title: Bond between subsequently added light activated composite resin and hardened material.
abstract: Because of the limited depth of cure, subsequent layers frequently have to be cured separately in connection with large fillings of light activated composite resins. This method is successful only provided that the different layers adhere to each other. Rectangular rodlike specimens of four light activated composites, two macro- and two microfilled brands, were made in three pieces cured separately (test specimens). The transverse strength of these specimens was compared with that of specimens made in one piece (controls). The strength of both test and control specimens of the macrofilled brands was the same even when water contamination was included when preparing the test specimens. In connection with the microfilled brands there was an indication of lower strength, at least after water contamination.
mesh_terms: D055598:Chemical Phenomena; D002627:Chemistry, Physical; D003188:Composite Resins; D001840:Dental Bonding; D005069:Evaluation Studies as Topic; D013314:Stress, Mechanical; D014867:Water
chemical_list: D003188:Composite Resins; D014867:Water