Comparison of 2 Different Resin Based Filling Materials in Posterior Teeth - a Multicenter Study

Inclusion Criteria: * Patients should be 18 years and older. * Study teeth should have an interproximal (Class II) carious lesion or an existing defective class II restoration requiring restorative therapy on premolars or molars. * The maximum cavity depth determined by the radiograph will be D2 (Tyas classification). * The teeth included in the study need to have a proximal contact with the adjacent tooth and be in occlusion with the opposing dentition. * The teeth included in the study should be vital with no signs of pulpal pathology. * Patients that report brushing regularly without severe gingival inflammation and/or extensive caries. * Patients should have no allergies or systemic diseases which inhibit the treatment. * Patients should have voluntary participation and sign a written informed consent form. * Patients should be willing to participate in the recall/re-examination appointments. Exclusion Criteria: * Simultaneous participation in another study about dental restorative materials. * Written informed consent form not signed. * Nonvital pulp / periapical lesion. * Insufficient oral hygiene despite detailed instructions. * Pregnancy/ breast feeding before placement of the study restoration. * Minors. * Severe malocclusion/ malalignment/ traumatic occlusion/ bruxism. * Known allergy to any components present in any of the materials that are used for this study. * Unclear mucosal alterations, e.g. oral lichenoid reactions/lesions. * Severe medical complications …