[Studies on the rim closure in composite resins in vivo]

On 2 monkeys, adhesive fillings with Concise, using the Enamel Bond technique were made on 8 permanent and 12 deciduous teeth. A clinical check about 1 year later showed good results in the permanent dentition while the results in deciduous teeth were varied (loss of substance, pigmentations). The examination of marginal fit by aniline blue and a vacuum technique showed that in permanent teeth, 87.5% were impermeable, in deciduous teeth only 25%. Examination in the REM showed a perfect adaptation of the filling material to the enamel at the margins, while cohesion fractures were found within the material. The surface of the material was found to be rough after functional use. The bad results in deciduous teeth is explained by the thinness of the enamel in the experimental animal and by its parafunctioning. It is deduced that adhesive fillings are stable and impermeable after 1 year, provided there is no functional abrasion possible. The results should be confirmed by further, longerlasting experiments