Pits and Fissure Sealants: Indications, Materials, and Step-by-Step Clinical Technique

Pits and fissure sealants are physical barriers applied to the occlusal surfaces of teeth to seal susceptible pits and fissures and limit the accumulation and activity of cariogenic biofilm within these protected areas. They reflect the transition in preventive dentistry from the traditional concept of “extension for prevention” toward minimally invasive, evidence-based caries management.

Sealants are particularly relevant because occlusal pits and fissures are highly susceptible to caries due to their complex anatomy and tendency to retain plaque and food debris. Effectively penetrating and sealing these areas can help prevent caries and, in selected noncavitated lesions, inhibit lesion progression.

This guide explains when and why pits and fissure sealants are indicated, how to distinguish a stained fissure from a noncavitated caries lesion, and which teeth and lesions are suitable for sealing. It also compares resin-based, glass ionomer, and other sealant materials, provides a step-by-step clinical placement technique, and discusses common errors, retention, maintenance, and follow-up.

Why Are Pits and Fissure Sealants Needed?

Occlusal pits and fissures are among the most caries-susceptible areas of the posterior dentition because their complex anatomy can retain food debris and bacterial biofilm and makes effective mechanical cleaning difficult. These local ecological conditions can favor an imbalance between demineralization and remineralization, increasing the risk of occlusal caries.

Fluoride remains a cornerstone of caries prevention, but its protective effects do not eliminate the anatomical vulnerability of deep pits and fissures. These narrow grooves are difficult to access with toothbrush bristles and may provide protected areas for biofilm retention. A fissure sealant addresses this problem mechanically by penetrating susceptible pits and fissures and forming a physical barrier that limits their exposure to the oral environment.

This is why sealants have an important role in occlusal caries prevention and, in appropriately selected non-cavitated lesions, can also help limit lesion progression.

Caries Experience and Sealant Prevalence in Children and Adolescents

Data from the U.S. National Health and Nutrition Examination Survey (NHANES) 2011–2012 show that caries experience rises sharply as children age, while sealant prevalence remains too low.

Age group (years)	Caries experience (permanent teeth)	Sealant prevalence (at least one)
6–8	14%	31%
9–11	29%	49%
12–19	58%	43%

Data synthesized from NHANES 2011–2012 reports.

The sharp rise from 14% in early childhood to 58% in adolescence highlights a critical window for intervention. Despite their clear benefits, sealants remain underutilized, which calls for a more proactive approach to diagnosis and clinical application.

Diagnosing Fissures Before Sealing: Stain vs. Caries

The era of minimally invasive dentistry requires a fundamental change in how we evaluate fissures. For many senior clinicians, the traditional reliance on the “explorer tug-back” was a source of clinical frustration and diagnostic uncertainty. Modern guidelines, including those from the British clinical perspective, offer welcome relief: visual assessment is the primary tool, and “picking” at fissures is largely discouraged.

Enamel-Confined vs. Dentin-Involved Lesions

The clinical priority is distinguishing enamel-confined lesions from those involving dentin:

•       Enamel-confined (initial) lesions: These appear as staining within the fissure, surrounded by healthy, translucent enamel. Radiographically, there is no radiolucency at the dentino-enamel junction (DEJ).

•       Dentin involvement: The presence of a “chalky white” or opalescent appearance around the stained fissure is a critical diagnostic marker. It indicates significant subsurface demineralization and internally stressed enamel, suggesting that the lesion has reached the dentin and requires a traditional restoration.

Preventive vs. Therapeutic Sealants

Only 38.2% of dentists are reported to follow the evidence-based recommendation to seal over non-cavitated carious lesions. This gap in practice highlights the need for clinicians to adopt two distinct categories of intervention:

•       Preventive sealants: Applied to sound surfaces to preclude bacterial colonization.

•       Therapeutic sealants: Applied to enamel-confined caries to arrest the disease process.

Indications and Contraindications for Fissure Sealants

Patient selection is the key to cost-effectiveness. The 2016 ADA/AAPD guidelines categorize recommendations by tooth type and disease status.

Which Teeth Should Be Sealed?

•       Permanent molars: There is a strong recommendation to seal both sound surfaces and non-cavitated carious lesions. Research shows a 76% reduction in caries incidence over a 2–3 year follow-up compared with non-use.

•       Primary molars: Sealants are recommended for primary teeth when the patient exhibits high caries risk or the teeth have deep, retentive pits.

Can You Seal Over Non-Cavitated Carious Lesions?

Yes, when the lesion is enamel-confined and non-cavitated. Clinicians often hesitate to “seal in” bacteria, but the scientific rationale is clear: by cutting off the nutritional supply (fermentable carbohydrates) to the trapped microflora, sealants induce a 10-fold decrease in bacterial counts. This essentially “mummifies” the lesion and halts its progression.

Contraindications and Limitations

•       Dentin involvement: A chalky white or opalescent zone around the stained fissure, or radiographic radiolucency, indicates that the lesion has progressed beyond enamel and requires a traditional restoration rather than a sealant.

•       Uncontrolled moisture: A resin sealant depends on etched enamel that stays dry, because even brief saliva contact ruins the bond. When dry isolation cannot be achieved, for example in a partially erupted molar with a gingival operculum or in a pre-cooperative patient, glass ionomer serves as the moisture-tolerant transitional sealant.

Pit and Fissure Sealant Materials: Resin-Based, Glass Ionomer, and Hybrids

The choice of material affects both the speed of the procedure and the longevity of the result. Three groups of dental sealants are in use: resin-based sealants (RBS), glass ionomer (GI) materials, and hybrids (resin-modified glass ionomers, or RMGIs, and compomers).

Material	Best suited for	Key consideration
Resin-based (RBS)	A dry, well-isolated field	Clinical gold standard for retention; unfilled types are generally preferred
Glass ionomer (GI)	Partially erupted molars and pre-cooperative patients	5 times greater risk of retention loss than RBS (ADA data)
RMGI and compomers	Situations where GI fluoride release and resin durability are both wanted	RMGIs are less water-sensitive, with longer working times than traditional GIs

Resin-Based Sealants (RBS)

RBS are the clinical gold standard for sealant retention in a dry environment.

•       Generations: Modern practice uses 3rd and 4th generation visible light-cured materials, some featuring fluoride-releasing particles.

•       Viscosity (the pragmatic choice): Unfilled sealants are generally preferred for their lower viscosity, which facilitates deeper fissure penetration. Critically, unfilled sealants are “self-adjusting” under the forces of occlusion, so they typically do not require a bur for occlusal adjustment, saving significant chair time.

Glass Ionomer (GI) Sealants

GI materials serve as “transitional sealants” because of their chemical bond and moisture tolerance.

•       Indications: Ideal for partially erupted molars where the gingival operculum prevents dry isolation, or for pre-cooperative patients.

•       Quality of evidence: ADA data indicate that GI materials carry a 5 times greater risk of retention loss than RBS, although their fluoride-releasing properties provide residual protection.

RMGI and Compomers

These hybrids attempt to balance the fluoride release of GI with the durability of resin. RMGIs offer less water sensitivity and longer working times than traditional GIs.

How to Place a Fissure Sealant: Step-by-Step Clinical Technique

Success in sealant placement depends critically on meticulous technique. The fissure sealant technique below, from preparation through sealant application and curing, prioritizes moisture control and proper substrate preparation.

Isolate (the 0.5-second rule). If etched enamel is contacted by saliva for even half a second, salivary proteins contaminate the microporosities and ruin the bond. Use a rubber dam or a high-volume isolation system.

       Prepare the fissures. Clean the fissures using a toothbrush or handpiece prophylaxis. Avoid invasive enameloplasty, which makes the tooth more vulnerable if the sealant is later lost.2.   

        Etch the enamel. Apply 35%–37% phosphoric acid. Permanent enamel requires 20 seconds. Primary enamel, because of its prismless structure, often requires a longer etch, up to 60 seconds, to achieve the necessary “chalky white/frosty” appearance.

      Decide whether to add a bonding layer (the bonding layer debate). The original evidence-based protocol is etch-only: etching highly mineralized enamel creates sufficient retention. However, applying a bonding agent can help “counteract” mild moisture contamination.

        Apply the sealant. Use a thin tip to guide the material into the grooves, starting from one end to push air out and avoid bubbles. Pay specific attention to the Lower 6 buccal pits (mandibular first permanent molar) and the Upper 6 palatal pits (maxillary first permanent molar), as these are the most frequently missed sites in clinical practice.

Apply your nice flowy sealant and don't forget the buccal pit 

Polymerize. Keep the light guide as close to the occlusal surface as possible to ensure full cure depth.

         Clean the cured surface. Immediately after polymerization, clean the surface with pumice or a rotating rubber cup to remove the oxygen-inhibited layer (see Patient Safety: BPA and Resin Sealants below).

Clinical Pearls and Common Errors in Fissure Sealant Placement

Clinical Pearls for the Chair-Side

•       Bubble management: If a void is detected after curing, re-etch the area for 10 seconds before adding material.

•       Material choice: Dedicated sealant materials are more practical than flowable composites because of their higher flowability and specialized, long-reaching tips.

Troubleshooting Common Errors

•       Overfilling: Avoid creating an occlusal “ledge.” A ledge at the margin can trap food and promote secondary decay, negating the preventive benefit.

•       Moisture failure: If the “frosty” appearance is lost due to saliva, you must re-isolate and re-etch.

•       Missed sites: The Lower 6 buccal pits and Upper 6 palatal pits are the most frequently missed sites in clinical practice (see step 5 of the technique above).

Sealant Maintenance, Recall, and Success Rates

Sealants are a dynamic treatment. When they are part of a “recall and repair” program, 10-year success rates reach 85%. Without periodic “top-ups,” the failure rate increases significantly. A partially lost sealant should be repaired or “topped up” at the recall appointment to maintain the physical barrier.

Patient Safety: BPA and Resin Sealants

Bisphenol A (BPA) in resin materials is a transient clinical concern. Small amounts may be detected in saliva immediately after placement, but there is no evidence of systemic health risks.

The clinical solution: The unreacted monomers are located in the oxygen-inhibited layer on the surface of the cured resin. To minimize exposure, immediately clean the surface with pumice or a rotating rubber cup after polymerization.

Frequently Asked Questions About Pits and Fissure Sealants

What are pits and fissure sealants used for?

They act as a physical barrier on the occlusal surface, denying bacterial biofilm access to fermentable carbohydrates. This protects the deep, narrow fissures where topical fluoride often cannot reach the enamel–biofilm interface.

Which teeth should be sealed?

The 2016 ADA/AAPD guidelines strongly recommend sealing both sound surfaces and non-cavitated carious lesions on permanent molars. Primary molars are sealed when the patient has high caries risk or the teeth have deep, retentive pits.

Can I seal over a stained fissure or an early carious lesion?

Yes, if the lesion is enamel-confined: staining surrounded by healthy, translucent enamel, with no radiolucency at the DEJ. A “chalky white” or opalescent zone around the stain, or radiographic radiolucency, points to dentin involvement and calls for a restoration instead.

Should I use resin-based or glass ionomer sealants?

Resin-based sealants are the clinical gold standard for retention in a dry environment, and unfilled types are generally preferred because they penetrate deeper into narrow fissures and are self-adjusting under occlusion. Glass ionomer is a moisture-tolerant transitional option for partially erupted molars or pre-cooperative patients, but ADA data indicate a 5 times greater risk of retention loss than RBS.

Is a bonding agent necessary?

No. The standard evidence-based protocol is etch-only, because etching highly mineralized enamel provides sufficient retention. A bonding agent acts as a safety net against mild moisture contamination.

How long should enamel be etched before sealing?

With 35%–37% phosphoric acid, permanent enamel needs 20 seconds. Primary enamel has a prismless structure and often needs up to 60 seconds to reach the chalky white/frosty appearance.

How important is isolation, and what is the 0.5-second rule?

Moisture control is critical to the bond. If saliva contacts etched enamel for even half a second, salivary proteins contaminate the microporosities and ruin the bond, so the surface must be re-isolated and re-etched. Use a rubber dam or a high-volume isolation system.

What are the most common errors in fissure sealant placement?

Moisture contamination, voids, overfilling that leaves an occlusal ledge, and missed sites. The Lower 6 buccal pits and Upper 6 palatal pits are missed most often. If the frosty appearance is lost, re-isolate and re-etch; if a void appears after curing, re-etch for 10 seconds before adding material.

How long do fissure sealants last, and how are they maintained?

In a “recall and repair” program, 10-year success rates reach 85%, while failure rates increase significantly without periodic top-ups. A partially lost sealant should be repaired or topped up at the recall appointment to maintain the physical barrier.

Is BPA in resin sealants a safety concern?

Small amounts of BPA may be detected in saliva immediately after placement, but there is no evidence of systemic health risks. To minimize exposure, remove the oxygen-inhibited layer, where unreacted monomers sit, with pumice or a rotating rubber cup immediately after polymerization.

References

Wright JT, Tampi MP, Graham L, et al. Sealants for preventing and arresting pit-and-fissure occlusal caries in primary and permanent molars: a systematic review of randomized controlled trials—A report of the American Dental Association and the American Academy of Pediatric Dentistry. J Am Dent Assoc. 2016;147(8):631–645.e18.

Wright JT, Crall JJ, Fontana M, et al. Evidence-based clinical practice guideline for the use of pit-and-fissure sealants: A report of the American Dental Association and the American Academy of Pediatric Dentistry. J Am Dent Assoc. 2016;147(8):672–682.e12.

American Dental Association. Dental Sealants. ADA Oral Health Topics. Updated resource covering indications, sealant materials, caries prevention, and the role of sealants in comprehensive caries management.

Muller-Bolla M, Lupi-Pégurier L, Tardieu C, Velly AM, Antomarchi C. Retention of resin-based pit and fissure sealants: A systematic review. Community Dent Oral Epidemiol. 2006;34(5):321–336. doi:10.1111/j.1600-0528.2006.00319.x.

Bagherian A, Sarraf Shirazi A, Sadeghi R. Adhesive systems under fissure sealants: yes or no? A systematic review and meta-analysis. J Am Dent Assoc. 2016;147(6):446–456. doi:10.1016/j.

Shear bond strength and microleakage of fissure sealant to contaminated and non-contaminated enamel: A systematic review and meta-analysis of in vitro studies. PubMed-indexed systematic review.

Retention of resin-based versus glass ionomer pit and fissure sealants in permanent molars: A systematic review of randomized clinical trials. J Indian Soc Pedod Prev Dent. 2025. doi:10.4103/jisppd.jisppd_371_25.