Dentin-polymer bond established by Gluma and tested by thermal stress

The walls of cylindrical cavities in human dentin were treated with Gluma and various resins before filling with either a microfilled or a macrofilled composite (Silux, P-30 or Concise). The extent of gaps (crevices) along the tooth/filling interface was observed before and after thermal cycling at restorations polished either 10 min or 24 h after curing of the composite. Application of a resin containing polymerization initiators and 1% propanal before filling with Silux or Concise resulted in restorations without contraction gaps along the tooth/filling interface. When P-30 was used in this procedure, one of six of the fillings exhibited gaps, but none of the six did so when removal of the marginal excess was postponed for 24 h.