies nutrients.

Structure and Function of the Dental Pulp

hat is the sensory function of the dental pulp?

Pain perception.

Structure and Function of the Dental Pulp

What is the defensive function of the dental pulp?

Immune response and tertiary dentin formation.

The Periapex and Its Relation to the Pulp

Which tissues are included in the periapex?

Cementum, periodontal ligament and alveolar bone.

The Periapex and Its Relation to the Pulp

How are the pulp and periapex connected?

Through the apical foramen.

The Periapex and Its Relation to the Pulp

What can happen when inflammation in the pulp extends beyond the root?

Periapical lesions can develop.

From Caries to Inflammatory Lesions of the Pulp and Periapex

Do early enamel and dentin caries cause pulp inflammation?

No, not at the early stage.

From Caries to Inflammatory Lesions of the Pulp and Periapex

What happens when bacteria or toxins reach the dental pulp?

Pulpitis begins.

From Caries to Inflammatory Lesions of the Pulp and Periapex

What can happen if pulpitis is left untreated?

Infection can extend to the periapical tissues, causing periodontitis.

Pulpitis

What is pulpitis?

Inflammation of the dental pulp.

Pulpitis

What is the most common cause of pulpitis?

• dental caries

• trauma

• thermal or chemical irritation

Pulpitis

What is the most characteristic symptom of pulpitis?

• pain

• sensitively to hot, cold or sweet stimuli

Pulpitis

How can pain present in pulpitis?

It may be spontaneous or triggered by a stimulus.

Pulpitis

In which age group is pulpitis more common?

Younger individuals.

Pulpitis

What can untreated pulpitis lead to?

Pulp necrosis followed by periapical infection.

Classification of Pulpitis

What determines the classification of pulpitis?

Its intensity, duration and tissue response.

Classification of Pulpitis

How is pulpitis classified according to prognosis or evolution?

Reversible or irreversible pulpitis.

Classification of Pulpitis

How is pulpitis classified according to clinical course and histology?

Acute or chronic pulpitis.

Classification of Pulpitis

can the acute or chronic pulpitis be reversible or irreversible

yes

Classification of Pulpitis

How is pulpitis classified according to communication with the oral cavity?

Open or closed pulpitis.

Classification of Pulpitis

What is the special form of chronic pulpitis shown in the classification?

Chronic hyperplastic pulpitis (pulp polyp).

Reversible vs Irreversible Pulpitis

How does pain present in reversible pulpitis?

Short, sharp pain that depends on a stimulus, such as cold, heat or sweet foods.

Reversible vs Irreversible Pulpitis

How does pain present in irreversible pulpitis?

Spontaneous, throbbing pain with long episodes.

Reversible vs Irreversible Pulpitis

How long does pain last in reversible pulpitis after removing the stimulus?

Seconds or minutes.

Reversible vs Irreversible Pulpitis

How long can pain persist in irreversible pulpitis?

Several minutes or hours; it may worsen at night.

Reversible vs Irreversible Pulpitis

How is pain localised in reversible pulpitis?

It is well localised, and the patient can identify the tooth.

Reversible vs Irreversible Pulpitis

How is pain localised in irreversible pulpitis?

It may be poorly localised or referred to other teeth or the jaw.

Reversible vs Irreversible Pulpitis

How does the pulp respond to stimuli in reversible pulpitis?

An exaggerated but brief response.

Reversible vs Irreversible Pulpitis

How does the pulp respond to stimuli in irreversible pulpitis?

A prolonged, lingering response; cold may relieve pain in late stages.

Reversible vs Irreversible Pulpitis

What is the degree of inflammation in reversible pulpitis?

Mild, localised inflammation.

Reversible vs Irreversible Pulpitis

What is the degree of inflammation in irreversible pulpitis?

Severe, extensive inflammation.

Reversible vs Irreversible Pulpitis

What is the expected outcome of reversible pulpitis if the irritant is removed?

The pulp can recover.

Reversible vs Irreversible Pulpitis

What treatment and outcome are associated with irreversible pulpitis?

Endodontic treatment is required, and pulp necrosis is likely.

Acute vs Chronic Pulpitis

How does acute pulpitis develop?

Rapid onset with intense inflammation.

Acute vs Chronic Pulpitis

How does chronic pulpitis develop?

Slow, long-standing inflammation.

Acute vs Chronic Pulpitis

What type of pain is associated with acute pulpitis?

Severe, spontaneous, throbbing pain.

Acute vs Chronic Pulpitis

What type of pain is associated with chronic pulpitis?

Mild, dull pain or no pain.

Acute vs Chronic Pulpitis

Which inflammatory cells are characteristic of acute pulpitis?

Neutrophils.

Acute vs Chronic Pulpitis

What other histological feature is associated with acute pulpitis?

Edema.

Acute vs Chronic Pulpitis

Which inflammatory cells are characteristic of chronic pulpitis?

Lymphocytes and plasma cells.

Acute vs Chronic Pulpitis

What additional histological feature is associated with chronic pulpitis?

Fibrosis.

Acute vs Chronic Pulpitis

Which form of pulpitis is often irreversible?

Acute pulpitis.

Acute vs Chronic Pulpitis

Can chronic pulpitis be reversible?

Yes, early on, but it may become irreversible later.

Acute vs Chronic Pulpitis

What is a typical cause or presentation of acute pulpitis?

Deep caries or recent trauma.

Acute vs Chronic Pulpitis

What is a typical cause or presentation of chronic pulpitis?

Long-standing caries, sometimes with a pulp polyp.

Acute vs Chronic Pulpitis

What is the difference between reversible/irreversible and acute/chronic pulpitis classifications?

Reversible/irreversible describes the prognosis (whether it can heal), while acute/chronic describes the pattern and speed of inflammation.

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Histology: Acute vs Chronic Pulpitis

What characterises the histological process in acute pulpitis?

A highly exudative and destructive process.

Histology: Acute vs Chronic Pulpitis

Which inflammatory cells are seen in acute pulpitis?

Neutrophils.

Histology: Acute vs Chronic Pulpitis

What vascular change is seen in acute pulpitis?

Capillary congestion.

Histology: Acute vs Chronic Pulpitis

What can cause necrosis in acute pulpitis?

Edema and thrombosis.

Histology: Acute vs Chronic Pulpitis

What characterises the histological response in chronic pulpitis?

A more organised, proliferative response.

Histology: Acute vs Chronic Pulpitis

Which tissue changes are associated with chronic pulpitis?

Fibrosis and sometimes calcifications.

Histology: Acute vs Chronic Pulpitis

Which inflammatory cells are associated with chronic pulpitis?

Lymphocytes.

Histology: Acute vs Chronic Pulpitis

What is the main histological feature of acute pulpitis?

A diffuse acute inflammatory infiltrate predominantly consisting of neutrophils.

Histology: Acute vs Chronic Pulpitis

What other histological findings may be seen in acute pulpitis?

Altered eosinophils and extravasated red blood cells.

Histology: Acute vs Chronic Pulpitis

What does the collagen accumulation in chronic pulpitis indicate?

Fibrosis in the central pulp area.

Histology: Acute vs Chronic Pulpitis

What structure is shown surrounded by collagen in chronic pulpitis?

A pulp stone.

Histology: Acute vs Chronic Pulpitis

What staining method is used for the histological images

Haematoxylin and eosin (H&E).

Open vs Closed Pulpitis

What is closed pulpitis?

Inflammation of the pulp confined within a closed cavity, with no exposure to the oral cavity.

Open vs Closed Pulpitis

What is open pulpitis?

Inflammation of the pulp with direct exposure to the oral cavity, for example through deep caries or trauma.

Open vs Closed Pulpitis

Why does pressure increase in closed pulpitis?

There is no drainage, so pressure increases inside the rigid dentin walls.

Open vs Closed Pulpitis

What happens to pressure in open pulpitis?

Partial drainage relieves the pressure.

Open vs Closed Pulpitis

What type of pain is associated with closed pulpitis?

Severe, spontaneous, throbbing pain due to compression of nerves and blood vessels.

Open vs Closed Pulpitis

How does pain present in open pulpitis?

Milder or intermittent pain, sometimes with less sensitivity.

Open vs Closed Pulpitis

What may happen to the pulp in closed pulpitis?

It is frequently acute, and rapid necrosis is possible.

Open vs Closed Pulpitis

What may happen to the pulp in open pulpitis?

It is often chronic, with surface necrosis and exposed granulation tissue.

Open vs Closed Pulpitis

What is a typical cause of closed pulpitis?

A closed deep carious cavity or a recently restored tooth.

Open vs Closed Pulpitis

What is a typical cause of open pulpitis?

A large open cavity with carious exposure or trauma.

Open vs Closed Pulpitis

What is the prognosis of closed pulpitis?

Irreversible; endodontic treatment is required.

Open vs Closed Pulpitis

What is the prognosis of open pulpitis?

Irreversible; it may progress to chronic pulpitis or a pulp polyp.

Chronic Hyperplastic Pulpitis (Pulp Polyp)

What is chronic hyperplastic pulpitis also known as?

Pulp polyp.

Chronic Hyperplastic Pulpitis (Pulp Polyp)

What type of pulpitis is chronic hyperplastic pulpitis?

A special chronic form of irreversible pulpitis.

Chronic Hyperplastic Pulpitis (Pulp Polyp)

What is chronic hyperplastic pulpitis?

Chronic inflammation with overgrowth of granulation tissue from an open carious cavity.

Chronic Hyperplastic Pulpitis (Pulp Polyp)

What is a major predisposing factor for a pulp polyp?

Long-standing carious exposure.

Chronic Hyperplastic Pulpitis (Pulp Polyp)

Which anatomical features favour the development of a pulp polyp?

A large pulp chamber, rich blood supply and open drainage.

Chronic Hyperplastic Pulpitis (Pulp Polyp)

In which patients is a pulp polyp typical?

Children and young adults with vital pulps.

Chronic Hyperplastic Pulpitis (Pulp Polyp)

What does a pulp polyp look like clinically?

A painless, reddish, soft mass filling the cavity.

Chronic Hyperplastic Pulpitis (Pulp Polyp)

What happens when a pulp polyp is touched?

It bleeds easily.

Chronic Hyperplastic Pulpitis (Pulp Polyp)

In which teeth may a pulp polyp be seen?

Teeth with wide open cavities or fractures.

Chronic Hyperplastic Pulpitis (Pulp Polyp)

How is a pulp polyp treated?

Endodontic treatment or extraction.

Chronic Hyperplastic Pulpitis (Pulp Polyp)

is it irreversible or reversible

irreversible

Histopathology of Chronic Hyperplastic Pulpitis

What type of tissue forms a pulp polyp?

Granulation tissue.

Histopathology of Chronic Hyperplastic Pulpitis

Which cells and structures are numerous in the granulation tissue of a pulp polyp?

Capillaries, fibroblasts and chronic inflammatory cells.

Histopathology of Chronic Hyperplastic Pulpitis

What may cover the surface of a pulp polyp?

Stratified squamous epithelium derived from the oral mucosa.

Transition to Periapical Disease

Where is inflammation confined in pulpitis?

Within the pulp chamber.

Transition to Periapical Disease

What happens when the pulp becomes necrotic?

Infection spreads through the root canal.

Transition to Periapical Disease

What is apical periodontitis?

Inflammation of the periapical tissues: the periodontal ligament, cementum and alveolar bone.

Transition to Periapical Disease

What are the four stages or lesions that can follow irreversible pulpitis,

• Acute apical periodontitis

• Chronic apical periodontitis (periapical granuloma)

• Periapical abscess

• Radicular cyst