ADAPTATION OF A RESIN COMPOSITE IN-VIVO

Objectives: The adaptation of experimental dentine bonding systems has been evaluated in vivo. Methods: A cylindrical cavity which extended into dentine was prepared in the facial surface of vital teeth that we re to be extracted for orthodontic reasons. The preparations were rest ored with a commercial light-activated resin composite that was mediat ed by experimental dentine bonding systems. The restored teeth were ex tracted as soon as possible following polymerization of the composite. The marginal and internal adaptation of the resin composite restorati on was observed under a light microscope in both horizontal and longit udinal sections of the teeth immediately after extraction. Results: Of the experimental dentine bonding systems investigated, those includin g a primer of glyceryl methacrylate showed complete adaptation whereas those with primers of 2-HEMA showed a contraction gap in three out of 10 specimens.