Sealant Retention Calculator
Estimate sealant retention rates and expected lifespan based on tooth type, patient age, and material.
About this calculator
Estimated Retention Rate comes from a Cochrane-based decay curve built into this calculator (Ahovuo-Saloranta et al., 2017, CD001830.pub5): resin-based sealants track that review's reported complete-retention figures of roughly 90% at 12 months, >80% at 24 months, and 39% by 108 months, while glass ionomer follows the same review's markedly steeper drop-off (mean ~8% complete retention by 36-48 months). Both curves are smoothed interpolations through those reported figures rather than a literal reproduction of every published data point, so treat the exact percentage as a close approximation, not an isolated cited statistic. Years Since Placement is what actually drives the decline: as more time passes since placement, Estimated Retention Rate only ever holds steady or falls, never climbs back up. The underlying tables only report data out to year 7 (resin) -- beyond that, the calculator holds the year-7 value flat through year 15 rather than extrapolating further decline, so treat any reading past year 7 as a floor estimate, not a literal year-by-year figure.
Material Type and Tooth Type each apply their own fixed adjustment on top of that base curve -- molars get a small retention penalty relative to premolars, and very young patients (under 8) get a further reduction reflecting cooperation during placement -- but neither Patient Age nor Years Since Placement plays any role in Expected Lifespan, which depends only on Material Type and Tooth Type. Resin-based sealants are given a longer Expected Lifespan than glass ionomer in this model, consistent with the Cochrane finding that resin sealants retain substantially better than glass ionomer long-term, though real outcomes vary by patient, technique, and follow-up care far more than any single number can capture. Reapply Recommendation simply flags "reapply" once Estimated Retention Rate drops below 50%.
Medical Disclaimer
This calculator is for informational and educational purposes only. It is not a substitute for professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider before making decisions about your health. Never disregard professional medical advice or delay seeking it because of results from this tool.
Inputs
Results
Estimated Retention Rate
76%
Expected Lifespan
5.5 years
Figures current as of 2017. Source: Ahovuo-Saloranta A, Forss H, Walsh T, Nordblad A, Mäkelä M, Worthington HV. Pit and fissure sealants for preventing dental decay in permanent teeth. Cochrane Database Syst Rev. 2017;7:CD001830.
How to Use This Calculator
- Select Tooth Type (Molar or Premolar).
- Enter Patient Age at Placement and Years Since Placement.
- Select Material Type (Resin-Based or Glass Ionomer).
- Review Estimated Retention Rate (%) and Expected Lifespan (years).
- Use Reapply Recommendation to inform your decision.
How the result changes with Patient Age at Placement
| Patient Age at Placement | Estimated Retention Rate | Expected Lifespan |
|---|---|---|
| 4 | 69.9% | 5.5 years |
| 6 | 69.9% | 5.5 years |
| 12 | 76% | 5.5 years |
| 20 | 76% | 5.5 years |
What each input means
- Tooth Type
- Molars have deeper pits/fissures and slightly lower sealant retention
- Patient Age at Placement
- Age when sealant was placed; younger patients may have lower retention
- Years Since Placement
- How many years ago the sealant was placed
- Material Type
- Resin-based sealants have higher retention; glass ionomer tolerates a moist field better during placement
How this is calculated
Worked example, using the default values
- Identify Input Parameters4 parametersTooth Type = 1, Patient Age at Placement = 8, Years Since Placement = 2, Material Type = 1 = 4 input(s) provided
- Calculate Estimated Retention RateEstimated Retention Rate76 = 76%
- Calculate Expected LifespanExpected Lifespan5.5 = 5.5
Figures and sources
- Pit and fissure sealant retention (Cochrane systematic review) (2017) — Ahovuo-Saloranta A, Forss H, Walsh T, Nordblad A, Mäkelä M, Worthington HV. Pit and fissure sealants for preventing dental decay in permanent teeth. Cochrane Database Syst Rev. 2017;7:CD001830.
Engine last updated . Checked against 1 independently-derived test — how we verify calculators. Built by Paul Gunder, a software engineer, not a licensed financial, medical, or legal professional.
Frequently Asked Questions
Is the retention percentage this calculator shows a cited clinical statistic?
It's a smoothed curve built from real figures in the Cochrane review of pit-and-fissure sealants (Ahovuo-Saloranta et al., CD001830.pub5) -- resin retention tracks that review's reported ~90% at 12 months down to 39% at 108 months, and glass ionomer tracks its much steeper drop to roughly 8% complete retention by 36-48 months. The curve is interpolated between those reported points rather than a literal transcription of every study in the review, so treat the exact percentage as a close approximation rather than an isolated cited figure.
Does Patient Age affect how long the sealant is expected to last?
Patient Age at Placement changes Estimated Retention Rate -- younger children get a small reduction reflecting cooperation during the procedure -- but it has no effect at all on Expected Lifespan, which this calculator computes purely from Material Type and Tooth Type regardless of the age entered.
Why does the retention rate stop changing after year 7?
The Cochrane data this calculator is built from only reports resin retention out to about 108 months (9 years), and this calculator's table stops at year 7. Past that point the calculator holds the year-7 value flat all the way through year 15 instead of guessing at further decline, so a reading at year 10 and a reading at year 15 will look identical -- treat that plateau as "at least this low," not a precise long-term figure.
Why does Material Type matter for Expected Lifespan, and how does glass ionomer differ clinically?
Resin-based sealants are assigned a longer Expected Lifespan than glass ionomer in this calculator's model -- 5.5 to 7 years depending on tooth type, versus 2.5 to 3.5 years for glass ionomer -- reflecting the Cochrane finding that resin retains substantially better long-term. Glass ionomer is still sometimes chosen anyway, but the real clinical rationale (ADA/AAPD, 2016) is its hydrophilicity -- it tolerates a moist field better during placement on partially erupted teeth -- not fluoride release, and that same guideline found no statistically significant difference in caries prevention between the two materials.
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