PULP & PERIAPICAL PATHOSIS

PULP & PERIAPICAL PATHOSIS

INTRODUCTION Inflammation of pulp and periapical tissue is one of the most common diseases encountered in our day to day practice. To give proper and effective treatment one has to diagnose correctly. Arriving at a correct diagnosis requires knowledge, skill, art and experience; knowledge of the diseases and their symptoms, skill to apply proper test procedures, the art to correlate the facts and experiences to reach proper conclusions.

PULPAL PATHOSIS “ The pulp lives for the dentin and the dentin lives by the grace of the pulp. Few marriages in nature are marked by a greater affinity.” - Alfred L. Ogilvie

ETIOLOGY OF PULPAL DISEASES
According to Ingle, I. BACTERIAL a) CORONAL INGRESS 1. Caries 2. Fracture 3. Non fracture trauma 4. Developmental Anomalies b) RADICULAR INGRESS 2. Retrogenic infection – periodontal pocket & abscess 3. Hematogenic

2. TRAUMATIC a) ACUTE 1. Coronal fracture 2. Radicular fracture 3
2. TRAUMATIC a) ACUTE 1. Coronal fracture 2. Radicular fracture 3. Vascular stasis 4. Luxation 5. Avulsion b) CHRONIC 1. Adolescent female bruxism 2. Traumatism 3. Attrition or abrasion 4. Erosion

3. IATROGENIC Cavity preparation Restorations Periodontal curettage Orthodontic movement Electrosurgery Laser burn Rinoplasty Osteotomy

4. CHEMICAL Restorative materials Disinfectants Desiccants 5. IDIOPATHIC Aging. Internal resorption. External resorption. Sickle cell anaemia. Herpes zoster infection. HIV Endodontics 5th edition John I. Ingle

According to Grossman PHYSICAL a) MECHANICAL a) Trauma
b) Pathological wear c) Cracked tooth syndrome d) Barometric changes b) THERMAL a) Heat from cavity preparation b) Exothermic heat from the setting of cement c) Conduction of temperature through deep fillings d) Frictional heat caused by polishing of restoration

c) ELECTRICAL a) Galvanic Current CHEMICAL a) Phosphoric acid, acrylic monomer b) erosion BACTERIAL a) Toxins associated with caries b) Direct invasion of pulp from caries or trauma c) Anachoreses

PULPAL PATHOPHYSIOLOGY
irritation to clinical crown localized pulpal inflammation increased local tissue pressure initial insult localized effect venous collapse stasis ischemia local necrosis release of intracellular inflammatory agents Circumferential vascular disturbance Increased tissue pressure Necrosis of additional tissue Mechanism Of spread Total pulpitis

CLASSIFICATION OF PULPAL DISEASES
According to Grossman I] PULPITIS a) REVERSIBLE 1. Acute (symptomatic) 2. Chronic (asymptomatic) b) IRREVERSIBLE 1. Acute - Abnormally responsive to cold - Abnormally responsive to heat 2. Chronic - Asymptomatic with pulp exposure - Hyperplastic pulpitis - Internal resorption

II] PULP DEGENERATION Calcific (Radiographic diagnosis) Others (Histopathologic diagnosis) III] PULP NECROSIS

According to Cohen: Reversible pulpitis Irreversible pulpitis
Asymptomatic Irreversible pulpitis Symptomatic irreversible Hyperplastic pulpitis Internal resorption Pulp necrosis

According toWeine A) INFLAMMATORY CHANGES HYPERALGIA Hypersensitive dentin. Hyperemia. PAINFUL PULPITIS Acute pulpalgia (acute pulpitis) Chronic pulpalgia (subacute pulpitis) NON PAINFUL PULPITIS Cronic Ulcerative Pulpitis Chronic Pulpitis Hyperplastic pulpitis.

B) ADDITIONAL PULP CHANGES
Necrosis Retrogressive changes Internal Resorption

According to SELTZER (HISTOLOGIC CLASSIFICATION)
Intact - uninflammed pulp Atrophic pulp Acute pulpitis Intact pulp with scattered chronic inflammatory cells (transitional stage) Chronic partial pulpitis - with partial liqufeaction necrosis -with partial coagulation necrosis Chronic total pulpitis Total pulp necrosis

ACCORDING TO F.J. HARTY A simple classification based on the state of the pulp. Normal pulp. Reversible pulpitis. Irreversible pulpitis. Pulp necrosis.

SHAFER’S Classification
1.According to involvement a) Partial b) Total 2. According to severity a) Acute b) Chronic 3. According to presence or absence of direct communication between the dental pulp and oral environment a) Pulpitis aperta b) Pulpitis Clausa

REVERSIBLE PULPITIS A mild to moderate inflammatory condition of pulp caused by noxious stimuli in which pulp is capable of returning to the uninflamed state following removal of the stimuli. Also, referred as “PULP HYPERAEMIA”.

ETIOLOGY Trauma Thermal shock Excessive dehydration Galvanism
Chemical stimulus Bacteria Circulatory disturbances Local vascular congestion

Symptoms Sharp pain lasting for a moment More often brought on by cold than hot food Does not occur spontaneously Does not continue when stimulus has been removed Teeth are not tender on percussion Histopathology Hyperaemia - mild to moderate inflammatory changes are limited to the area of involved dentinal tubules Reparative dentin, dilated blood vessels, disruption of odontoblast layer Extravasation of edema fluid Immunologically competent chronic inflammatory cells Presence of acute inflammatory cells

DIAGNOSIS 1. Pain: Sharp pain, lasts for a few seconds
Cold, sweet or sour causes pain 2. Visual examination & history: Examine for caries, restorations, fractures or traumatic occlusion History of past dental treatment 3. Clinical tests: Cold test is excellent way to locate pain Normal to percussion, palpation and mobility 4. Radiographically : No changes 5. Vitality test: More readily response to cold stimulation than normal teeth EPT requires minimal current to initiate positive response

Treatment Prevention Removal of the noxious stimuli Check for vitality Periodic care to prevent caries Proper insulation of the restoration Desensitization Prognosis Good - if irritant is removed earlier Otherwise condition may develop to Irreversible pulpitis

IRREVERSIBLE PULPITIS
A persistent inflammatory condition of the pulp, symptomatic or asymptomatic, caused by noxious stimulus. May be Acute or chronic ETIOLOGY Caries Chemical, thermal and mechanical injuries Sequelae of reversible pulpitis

Both acute and chronic inflammatory stages are seen
HISTOPATHOLOGY Both acute and chronic inflammatory stages are seen Chronic inflammatory response dentin Caries not removed inflammatory changes will increase in severity Post capillary venules become congested Acute Inflammatory reaction Attract PMNL’s Affect circulation - Necrosis PMNL ‘s Die & release lysosomal enzymes lysis Phagocytosis by PMNL ‘s Chronic ulcerative pulpitis Carious process continues microabscess pus

SYMPTOMS OF IRREVERSIBLE PULPITIS
Early stages – Pain can be spontaneous in nature which is sharp, piercing, intermittent or continuous in nature. Pain exacerbated on bending down or lying down Presence of referred pain Later stages  Pain is more severe, boring, throbbing in nature.

Diagnosis Deep cavity extending to the pulp. Decay under filling. Greyish scum like layer. An odor of decomposition. Probing into the area is not painful. Deep probing will result in pain & haemorrhage.

History- -May reveal previous symptoms or a traumatic experience Radiographic examination: -May not show anything of significance. -It may disclose an interproximal cavity or caries under a filling Percussion: -Tenderness

Vitality test: Thermal test: Electric test: Treatment:
As pulpal inflammation progresses, heat will intensify the responses. Cold will tend to relieve the pain in advanced stages of pulpits. Electric test: Early stages – response to less current. Later (Necrotic tissue)- more current is required. Treatment: Pulpectomy. Surgical removal should be considered if the tooth is unrestorable.

POTENTIALLY REVERSIBLE PROBABLY IRREVERSIBLE
Pain Sharp, Momentary : dissipates readily after removal of stimulus Continuous, throbbing : Persists minutes to hours Stimulus Requires external stimulus (cold, heat, sweet) Spontaneous : dead or injured tissue in chambers or canal. Intermittent : Spontaneous pain of short duration. History Recent dental procedure, cervical abrasion Extensive restoration, pulp capping, deep caries, trauma Electric test Premature response Premature, delayed or mixed response Referred pain Negative Common Lying down Increases pain Color May be present due to tissue lysis & intrapulpal haemorrhage. Radiograph Restoration ,caries, periodontal pocket, cupping of alveolar crest Deep restoration, caries Periapex - Normal Periapex – widening of PDL Endodontic Therapy Franklin S. Wein 6th edition

CHRONIC HYPERPLASTIC PULPITIS (Pulp Polyp)
Chronic hyperplastic pulpitis is a productive pulpal inflammation due to an extensive carious exposure of a young pulp. Characterized by - development of granulation tissue, covered at times with epithelium and resulting from long standing, low grade irritation.

ETIOLOGY Slow, progressive carious exposure. Pulp polyp develops in a tooth with large, open cavity having a young resistant pulp & a chronic low grade stimulus Mechanical irritation & bacterial infection provide stimulus. Symptoms It is asymptomatic, except during mastication.

HISTOPATHOLOGY Budding capillaries, proliferating fibroblasts & inflammatory cells are seen. Presence of granulation tissue – which is young vascular connective tissue containing PMNL’s, lymphocytes & plasma cells. Collagenous fibres -rooted in deeper tissue of pulp chamber. Sensory nerve fibres are almost absent near surface. Surface is usually covered by stratified squamous epithelium.

DIAGNOSIS - Appearance of polyp tissue clinically, characteristic of a fleshy, reddish, pulpal mass which fills most of pulp chamber. - Radiographically- a large open cavity with direct access to the pulp chamber. Thermal tests- Feeble or no response - EPT : More current than normal may be required to elicit a response Differential Diagnosis - Proliferating gingival tissue (Gingival Polyp)

TREATMENT Elimination of polyp tissue with a sharp curette or spoon excavator, followed by extirpation of the pulp, provided the tooth can be restored. Bleeding can be controlled with pressure. pulpectomy can be completed in a single visit.

Exacerbation – additional operative procedures
CHRONIC PULPITIS (CLOSED FORM) Occur from operative procedures, trauma or periodontal lesions extending apically to the foramina of lateral canals Excessive orthodontic movement may affect the vascular supply to the pulp producing localized areas of necrosis Depending on the strength and duration of the inciting irritant, pulpitis may be chronic from onset or become chronic after the acute responses have subsided Exacerbation – additional operative procedures Minimal pulpal damage – resolution may occur

CHRONIC PULPITIS (ULCERATIVE OR OPEN FORM)
Is a chronic inflammation of the cariously exposed pulp characterized by the formation of an abscess at the point of exposure (ulcer). Terms used are - Pulpal chronic abscess or pulpal granuloma. The abscess is surrounded by granulomatous tissue Can be partial or total.

INTERNAL RESORPTION An idiopathic, slow or fast progressive resorptive process occurring in dentin of the pulp chamber or root canals of teeth. Synonyms: Internal granuloma, Odontoclastoma, Pink tooth of mummary ETIOLOGY: Unknown, but patient often has a history of trauma. TYPES- ( James L. Gutmann 1999) Root canal replacement resorption (Metaplastic resorption) Internal inflammatory resorption (Quintessence Int ,1999 :vol 30)

Pulp inflammation due to infection
MECHANISM OF INTERNAL RESORPTION Pulp inflammation due to infection Alteration or loss of pre- dentin and odontoblastic layer Undifferentiated mesenchymal cells come in contact with mineralized dentin Differentiate into dentinoclasts Resorption results

Resorptive lacunae may be filled in by osteoid tissues
SYMPTOMS - Asymptomatic. - In the crown, it is manifested as a reddish area called “pink spot” representing the granulation tissue showing through the resorbed area of crown. HISTOPATHOLOGY: Shows Osteoclastic activity. Resorptive lacunae may be filled in by osteoid tissues Presence of granulation tissue, multinucleated giant cells ,dentinoclasts, chronic inflammatory cells. Metaplasia of pulp i.e. transformation to another tissue

DIAGNOSIS - Recognized during routine radiographic examination - Affects either crown or root or both. - It is slow & progressive or develops rapidly to perforate the tooth . - Most commonly involved - maxillary anterior teeth. RADIOGRAPHICALLY - Pulp chamber / root canal with a round or ovoid radiolucent area. DIFFERENTIAL DIAGNOSIS - External resorption

TREATMENT - Extirpation of pulp, stops the internal resorptive process. - Routine endodontic treatment is indicated, but in advanced cases -calcium hydroxide paste dressing - Repair is completed when calcific barrier is present. - Later the canal with its defect is obturated with plasticized gutta percha. PROGNOSIS Is favourable, before perforation occurs.

May occur in the following forms
RETROGRESSIVE PULP CHANGES (PULP DEGENERATION) Pulp degeneration is induced by attrition, abrasion, trauma, operative procedures, caries, pulp capping and reversible pulpitis. Generally present in older people . May occur in the following forms Atrophy Fibrosis Calcifications

ATROPHIC DEGENERATION
- Is observed histopathologically in pulps of older people. - Fewer stellate cells are present - Intercellular fluid is increased. - Pulp tissue is less sensitive than normal. - No clinical diagnosis exists. FIBROUS DEGENERATION - Is characterized by replacement of cellular elements by fibrous connective tissue. - Pulp has a characteristic appearance of a leathery fibre. - Reduction in size of pulp chamber. - Decrease in nerve supply or blood supply. - There are no distinguishing symptoms.

CALCIFICATIONS Here a part of pulp tissue is replaced by calcific material, i.e. pulp stones or denticles are formed, either within pulp chamber or root canal. 3 types -Dystrophic, Diffuse, Denticles / pulp stones DYSTROPHIC CALCIFICATIONS Occur by deposition of calcium salts in dead or degenerated tissue Occur in minute areas of young pulp affected by minor circulatory disturbances, in blood clot or around a single degenerated cell. It can also begin in the connective tissue walls of blood vessels and nerves and follow their course

DIFFUSE CALCIFICATIONS
Generally observed in root canals The deposits become long, thin and fibrillar on fusing

DENTICLES / PULP STONES
True denticles are composed of dentin and formed by detached dentinoblasts or fragments of Hertwig’s sheath which may stimulate undifferentiated cells to assume dentinoblastic activity. False denticles are formed when a degenerating tissue structure serves as a nidus for deposition of concentric layers of calcified tissue Pulp stones are considered harmless, although referred pain in few patients has been reported.

DENTICLES size location structure free true false Local diffused attached embedded

NECROSIS OF PULP Necrosis or death of the pulp tissue is a sequela of acute and chronic inflammation of the pulp or an immediate arrest of circulation by traumatic injury . - It may be partial or total. ETIOLOGY As a Sequelae to inflammation 2) Bacteria, trauma and chemical irritation.: causing an ischaemic infarction & resulting in dry gangrenous necrotic pulp.

TWO TYPES LIQUEFACTION NECROSIS COAGULATION NECROSIS
Tissue converted into softened mass Good blood supply. Inflammatory exudate. COAGULATION NECROSIS Tissue converted into solid mass Less blood supply to the area. Cheesy consistency.

SYMPTOMS : - No painful symptoms. - Discolouration of tooth is first indication that pulp is dead. - Dull or opaque appearance of the crown – lack of normal translucency - Grayish or brownish discoloration may cause tooth to lack its usual brilliance and luster HISTOPATHOLOGY - Necrotic pulp tissue, cellular debris and microorganisms are seen - Periapical tissue may be normal or slight evidence of inflammation of apical PDL

POISONOUS INTERMEDIATE & END PRODUCTS
FOUND IN NECROSIS 1. Intermediate proteolytic products that emit foul odour a. Indole and Skatole b. Putriscine and Cadaverine c. Indican 2. End products Hydrogen sulphide, ammonia, water, carbon dioxide & fatty acids 3. Exotoxins 4. Endotoxins 5. Foreign bacterial protein

DIAGNOSIS Pain is absent with total necrosis Swelling negative Mobility negative Tenderness to percusion - negative Radiographic findings are normal except if there is apical periodontitis. No response to vitality tests. Sometimes positive electric test as result of liquefaction necrosis. Discoloration - as result of haemolysis of RBC s or decomposition of pulp tissue (grey/ brown) TREATMENT - Root Canal Therapy

PERIAPICAL LESIONS As a consequence of pathologic changes in dental pulp, the root canal can harbor numerous irritants. Egress of these irritants into the periapical tissues can initiate periradicular lesions. Depending on the nature and quality of these irritants as well as the duration of exposure of the periradicular tissues, a variety of tissue changes can occur.

INTERRELATIONSHIPS OF PERIAPICAL INFECTION
Pulpitis Acute chronic Apical perodontitis acute chronic Periapical Abscess Periapical Granuloma acute chronic Periodontal cyst Osteomyelitis acute chronic focal diffuse Periostitis Cellulitis Abscess

CLASSIFICATION 1 ) ACUTE PERIRADICULAR DISEASES According to GROSSMAN
Acute alveolar abscess Acute apical periodontitis - Vital - Nonvital 2) CHRONIC PERIRADICULAR DISEASES WITH AREAS OF RAREFACTION Chronic alveolar abscess Granuloma Cyst 3) CONDENSING OSTEITIS 4) EXTERNAL ROOT RESORPTION 5) DISEASES OF PERIRADICULAR TISSUES OF NONENDODONTIC ORIGIN

INGLE’S CLASSIFICATION
Based on the clinical signs and symptoms, as well as radiographic findings Three main clinical groups Symptomatic apical periodontitis Asymptomatic apical periodontitis Apical abscess

WEINE’S CLASSIFICATION
PULPOPERIAPICAL DISEASE: 1] PAINFUL PULPOPERIAPICAL PATHOSES a) Incipient acute periapical periodontitis b) Advanced acute periapical periodontitis i. Acute periapical abscess ii. Recrudescent abscess iii. Subacute periapical abscess 2] NON PAINFUL PULPOPERIAPICAL PATHOSES a) Pulpoperiapical osteosclerosis b) Incipient chronic periapical periodontitis c) Advanced chronic periapical periodontitis i. Periapical granuloma ii. Chronic periapical abscess iii. Periapical cyst

WHO (1995) Classification:
K Acute apical periodontitis K Chronic apical periodontitis (Apical granuloma) K Periapical abscess with sinus K Periapical abscess with sinus to maxillary antrum K Periapical abscess with sinus to nasal cavity K Periapical abscess with sinus to oral cavity K Periapical abscess with sinus to skin K Periapical abscess without sinus K Radicular cyst (Apical periodontal cyst, Periapical cyst) K Apical and lateral cyst K Residual cyst K Inflammatory paradental cyst

ACUTE ALVEOLAR ABSCESS
(Synonyms: Acute periapical abscess, Acute dentoalveolar abscess ) Definition Localised collection of pus in the alveolar bone at the root apex of tooth following death of pulp, with extension of infection through apical foramen into periradicular tissues. Etiology Bacterial invasion , trauma, chemical or mechanical irritation.

HISTOPATHOLOGY PMN’S infiltration Accumulation of inflammatory exudates Distention of PDL Prosses continues, PDL separates Mobile tooth Bone resorption at apex Liquefaction necrosis containing PMN’S ,debris, cell remnants & purulent exudates

SYMPTOMS First symptom - tenderness
Later - patient has severe throbbing pain with swelling of the overlying soft tissue As the infection progresses, swelling becomes more pronounced and extends beyond the original site Tooth becomes more painful, elongated and mobile If untreated - progresses to osteitis, periostitis, cellulitis or osteomyelitis Sinus tract - opens to buccal mucosa

When Maxillary anterior teeth - swelling of upper lip and chin (extend both eyelids)
When Maxillary posterior teeth - the Cheek may swell. Mandibular posterior teeth- swelling extends around border of jaw into submaxillary region or ear.

Gutta-percha is placed in the sinus tract - points to involved tooth:
SINUS TRACT TRACING General Systemic reaction is seen ( Septic products) Patient appears - Pale, Irritable & Weakened from pain and loss of sleep

DIAGNOSIS Early stage - difficult to locate tooth. Once infection progresses to process of periodontitis & extrusion, a radiographic evaluation shows thickening of periodontal ligament space & breakdown of bone Electric test & thermal tests: No response Tooth is tender on percussion Apical mucosa is tender on palpation Tooth may be mobile & extruded. DIFFERENTIAL DIAGNOSIS Periodontal abscess & Irreversible pulpitis

Treatment: Establish drainage & control systemic infection
Treatment: Establish drainage & control systemic infection. ON FIRST VISIT : Tooth is left open for drainage. Thorough instrumentation & irrigation before medicating and sealing. Once the swelling and pain subsides endodontic treatment is done. If diffuse swelling : Antibiotic coverage is prescribed along with hot mouth rinse, Once area is localised, incision and drainage is instituted

ACUTE APICAL PERIODONTITIS
A painful inflammation of periodontium as a result of trauma, irritation or infection through root canal regardless of pulp is vital or non-vital. HISTOPATHOLOGIC CLASSIFICATION: (P.N.R Nair) 1) Acute apical periodontitis ( PMN’s) : Primary & secondary 2) Chronic apical periodontitis ( Lymphocytes, macrophages, plasma cells) 3) Cystic apical periodontitis - True cyst, Pocket cyst (bay cyst)

APICAL PERIODONTITIS:

ETIOLOGY Occlusal trauma Wedging of foreign object between teeth Non-vital tooth as a sequelae to pulpal dieseases. Iatrogenic: during over instrumentation & extrusion of irritating medicaments Perforation of root SYMPTOMS - Pain and tenderness - Tooth may be slightly sore, when percussed. HISTOPATHOLOGY Inflammatory reaction in apical periodontal ligament Blood vessels are dilated, PMNL’s are present Cholestrol clefts are the commom finding. Accumulation of serous exudate distends the periodontal ligament Osteoclasts are seen.

DIAGNOSIS Tooth is tender to percussion Symptoms are due to Overinstrumentation, Irritating medicament or Overfilling Radiographically: thickened periodontal ligament or small area of rarefaction TREATMENT Endodontic therapy Postoperative pain is controlled analgesics & antibiotics Hyper-occlusion relieve the occlusion.

ACUTE EXACERBATION OF A CHRONIC LESION
(PHOENIX ABSCESS) An acute inflammatory reaction superimposed on an existing chronic lesion, such as a cyst or granuloma ETIOLOGY 1. Noxious stimuli from a diseased pulp with chronic periradicular disease. 2. Because of influx of necrotic products or bacteria and their toxins, the dormant lesions may become reactive & cause an acute inflammatory response. 3. Lowering of the body's defenses in the presence of bacteria - may also trigger an acute inflammatory response. 4. Mechanical irritation during root canal instrumentation SYMPTOMS Tooth - tender to touch & elevated in its socket Mucosa - sensitive to palpation & appears red & swollen

HISTOPATHOLOGY : Liquefaction necrosis with disintegrating PMNL & cellular debris (pus), surrounded by infiltration of macrophages, lymphocytes & plasma cells DIAGNOSIS History of patient vitality tests Lack of response RADIOGRAPHICALLY :- Large area of radiolucency at the apex.

DIFFERENTIAL DIAGNOSIS :
Acute alveolar abscess, Acute irreversible pulpitis TREATMENT Establishment of drainage Once symptoms subside - RCT

CHRONIC ALVEOLAR ABSCESS (Chronic Suppurative Apical Periodontitis)
DEFINITION A chronic alveolar abscess is a long-standing, low-grade infection of the periradicular alveolar bone. ETIOLOGY 1. Death of the pulp with extension of the infective process periapically 2. A pre-existing acute abscess

SIGNS & SYMPTOMS Asymptomatic - Detected either by the presence
of sinus tract or on routine radiograph. - If the sinus tract drainage becomes blocked – pain & swelling - Range of sensitivity to percussion & palpation – depends on the sinus tract is open, draining or closed . A radiograph with a gutta-percha cone into the sinus tract often shows involved tooth by tracing the sinus tract to its origin.

RADIOGRAPHICALLY DIAGNOSIS
Chronic abscess may be painless or mildly painful. First sign - osseous breakdown (radiographically) seen during routine examination. Patient may give the history of sudden sharp pain which subsided & has not reoccurred. Clinically -A large carious exposure, composite, acrylic or metallic restoration or discolouration of crown of tooth. RADIOGRAPHICALLY A diffuse area of bone rarefaction Periodontal ligament is thickened. Vitality tests – Negative

HISTOPATHOLOGY Periodontal fibers at root apex are detached / lost. Apical cementum may be affected. Lymphocytes , plasma cells at the periphery & PMNL’s at the center Fibroblasts - form a capsule at periphery. TREATMENT Endodontic thearpy. The sinus tract ultimately heals by granulation When sinus tract does not heal while the tooth is under endodontic treatment, it is curetted with a small spoon excavator.

PERIAPICAL GRANULOMA A growth of granulomatous tissue continuous with the periodontal ligament resulting from death of pulp & diffusion of bacteria and bacterial toxins from root canal into the surrounding periradicular tissues through apical and lateral foramina. ETIOLOGY Sequelae of pulpitis

CLINICAL FEATURES Mild pain / Sensitive to percussion Tooth slightly elongated Sinus tract – may or may not present Vitality test –negative History of subsided pulpalgia Mucosa- May or may not be tender to palpation No mobility DIAGNOSIS RADIOGRAPHICALLY: Well defined radiolucency, with lack of continuity of the lamina dura. Diameter – Varies from a fraction of a millimeter to a centimeter or even larger.

ZONES OF A WELL-ESTABLISHED GRANULOMA (FISH’S ZONES)

KRONFELD’S MOUNTAIN PASS CONCEPT
Granuloma is not an environment in which bacteria live but one in which they are destroyed. Bacteria (zone I) – compares bacteria in the root canals with an army entrenched behind high and inaccessible mountains Foramina : Mountain passes. Granulomatous (proliferative) tissue : mobilized army defending plains (periapex) from invaders. Major battle (b/w invaders + WBC’s) - acute inflammation (zone II) Local destruction created by battle is repaired (granulation tissue - zone III) and the environment returns to the normal pattern.

HISTOPATHOLOGY Granulomatous tissue replaces alveolar bone & periodontal ligament. Consists of - rich vascular network, fibroblasts, lymphocytes , plasma cells,PMN’S & fibrous capsule. Macrophages & giant cells. Macrophages containing lipid material & cholesterol Alveolar bone shows resorption (osteoclasts). Epithelium derived from cell rests of Malassez . TREATMENT Root canal treatment / surgery

RADICULAR CYST Is a slowly growing epithelial sac at the apex of a tooth that lines a pathologic cavity in the alveolar bone. The lumen contains a low-concentration of proteinaceous fluid. ETIOLOGY Physical, chemical or bacterial injury (death of pulp), followed by stimulation of epithelial cell rests of Malassez. SYMPTOMS: No symptoms, except those seen in necrosis of pulp. A cyst may become large enough, to be obvious as a swelling. Teeth are mobile. Left untreated - continues to grow at expense of maxilla or mandible.

FORMATION OF RADICULAR CYST
Caries / trauma Death of dental pulp Inflammation in apical area of bone Periapical granuloma formation Stimulation of epithelial rests of malassez Proliferation of epithelium Periapical cyst formation

DIAGNOSIS Location : Common in maxillary / males/ 3rd decade Electrical or Thermal tests – no response Radiographically - Loss of continuity of lamina dura with an area of rarefaction . Radiolucent area - round in outline except where it approximates adjacent teeth it may be flattened & oval shaped. Larger than granuloma & may include more than one tooth Electrophoretic analysis( polyacrylamide gel) : Intense albumin pattern in cysts

HISTOPATHOLOGY: Cavity lined by stratified squamous epithelium. Connective tissue is infiltrated by lymphocytes, plasma cells, PMNL,cholesterol clefts, macrophages, & giant cells. Cystic cavity contains cellular debris and pale eosinophilic fluid. According to PNR Nair, two types of radicular cysts: (1) Those containing cavities completely enclosed in epithelial lining- true cyst & (2) Those containing epithelium-lined cavities that are open to the root canals - periapical pocket cysts (bay cyst) DIFFERENTIAL DIAGNOSIS Periapical granuloma , Globulomaxillary cyst.

TRUE CYST POCKET CYST

TREATMENT True cyst : Root canal treatment of the affected tooth, together with surgical enucleation may be attempted. Pocket cyst : Conventional RCT, followed by periodic observation.

CHRONIC PERIRADICULAR DISEASE WITH AREA OF CONDENSATION
CONDENSING OSTEITIS Condensing osteitis is the response to a low-grade, chronic inflammation of periradicular area as a result of a mild irritation through the root canal. Characterized as a localized overproduction of apical bone. ETIOLOGY Mild irritation from pulpal disease - stimulates osteoblastic activity SYMPTOMS Usually asymptomatic , discovered during routine radiographic examination.

DIAGNOSIS Radiographically: a well-circumscribed radioopaque area
surrounding the affected teeth. Mandibular posterior teeth - frequently affected. Tooth may or may not respond to electrical and thermal stimuli HISTOPATHOLOGY An area of dense bone with trabecular borders lined with osteoblasts Chronic inflammatory cells, plasma cells and lymphocytes are also seen in the scant bone marrow. TREATMENT Endodontic treatment.

CLASSIFICATION (BY JAMES L. GUTMANN ET AL IN 1999)
EXTERNAL RESORPTION CLASSIFICATION (BY JAMES L. GUTMANN ET AL IN 1999) 1. External surface resorption 2. External inflammatory root resorption 3. Dentoalveolar ankylosis 4. Replacement resorption EXTERNAL SURFACE RESORPTION Spontaneous destruction & repair of root surface It is a normal physiologic response to minor injuries Mechanical damage to the cementum –Localized area of resorption - Repair Complete periodontal healing & root surface healing in 14 days Symptomless, cannot be detected in routine radiographs Does not require any treatment. QI vol 30: (1), 1999.

2) EXTERNAL INFLAMMATORY ROOT RESORPTION
Injury or irritation to periodontal tissues where inflammation is beyond repair. ETIOLOGY Trauma Orthodontic tooth movement - excessive forces. Trauma from occlusion Periodontal pathology Avulsion & Luxation injuries CLINICAL FEATURES H/o trauma Necrotic pulp / irreversible pulpitis Tooth mobility Percussion sensitivity If resorption communicates with gingival sulcus- leads to pocket formation

RADIOGRAPHIC FEATURES
Bowl like radiolucency with ragged irregular area on the root surface and loss of tooth structure and alveolar bone. TREATMENT Endodontic treatment with calcium hydroxide intracanal medication.

3) DENTOALVEOLAR ANKYLOSIS
Union of tooth & bone with no intervening periodontal ligament & connective tissue ETIOLOGY Trauma, Intrusive luxation, Reimplantation of avulsed tooth (damage to PL cells & cementum) CLINICAL FEATURES Lack of mobility , Lack of mesial drift Dull metallic sound on percussion Infraocclusion

RADIOGRAPHIC FEATURES
Moth eaten appearance with irregular border Absence of periodontal ligament & lamina dura TREATMENT OF ANKYLOSIS No treatment Gradual loss of tooth – finally gets mobile & exfoliates 4) REPLACEMENT RESORPTION Similar to ankylosis, but there is the presence of an intervening inflamed connective tissue.

NONENDODONTIC PERIRADICULAR LESIONS
ODONTOGENIC CYSTS Dentigerous cyst Lateral periodontal cyst Odontogenic keratocyst Residual apical cyst NON- ODONTOGENIC LESIONS Central giant cell granuloma Nasopalatine duct cyst Simple bone cyst Globulomaxillary cyst Enostosis

BONY PATHOLOGY ODONTOGENIC TUMOURS Fibro-osseous lesions
Osteoblastoma & cementoma Cementifying & ossifying fibroma ODONTOGENIC TUMOURS Ameloblastoma MALIGNANCIES Sarcoma Carcinoma

Conclusion: Periapical shadows are the daily bread of the general dentist. The clinician should possess a thorough working knowledge and skill necessary to establish a suitable working diagnosis in each case. It requires practice to gain skill and so the clinician must approach each periapical shadow in a logical fashion and follow it through, step by step, until the end point is reached.

References: 1.Endodontics (4th & 5th edition) – John I. Ingle
2.Pathways of pulp (9th edition)- S Cohen and Burns 3.Shafers - A text book of oral pathology (4th edition) 4.Endodontic Practice (11th Edition) – Louis I. Grossman 5.Endodontic Therapy (4th & 5th edition) – Franklin S. Weine 6.Endodontics in clinical practice (4rd edition) – F.J. Harty 7.Endodontics (3rd edition) – K Gulabivala

8. Colour atlas & Text of Endodontics (2nd edition) –
Christopher J K Stock Problem solving in Endodontics – James L Gutman The Dental pulp (3rd edition) – Seltzer Oral & Maxillofacial Pathology- Brad W Neville

HANK YOU

PULP & PERIAPICAL PATHOSIS

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