6- pulp and periradicular pathosis
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Pulp and Periradicular
Pathosis
Sunday
27 April 2014
Dr Amre AtmehBDS, MFDS, MSc(Endodontics), PhD
Normal pulp
Well protected:
- Encapsulation inside harddentine
- Body defence mechanisms
If challenged by irritants(microbial, mechanical,chemical )war(inflammation)
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Microbial Irritants
Bacterial cells, or their products (toxins)
Pulpal response before arrival of bacteria
Direct pulp exposure to bacteriaPMNliquefactionnecrosisbacterial colonizationpulpal inflammation &necrosis
Persistent irritationcontinuous damagespread if necrosisand infectionperiapical pathosis
Damage to the pulp and periradicular tissues is a product ofboth the infection and host response (inflammation)
Microbial Irritants
Pulpal response depends:
1- Virulence of bacteria (strength)
2- Host resistance
3- Ability to reduce intrapulpal pressure (circulation,
lymphatic drainage)
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Mechanical irritants:
Deep cavity preparationpermeable dentine, closer to pulp
Trauma (force, apical foramen)
Deep periodontal curettage (apical BV)
Orthodontic movement (apical BV & nerves,resorption)
Mechanical irritation to PA tissues: Hyperocclusion
Endodontic procedures:- Over-instrumentation, perforation, overextended GP
Chemical irritants
Alcohol, chloroform, hydrogen peroxide
Intra-canal medicaments
Root filling materials
Restorative materials
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Irritants
Transient inflammation
(Reversible)
Irreversible Pulpitis
Total necrosis
Classification of Pulpal Pathosis
Clinical signs & symptoms (not
histopathologic)
1- Normal pulp:
- No symptoms
- Responds normally to
sensitivity tests
- Radiographic no signs of deep
caries or pathosis
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2- Reversible Pulpitis
Mild inflammation of the pulp
Causes: Exposed dentine: Caries, tooth wear, pockets
Symptoms:
- Sharp and transient pain
- Only on stimulation (cold, heat (delayed), sweets, air)
- Asymptomatic
Treatment:
- Remove irritant (caries)
- Close exposed dentine (restoration)
- If irritation persistedmoderate to severe inflammation
3- Irreversible pulpitis
Severe inflammation
Progression of reversible pulpitis
Other causes: Trauma, Orthodontic Tx
Symptoms:- Spontaneous, or stimulated by cold or heat
- lingering, continuous or intermittent- Sharp, dull localized or diffuse
- Asymptomatic
Cold application could relieve pain
Heat application: immediate pain (normally delayed)
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TTP: if inflammation affected the PDL
Radiographicno signs, slight widening in
PDL space
Treatment:
RCT or extraction (non restorable)
3- Irreversible pulpitis
Pulpal calcification(Calcific metamorphesis)
- Hard tissue on dentine walls
- Continuous irritation
- Total obliteration of canals
- Clinically: yellowish teeth, lesssensitivity to stimuli
- Radiographic: no pulp or canal
spaces
- Treatment not required
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Internal resorption
- Inflammation triggers dentinoclasts
resorption
- Asymptomatic
- Normal response to sensitivity tests
- Radiographic: radiolucency with
enlargement of root canal
compartment
- Treatment: Immediate RCT ?
4- Necrotic pulp
Rapid or delayed, total or partial (drainage)
Partial necrosissome parts vital
Liquefaction necrosis (inflammation) or ischemicnecrosis (trauma)
Symptoms:
- Usually asymptomatic
- Spontaneous pain or discomfort
- Pain on pressure (PDL)
- Usually no responce to cold, heat or electrical stimuli
- Could respond to heat (gas expansion)
Treatment: RCT or extraction
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Periradicular Pathosis
PA pathosis can heal unlike
the pulp:
- Collateral blood supply
and lymph drainage
1- Normal Periapical tissues:
- Not sensitive to percussion
or palpation- Radiographic: Normal
lamina dura & PDL structure
Irritants
Pulp necrosis
Irritants to Periapical tissues
Periapical inflammation
Abscess, bone resorption, cyst
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2- Symptomatic (Acute) Apical Periodontitis:
- Irreversible pulpitis or necrosis- Trauma (overinstrumentation, hyperocclusion)
Signs and symptoms:
- Mod to severe spontaneous localized pain
- Pain on biting/ pressure (TTP)
- Radiographic : usually none, occasionally widening in PDL space
Histologic:
- PMNs and macrophages
- Bone and root resorption may be present (not radiographic)
Treatment:
- Occlusal reduction
- Removal of source of irritation (RCT, irrigation)
3- Asymptomatic (Chronic ) apicalperiodontitis
Necrotic pulp, follow SAP
Signs and symptoms:
- Asymptomatic
- PulpNo response to stimuli (necrotic)
- No or slight TTP
- Slight sensitivity to palpation
- Radiographic:
Interruption of lamina dura - periapicalradiolucency.
Histology:
- GranulomaMast and plasma cells,macrophages, lymphocytes
- Radicular cystFluid filled, epitheliallining, surrounded by
granulomatous CT
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4- Condensing Osteitis:
- Pulpitis or necrosis
- Increase in trabicular bone
- Radiographic:
Diffuse concentric
arrangements of
radiopacity
Necrotic pulp
Signs and symptoms:
- Acuterapid onset and spontaneous pain
- Swelling: with (diffuse) or without (localised)
- Painful to percussion and palpation
- Systemic manifestations
Radiographic: no change- apical radiolucency
Histological:
- Liquefaction necrosis: purulant exudate, PMNs, debris surroundedby granulomatous tissue
5- Acute Apical Abscess:
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6- chronic Apical Abscess:
- long standing lesion drainingthrough a sinus tract
- Necrotic pulp with chronic apicalperiodontitis
Signs & symptoms:
- Asymptomatic (drainage)
Histologically & radiographically:- Similar to AAP, but with a sinustract
Postoperative healing
Repair after removing source of irritation:
- Inflammatory responses decrease
- Tissue forming cells increses
- Tissue maturation and organization
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Nonendodontic periradicular pathosis
Pulp sensitivity testmost important
Other causes for PA radiolucencies:
- Anatomical variations (fossae, foramina,
bone marrow pattern)
- Nonendodontic pathosis: cysts, granuloma,
neoplasms
DONE . ANY QUESTIONS ??
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