Tooth Cavity Treatment: Filling vs. Extraction Decision Framework

The treatment for a dental cavity (caries lesion) depends on lesion extent, pulpal status, restorability, and patient factors. Extraction is a last resort.

Decision Algorithm

1. Lesion Assessment

• Clinical: Visual-tactile (ICDAS criteria), transillumination
• Radiographic: Bitewing/periapical — enamel, dentin, pulp proximity
• Pulp vitality testing: Cold, EPT — determines pulpal health

2. Treatment by Depth

3. Patient Factors

• Caries risk (high: more aggressive prevention)
• Oral hygiene, diet, fluoride exposure
• Medical status (bisphosphonates, radiation, anticoagulation)
• Financial/insurance constraints
• Strategic value of tooth (arch integrity, occlusion)

Modern Conservative Paradigm

Minimally invasive dentistry: "Drill less, preserve more." Air abrasion, laser, ICON, SDF (silver diamine fluoride) for arrest. Biomimetic materials (bioactive glass, MTA) enhance pulpal healing.

Always seek a second opinion if extraction is recommended for a potentially restorable tooth.

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Depth	Treatment	Prognosis
Enamel only (E1-E2)	Fluoride, sealant, ICON infiltration, monitoring	Non-invasive arrest/remineralization
Outer 1/3 dentin (D1)	Composite restoration (conservative prep)	Excellent; pulp vitality preserved
Middle 1/3 dentin (D2)	Composite ± liner/base (RMGI, CaOH)	Good; monitor for reversible pulpitis
Inner 1/3 dentin / near pulp (D3)	Indirect pulp cap (stepwise) or direct pulp cap (if exposure <1mm, vital)	Variable; 70-90% success with CaOH/MTA
Pulpal involvement (clinical/radiographic)	Root canal therapy + crown	High success if restorable
Unrestorable (<2mm ferrule, vertical fracture, furcation)	Extraction + implant/bridge/partial	Last resort