Etiology and Diagnostics of Pulp Diseases

Classification of Pulpal Disease

1. Soft Tissue Changes

  • Reversible Pulpitis (short, unspontanteous pain → biological pulp treatment)

  • Irreversible Pulpitis (during procedure, bleeding doesn’t stop after 5min; spontaneous, unporvoked pain; night pain → endo)

  • Hyperplastic Pulpitis

  • Pulp Necrosis (no sign of infection or infected necrotic pulp

2. Hard Tissue Changes

  • Pulp Calcification (pulp stones form)

  • Internal Resorption (dentin breakdown within pulp chamber/ root canal)

Definition of Pulpitis

  • Pulpitis: the inflammation of the dental pulp within the tooth.

    • The pulp contains:

    • Blood vessels

    • Nerves

    • Connective tissue inside the tooth (provides nutrients)

Etiological Factors (causes)

A. Physical Factors

1. Mechanical

  • Accidental trauma

  • Iatrogenic dental procedures

  • Fracture of tooth

  • Pathologic wear (attrition, abrasion)

2. Thermal

  • Heat from cavity preparation

  • Heat conduction through deep filling without base

  • Frictional heat during polishing of the filling

3. Electrical

  • Galvanic current from dissimilar metallic fillings

B. Bacterial Factors

  • Invasion of pulp from deep caries

  • Blood-borne microorganisms → pulpal inflammation

  • Infection from periodontal ligament space

C. Chemical Factors

  • Phosphoric acid

  • Silicate cement

  • Self-polymerizing acrylic resin

  • Erosion due to acid

Inflammatory Response

  • pulp reacts to stimuli with an inflammatory response (similar to that other of other connective tissues

  • Key differences include:

    • no excessive swelling of the tissue.

    • no extensive collateral blood supply to the inflamed area.

  • most important: bacterial effects

    • bacteria damages the pulp

      • methods:

      • through toxins

      • directly after caries extends towards pulp

      • transportation via vessels

Classification of Pulp Pathology [AAE (american assoication of endo) ]

  • Normal Pulp “healthy”

  • Reversible Pulpitis

    • no pulp exposure

    • w. accidental pulp exposure

    • w. carious pulp exposure (pulp exposed before caries has been removed)

  • Irreversible Pulpitis

    • w. vital pulp (Symptomatic)

    • w. non-vital pulp (Asymptomatic / slight pain) (asymptomatic doesnt mean that pulp is non-vital but non-vital pulp usually means asymptomatic

  • Pulp Necrosis

  • Previously Treated

  • Previously Initiated Therapy

Criteria for Pulp Normality

  • Histologic Normality

  • Clinical Normality

  • Clinically Normal Pulp:

    • tests: → vital

    • responds to dif. form of excitation

    • no spontaneous symptoms

  • Microscopically Normal Pulp:

    • Free from inflammatory changes of any type

Pulp Response to Injury

  • response occurs quickly when stimuli is mild

  • reactions occur when chemical, mechanical, bacterial irritants attack odontoblasts (Tome’s fibers → excitation of pulp)

  • response depends on character + intensity of stimulus

Clinical Classification of Pulpal Diseases

  1. Healthy Pulp: wo. clinical symptoms

  2. Reversible Pulp Inflammation:

    • Pulp with clinical symptoms, vitality can be preserved with treatment

  3. Irreversible Pulp Inflammation:

    • Pulp with clinical symptoms, vitality cannot be preserved with treatment

  4. Death of the Pulp:

    • Pulp has lost vitality, necrotic, gangrenous

Types of Pulpitis

  • Definition: Inflammation of the dental pulp, which can be acute or chronic.

  • Etiology: cause

    • Dental Caries

    • Traumatic exposure

    • Fracture of the crown

    • Thermal changes

    • Chemical irritation

    • Cracked tooth syndrome

  • acute (reversible / irreversible)

  • chronic (open [hyperplastic] / closed)

1. Reversible Pulpitis

Symptoms

  • pain depependent on impulse

  • Patient can localise the pain

  • Short duration of pain

  • Analgesics can stop the pain

  • Vitality test: short sensation, disappears immediately

  • Pain during percussion is absent

  • Radiographs show caries, fillings near the pulp, and negative periapical findings, tertiary dentine is present

    • tertiary dentine: reactionary dentin. between vital pulp + dentine. produced by odontoblasts as defence mech. in irreversible these r dead so cant form layer

2. Irreversible Pulpitis

Symptoms

  • Spontaneous pain with longer intervals

  • Pain present during the night

  • Analgesics do not alleviate pain

  • Vitality test: rapid, strong pain, prolonged response

  • Pain is difficult to localise (tooth sometimes jaw)

  • Percussion pain may be present if periapical area is inflamed

  • Radiographs show caries, fillings close to the pulp,; absence of tertiary dentine

Reversible Vs. Irreversible Pulpitis

Reversible Pulpitis

  • Mild discomfort with short-duration episodes

  • Infrequent episodes of discomfort

  • Symptoms usually subside after the cause is removed

  • seldom hurts to bite (unless fractured tooth or loose restoration affecting occlusion)

  • if source not removed can → irreversible pulpitis

Irreversible Pulpitis

  • Pain can be absent or present

  • usually history of pain

  • pain often = moderate to severe

  • Usually spontaneous

  • increasing frequency of pain with possible continuous discomfort

  • Requires analgesics

  • pain lingers

  • pain may radiate or is diffuse / localised

Chronic Pulpitis

Etiology

  • Previous acute pulpitis

  • Chronic dental caries

Clinical Features

  • Pain: absent or mild to moderate, dull ache, intermittent

  • reduced reaction to thermal change in comparison to acute pulpitis

  • etiological factor = known

Histopathological Features

  • Mononuclear inflammatory cell infiltration

  • Evidence of fibroblastic activity

  • Minute abscess, if present, localized by granulation tissue

Treatment

  • Root Canal Treatment (RCT)

Chronic Hyperplastic Pulpitis

Etiology

  • Opened cavity

  • May start as chronic or acute

  • Wide apical foramen (observed in children)

Clinical Features (dental pulp overgrowth)

  • Red-pink soft nodule protruding into the cavity

  • Common in children and young adults

  • Relatively insensitive to manipulation; most common in deciduous molars

  • Must be differentiated from gingival polyp

Histopathological Features

  • Polyp consists of granulation tissue, delicate connective tissue, fibers, and blood vessels

  • Mononuclear inflammatory cell infiltration - same as chronic pulpitis

  • covered with stratified squamous epithelium

Treatment

  • RCT or extraction of the tooth

Necrotic Pulp

Distinguishing Features

  • No response to cold or electric pulp testing

  • Decreased sensitivity may arise from insulating effects of additional dentin

  • x-ray: periapical tissues seem normal if necrotic tissue is uninfected

    • when periodontium is involved: symptoms start to arise

  • Single-rooted teeth usually do not respond to sensitivity testing; multi-rooted teeth may show partial vitality → sensitivty test → negative / positive response

Diagnostic Process

Key Factors for Diagnosis

  • Patient's history

    • dental history

      • look at past + present dental history + how reliable the are

      • check if other treatment in the region of interest (probably related to complaint)

    • medical history   

      • allergies (latex [rubber dam, gloves]; bleach [sodium hypochlorite - clean canal (dissolves organic tissue)]; iodine (final disenfectant rinse (no dissolve o.t)])

  • Symptomatology: Analyse symptoms related to pulp health

    • pain = subjective

    • Pain and/or swelling = predominant complaints in endodontic

    • Follow-up queries are necessary to assess:

      • Character of pain

      • Duration

      • Severity

      • Other features of discomfort

    • discomfort often not new but been milder before or temp. stopped

    • patient may not know that treatment is needed / igmores the problem -esp. if symptoms have stopped

  • Clinical Examinations:

    • extraoral exam

      • facial asymmetry, swelling, trismus, + general well-being

      • Assess lymph glands, temporomandibular joint, and muscles of mastication

      • Note the patient's ability to open their mouth, which might impact endodontic treatment access

    • intraoral exam

      • Soft Tissues

        • Assess the condition; scalloping (tongue) or keratosis of buccal mucosa (cheek) indicates parafunctional habits

        • Inspect area of interest for signs like swelling or sinus tracts

      • hard tissues

        • Evaluate the dentition, restorations

        • oral hygiene status, periodontal status, and caries experience for treatment planning

      • specific tooth assesment

        • Detailed assessment of the tooth or teeth in question

          • Evaluate occlusion and compare colour (trauma-related discoloration)

          • Identify possible causes of disease such as caries, fractures, or dentine exposure

          • Assess the restorability of the tooth

  • Knowledge of Pathology of the pulp: Understanding of pulp disease

  • Clinical Experiences:

  • → diagnose reversible or irreversible pulpal disease

Pulp Vitality Testing

  • Pulp Vitality Testing: Assessment of the pulp’s blood supply

  • Pulp Sensibility Testing: Assessment of the pulp’s sensory response

  • Pulp Sensitivity: Condition of the pulp being very responsive to a stimulus

  • Accuracy in descending order: Cold test > Electrical test > Heat test

Techniques for Pulp Testing

  • Thermal Tests: report feeling but should disappear immediately

    • Cold tests (ice, cold spray)

    • Heat tests (warm gutta-percha (most common heat test), Touch and heat tests)

      • gp: coat tooth w lubricant (petroleum jelly), apply heated gp to cervical junction + middle 1/3 of facial surfaces

  • Electric Pulp Test

    • Positive response threshold depends on the probe position and enamel/dentine thickness.

    • The probe is placed near the pulp horn, where nerve density is highest.

    • Devices for electric tests:

      • Pulp Tester (SybronEndo), Vitality Scanner 2006 (SybronEndo), Dat Apex (Dentsply, Maillefer)

    • active (examine tooth) / passive (close circuit) electrode

    • A tingling or warm sensation indicates a healthy pulp; a lingering dull ache indicates irreversible pulpal inflammation.

    • No response suggests that the pulp is necrotic (non-vital).

Test Cavity Preparation

  • last resort when other tests yield inconclusive results.

  • Drilling through the enamel-dentine junction with good isolation under rubber dam. (unaesthetised, high speed round diamond bur)

  • If sensitivity is felt, it may confirm vitality; lack of response suggests non-vitality.

Selective Local Anesthesia

  • Useful when pain is poorly localized or referred.

  • Patients may indicate pain is from a general area but not a specific tooth.

Radiographs in Diagnosis

  • Use paralleling technique for accurate images → avoid geometric distortions.

  • Parallax technique helps in detecting additional root canals and spatial relationships of roots.

Recent Advances in Pulp Vitality Testing

  • Pulse Oximetry

  • Dual Wavelength (Spectrophotometry)

  • Laser Doppler Flowmetry

    • Introduced in dentistry by Gazelius et al. in 1986; is a non-invasive method to measure pulp blood flow.

    • Not routinely used yet due to technological limits; future advances may replace other pulp testing methods.