This paper describes the results of an evaluation of the occlusal marginal adaptation of Class II restorations in a clinical trial. The margins of 183 resin composite and 61 amalgam restorations, made by three dentists, were assessed. An indirect evaluative method has been applied, that uses a shadowing photographic technique to produce images of impressions. The restorations were classified into excellent and nonexcellent marginal adaptation categories and on this basis influencing factors were determined. Resin composite restorations appeared to show more 'excellent' margins than amalgam restorations (64.5 percent and 21.3 percent, respectively). The variable mainly influencing the marginal adaptation of the composite restorations was the dentist. In addition, the influence of an occlusal level is discussed, since a difference of marginal adaptation between bevelled and nonbevelled parts of the occlusal outline was observed.
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