# Pit and Fissure Sealant Programmes > Sealant programmes for BDS Community Dentistry: resin versus glass ionomer sealants, etching technique, retention and school targeting. - Canonical URL: https://prepelephant.com/topics/bds/community-dentistry/sealant-programmes-community - Exam / course: BDS · Subject: Community Dentistry - Publisher: PrepElephant (https://prepelephant.com) — Prepared and reviewed by the PrepElephant Academic Review Team - First published: 2026-10-02 - Last updated: 2026-10-02 - How to cite: "Pit and Fissure Sealant Programmes", PrepElephant, https://prepelephant.com/topics/bds/community-dentistry/sealant-programmes-community ## Direct answer Pit and fissure sealants seal the deep grooves of newly erupted molars — the anatomy where the great majority of childhood caries starts — by flowing a resin or glass ionomer material into the fissure after 37 per cent phosphoric acid etching creates microporous enamel for bonding. Because the occlusal surface of a first molar is caries-prone within a couple of years of eruption at age 6, the programme window is narrow and predictable: seal second molars around 12 to 13, first molars around 6 to 7. Evidence consistently shows sealants substantially reduce occlusal caries in permanent molars of children and adolescents compared with no sealant, with resin-based materials retaining best; systematic reviews have found caries incidence in sealed teeth to be roughly half or less that of unsealed teeth. In community practice, the decisive variables are retention surveillance and targeting — sealing the right teeth in the right mouths, and rechecking them. ## What you must remember - **Anatomy rationale:** pits and fissures are too deep for toothbrush bristles and plaque stagnates at their base; a large share of caries in children's permanent teeth begins on occlusal molar surfaces, which fluoride protects least because it works best on smooth surfaces. - **Technique sequence:** clean the surface, isolate with cotton rolls or rubber dam (the single strongest predictor of success), etch 15-20 seconds with 37 per cent phosphoric acid, rinse and dry to a frosty-white appearance, apply sealant, cure, check occlusion — moisture contamination at any step causes loss. - **Material choice:** resin-based (BIS-GMA or similar) for best retention; glass ionomer cements leach fluoride and tolerate moisture, making them the choice for uncooperative children and for atraumatic restorative technique (ART) settings despite lower retention. - **Timing windows:** first permanent molars at 6-7 years, second molars at 11-13 years — seal within a few years of eruption, when caries risk peaks. - **Evidence shape:** systematic reviews (including the Cochrane review) report that sealed first molars develop caries far less often than unsealed controls; retention of resin sealants remains high in early years and complete loss returns the tooth to risk. - **Sealing over incipient lesions:** non-cavitated enamel lesions can be sealed — sealants arrest lesion progression beneath them, a finding repeatedly demonstrated and now standard guidance. - **Programme economics:** sealants are among the most cost-effective school measures when targeted at high-caries-risk children. ## Running a school sealant programme Build one district programme and the theory arranges itself. Step one, choose schools by disease, not convenience: a quick baseline screening identifies schools with high caries prevalence and first molar caries patterns. Step two, obtain consent through parents in the local language. Step three, deploy logistics: portable light, unit-dose supplies, sterilised instruments, cotton-roll isolation on school chairs, with the most experienced operator placing sealants — a wet, wiggly six-year-old molar is technique-sensitive surgery in miniature. Step four, record which tooth-surface received which material on which date, because follow-up is the programme's spine. Step five, re-examine at six to twelve months, resealing partial losses; a sealant lost after a year has usually already delivered much of its protection, but a lost sealant on a still-caries-active child is an emergency of small size. Evaluate by retention rates and by caries incidence in sealed versus unsealed molars — outputs (teeth sealed) are not outcomes (cavities prevented). ## Where students slip The first error is treating sealants and fluoride as rivals — they are complementary, protecting different surfaces: fluoride for smooth surfaces and remineralisation, sealants for fissure anatomy. The second is the isolation answer: asked why a sealant failed, the candidate who says "material defect" loses to the one who says "saliva contamination during placement". Third, students forget that glass ionomer sealants have a defined role — ART, cooperative limitations, partially erupted molars — where their fluoride release and moisture tolerance outweigh weaker retention. Fourth, the contraindication set deserves precision: an already-cavitated lesion with dentine involvement needs restoration, not sealant, and a low-risk child with shallow self-cleansing grooves needs nothing. Finally, the phrase "permanent sealant" should never be spoken; sealants are retained for years, not forever, and surveillance is part of the treatment. ## Frequently asked questions ### At what ages should first and second permanent molars be sealed? First molars around 6-7 years soon after eruption, and second molars around 11-13 years, matching the peak caries-susceptibility window of occlusal surfaces. ### Which step most often determines sealant success? Moisture control — isolation with cotton rolls or rubber dam during etching and placement, since saliva contamination prevents micromechanical bonding. ### Can a sealant be placed over an incipient carious lesion? Yes, non-cavitated enamel lesions can be sealed; the sealant arrests progression by cutting off the plaque biofilm's nutrient supply. ### Why choose glass ionomer over resin for some children? Glass ionomer tolerates moisture and releases fluoride, suiting partially erupted molars, uncooperative children and ART programmes despite lower retention than resin. ### How should a sealant programme be evaluated? By retention rates at recall and by caries incidence in sealed versus unsealed surfaces — outcome measurement, not merely counts of teeth sealed.