Noninvasive pit and fissure sealing: Microtensile bond strength to intact bovine enamel of different pit and fissure sealants in a simplified fissure model

Federica Papacchini, Álvaro H. Cury, Cecilia Goracci, Nicoletta Chieffi, Franklin R. Tay, Antonella Polimeni, Marco Ferrari

Research output: Contribution to journalArticle

13 Scopus citations

Abstract

Purpose: To measure the microtensile bond strength of different pit and fissure sealants in a simplified fissure model. Materials and Methods: Twenty extracted bovine mandibular permanent incisors were randomly divided into 4 groups for treatment: G1: 35% phosphoric acid/Clinpro Sealant; G2: 35% phosphoric acid/Delton; G3: Non-Rinse Conditioner/Dyract Seal; G4: 20% polyacrylic acid/Fuji IILC. Each tooth was sectioned into 6 pieces (4 × 6 mm) of buccal enamel. SEM examination was used to confirm the presence of aprismatic enamel on each tooth. Using a spacer, two pieces of etched enamel were secured to a glass slide at a mean distance of 0.6 ± 0.1 mm. The space between enamel substrates was then etched/conditioned and sealed with different materials according to the tested groups. By serially cutting each double-bonded sample, multiple beam-shaped specimens about 0.8mm2 in cross section were obtained and tested in tension (0.5 mm/min) until failure occurred at either one of the two stressed interfaces. Failure modes were classified by stereomicroscopy. Results: G1 and G2 showed statistically higher bond strengths than G3 and G4. G4 demonstrated the significantly lowest bond strength. Failures were mostly adhesive in G1, G2, G3, and mainly cohesive/mixed in G4. Conclusion: According to this model, resin-based materials (Clinpro Sealant, Delton) showed better microtensile bond strength than compomer (Dyract Seal) or resin-modified glass ionomer (Fuji IILC).

Original languageEnglish (US)
Pages (from-to)375-380
Number of pages6
JournalJournal of Adhesive Dentistry
Volume8
Issue number6
StatePublished - 2006

Keywords

  • Aprismatic enamel
  • Bovine enamel
  • Double interface
  • Microtensile bond strength
  • Sealant

ASJC Scopus subject areas

  • Orthodontics
  • Oral Surgery
  • Periodontics

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