Development of adhesive pit and fissure sealants using a MMA resin initiated by a tri‐n‐butyl borane derivative

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Abstract
A new adhesive fissure sealant, which consists of a solution of 3% 2‐hydroxy‐3‐β‐naphthoxypropyl methacrylate in methyl methacrylate (MMA), poly‐MMA powder and an oxidized tri‐n‐butyl borane, a polymerization initiator, was developed. Tensile bond strength between an acid‐etched bovine enamel and a poly‐MMA bar joined by this sealant was 60 kg/cm2, and the value did not decrease much after 30 days immersion in water at 37°C. Penetration of fuchsin into the sealant–enamel interface during a percolation test was not observed. SEM observation showed no voids between the enamel and the cured sealant.