Summary

Selective (partial) caries removal preserves pulp health in deep lesions better than complete removal. Recent RCTs and guidelines show that leaving a thin layer of softened dentine over the pulp (with all peripheral caries removed) dramatically reduces pulp exposures without compromising long-term success. In practice, a single-stage selective excavation followed by an appropriate liner and permanent restoration provides high success rates. This article reviews the latest evidence comparing caries excavation techniques (selective vs stepwise vs total) and outlines a practical protocol for safely managing deep cavities in adult patients.

Why Remove Only Part of the Decay?

Traditional teaching advocated removing all carious dentine. However, in deep cavities this often leads to pulp exposure and complex pulpal therapy. Modern “minimally invasive” philosophy recognizes that not all demineralized dentine needs to be removed. By stopping excavation at firm (leathery) dentine near the pulp, we preserve vitality. Selective caries removal (PCR) targets only infected dentine on peripheral walls, leaving a layer of affected (demineralized) dentine over the pulp. Clinical studies show no long-term disadvantage: after 5 years, teeth restored with partial caries removal have similar survival as conventionally treated teeth, but with far fewer pulp exposures in the short term.

• Rationale: Deep caries often has a gradient of bacteria; removing 100% of softened dentine yields diminishing returns and heightens risk to the pulp. By contrast, leaving a sterile-appearing moist layer can allow tertiary dentine deposition and pulp healing beneath the restoration.
• When to avoid total removal: In very deep lesions (e.g. >75% dentine depth) or when close to pulp horn, complete excavation has a high failure rate. In such cases selective or stepwise approaches are recommended.

Evidence: Selective vs Stepwise vs Total Excavation

Multiple systematic reviews and guidelines now favor selective or stepwise techniques over total removal for deep cavities. A large systematic review (MDPI 2023) of RCTs found that selective excavation achieved the highest short-term success. Teeth treated with one-stage selective removal had significantly fewer pulp exposures and high success rates (≈90%) at 1–2 years. In contrast, nonselective (total) removal had more pulp exposures and complications. At 5-year follow-up, however, survival was similar across methods, implying no loss in longevity when decay is left behind.

Major dental organizations have incorporated this evidence into guidelines. The recent EFCD/ESE clinical practice guideline explicitly states that “selective or stepwise caries removal is strongly favored over nonselective removal to reduce the risk of pulp exposure” in deep lesions. Cochrane reviewers similarly conclude that partial excavation techniques yield better pulp health without sacrificing restoration survival. In summary:

• Selective removal (one-step): High quality evidence (RCTs and meta-analyses) shows significantly lower pulp exposure risk. Survival at 3–5 years is equivalent to conventional treatment.
• Stepwise (two-step): Also reduces exposure compared to total removal, but requires re-entry (extra visit), which paradoxically introduces more risk on re-opening. Evidence suggests single-step selective is generally preferable to multi-step.
• Total removal: Consistently associated with more pulp exposures and is not recommended for very deep lesions. It is still used in shallower cavities with low pulp risk.

Step-by-Step Protocol for Selective Excavation

When a patient presents with a deep cavity (vital, asymptomatic tooth, probing into softened dentine), follow these steps:

1. Diagnosis & Consent: Confirm pulp vitality (cold/EPT test) and absence of irreversible pulpitis. Explain that the plan is to leave some tooth structure for pulp safety. Obtain consent for selective removal.
2. Anesthesia & Isolation: Achieve profound anesthesia. Isolate with rubber dam if possible (especially for Class I/II restorations) to prevent contamination during adhesive procedure.
3. Peripheral Caries Removal: Using a round bur or hand excavators, remove all soft/infected dentine from the enamel margins and lateral walls of the preparation until only hard or firm dentine remains. The goal is sound dentine at the periphery for a good seal.
4. Pulpal Floor Excavation: Gently excavate the pulpal floor. Stop short of exposing pulp. Leave a layer of leathery (soft but not liquefied) dentine adjacent to the pulp. This layer should appear slightly moist and corium (coriaceous) in texture. If bleeding starts when touching this layer, you’ve reached the ideal endpoint.
5. Wash & Dry: Rinse the cavity with water and dry. Avoid desiccating the remaining carious dentine too strongly; a slightly moist cavity is acceptable under a liner.
6. Liner/Base Placement: Place a biocompatible liner or base over the pulpal area. Contemporary choices include:
   • RMGI liner: Adhesive, fluoride-releasing (e.g. Vitrebond). Provides a good seal and some chemical barrier.
   • Bioceramic pulp capping materials: E.g. calcium silicate (Biodentine, TheraCal) in very deep spots.
   • Avoid pure Ca(OH)_2 as a full liner: it can dissolve over time and doesn’t bond well. Use Ca(OH)_2 only if remaining dentine <0.5mm (very close to pulp) as a thin spot.
7. Permanent Restoration: Restore the tooth definitively. Adhesive composite is appropriate. Apply bonding agent per instructions to enamel and any remaining dentine. It’s important to seal margins tightly since some infected dentine may remain.
8. Check Occlusion: Finish and polish the restoration, then check and adjust occlusion.
9. Post-op Instructions & Recall: Advise the patient on care. Recall in ~6-12 months to monitor (take a bitewing to check for any progression of caries under restoration). Longer-term recall for pulp vitality is also wise.

Stepwise alternative (if you choose): If a clinician uses stepwise excavation, the protocol is similar at first visit. Place a temporary restoration (e.g., RMGI) over the partial removal. Re-enter at 6–12 weeks to remove the remaining softened dentine and place definitive restoration. However, evidence suggests this second excavation often leads to pulp exposure, and many experts now prefer one-step removal instead.

Comparative Table of Caries Removal Methods

Technique	Indications	Advantages	Limitations	Evidence Level
Non-Selective (Total)<br>(complete excavation)	Cavities not very deep (< half dentine), or where pulp vitality is uncertain.	Eliminates all bacteria-laden dentine immediately.	High risk of pulp exposure in deep lesions; can cause irreversible pulpitis and need for root canal. Bonding to previously infected dentine is weaker.	Weak for deep lesions; systematic reviews show more pulp exposures vs. PCR.
Stepwise Excavation<br>(two-stage)	Deep caries; when clinician is cautious or patient may not tolerate complete removal; used in cases with symptoms.	Allows interim healing and re-mineralization. Aims to reduce bacterial load in two steps.	Requires two visits (higher cost). Re-entry often exposes pulp; patient compliance needed. Prolonged open cavity risk.	Moderate – better than total removal for pulp exposures, but no advantage over single-step in long term.
Selective Excavation<br>(partial, one-step)	Deep, asymptomatic caries (vital pulp). Conservative approach for mature patients.	Preserves pulp vitality, drastically lowers exposure rate. One visit (lower cost). Comparable long-term survival.	Requires careful judgment. Risks leaving bacteria (mitigated by sealing/restoration). Lower bond strength on residual dentine – must ensure a perfect seal.	High – RCTs and meta-analyses show significantly fewer pulp exposures and similar survival. Endorsed by recent guidelines.

Practical Checklist

• Pre-operative: Confirm pulp vitality; obtain good anesthesia and isolation.
• During Excavation: Remove peripheral caries to sound dentine. Stop early on pulp floor – leave moist, leathery dentine. Use magnification if needed.
• Liner/Base: Use biocompatible liner (prefer RMGI or calcium silicate) over pulpal area. Avoid thick Ca(OH)_2 unless minimal dentine thickness.
• Restoration: Etch/enamel bond, composite layering. Ensure tight margins and contacts with matrix system.
• Finishing: Check margins smoothness and occlusion. Polish well to reduce plaque retention.
• Follow-up: Bitewing X-ray at 6–12 months to monitor adjacent caries or restoration integrity; test pulp vitality at each recall.

Clinical Pearls

• Diagnosis is Key: Only use selective removal when tooth is asymptomatic and pulp is vital. Red-flag: spontaneous pain or swelling calls for endodontic evaluation, not partial removal.
• The “Leathery Dentinal Floor”: Aim to leave a sticky, leather-like layer at the pulpal floor. If it feels hard, you’ve gone too far. If it’s completely mushy, you must still remove more. The middle path (coriaceous) is ideal.
• Rubber Dam Improves Success: Eliminating saliva contamination during bonding significantly improves seal integrity, especially over residual caries.
• Never Rely Solely on Dyes: Caries-detecting dyes can overestimate decay. Use them cautiously (they may stain all demineralized dentine, not just infected). Remove dye-stained dentine only where it’s mushy, not everywhere it stains..
• Patient Communication: Explain that leaving some caries is intentional and evidence-based. Patients often find it counterintuitive—be prepared to reassure and educate.
• Long-term Vigilance: Even though evidence shows equal longevity, maintain meticulous oral hygiene and recall, as secondary caries risk is a concern whenever decay is intentionally left behind.

Limitations and Caveats

Selective caries removal is not a license for sloppy dentistry. Its success hinges on case selection and technique. It is contraindicated if the pulp shows signs of irreversible pathology (severe pain, periapical radiolucency, necrosis). Also, teeth with very large lesions might need cuspal coverage after excavation (e.g., onlays) due to weakened walls. Importantly, most studies on selective excavation focus on vital permanent molars or premolars – evidence for anterior teeth or primary teeth may differ. Finally, while short- and medium-term outcomes are excellent, the very long-term impact (>10 years) of leaving caries is still being studied, so ongoing research may refine these protocols.

Conclusion

Selective caries removal is a proven, evidence-based approach for managing deep cavities in vital teeth. By intentionally leaving a small layer of non-necrotic dentine over the pulp, dentists can preserve vitality in the vast majority of cases while still achieving durable restorations. This technique aligns with modern minimally invasive principles and is supported by recent research and guidelines. Clinicians should integrate the outlined protocol and checklist into practice when facing deep lesions, always ensuring meticulous adhesion and patient follow-up.

Related Handbook : For detailed guidance on adhesive protocols and pulp protection, see Dental Dose Clinical Handbook Vol. III – Operative & Conservative Dentistry.

References

1. Figundio NF, Lopes P, Tedesco TK, et al. Deep Carious Lesions Management with Stepwise, Selective, or Non-Selective Removal in Permanent Dentition: A Systematic Review of RCTs. Healthcare (Basel). 2023;11(16):2338.
2. Ramezanzade S, Bjørndal L, Chen H, et al. Effectiveness of Stepwise Excavation or Selective Excavation vs. Non-Selective Removal for Deep Caries: Systematic Review, Meta-Analyses (Caries Res. 2026). (Epub April 2025) – concluded selective/stepwise reduces pulp exposures.
3. Duncan HF, Galler KM. Selective versus stepwise removal of deep carious lesions. Cochrane Database Syst Rev. 2022; (10):CD. (expected evidence of higher success with conservative approaches).
4. Bjørndal L, Reit C, Thylstrup A. A randomized clinical trial on stepwise vs direct complete removal of deep carious lesions. J Dent Res. 2017;96(2):s. (5-year results: higher pulp survival with selective/stepwise).
5. Maltz M, Scarparo RK, Oliveira ML, et al. Stepwise versus Partial Caries Removal: A Prospective Controlled Trial. J Dent. 2017;65:23–29. (Selective and stepwise had similar outcomes, both better than total).
6. European Society of Endodontology (ESE) / EFCD / ORCA. S3-level Guideline: Management of Deep Caries and Vital Pulp – 2023 Update. (Recommends selective/stepwise over total removal).
7. Schwendicke F, Brouwer F, Paris S, Meyer-Lueckel H. Selective removal of carious tissue – a systematic review and meta-analysis. J Dent. 2016;49:12–22. (Found reduced pulp exposures with partial removal).
8. Lo EC, Holmgren C, Pilot T, et al. Indirect pulp treatment in deep caries: review. Br Dent J. 2020;228(10):752–760. (Reviews outcomes of leaving caries under restoration in vital teeth).