The cavity sealing ability of composite restorations subjected to thermal stress.
An artificial caries technique, using a diffusion controlled acidified gel, was used to create in vitro artificial lesions adjacent to composite restorations. Prior to gel immersion, test specimens were temperature-cycled in a machine designed specifically for this purpose. Examination of control specimens showed little evidence of leakage, the presence of a cavity wall lesion being used as an indication of leakage. Compared to the controls, the test specimens showed either a reduction or no change in leakage pattern. It is suggested that thermal percolation may not be of clinical significance in relation to composite restorations.
D000042:Absorption; D055598:Chemical Phenomena; D002627:Chemistry, Physical; D003188:Composite Resins; D003743:Dental Enamel / Q000187:drug effects / Q000648:ultrastructure; D005782:Gels; D006801:Humans; D007773:Lactates / Q000494:pharmacology; D013499:Surface Properties; D013696:Temperature; D014867:Water
D003188:Composite Resins; D005782:Gels; D007773:Lactates; D014867:Water