Prospective, Split-mouth, Comparative Study to Compare Clinical Outcomes of Two Different Posterior Composite

Inclusion Criteria: * Each subject must need at least 2 restorations in a vital posterior tooth (in different quadrants) * Restorations may be indicated for caries removal and restoration, replacement of defec-tive restorations (i.e. fractured, stained, unaesthetic), or requested replacement of un-aesthetic restorations. * Must have given written consent to participate in the trial * Must be available for the required follow-up visits over 2 years * Restored teeth must have occlusal contact with opposing teeth or restored teeth * Restoration width should be equal to or greater than 1/3 the distance from buccal to lin-gual cusp tips * 75% of the restorations Class II (minimum) and 25% Class I * One, two or three surfaces per restoration * Each Class II will have at least one proximal contact * 75% in molars (minimum) and 25% in premolars * All restored teeth must have at least one occlusal contact in habitual closure * Must have 20 or more teeth with evidence of bilateral posterior tooth contacts * Teeth that require one or no cuspal build-ups * Vital tooth * Preoperative sensibility on the teeth to be treated at maximum 3 on visual analog scale (10 = maximum) * Patient wishes to be treated in this clinical trial after oral information by the operator and after signing the informed patient form Exclusion Criteria: * Allergies to ingredients of the materials under investigation (monomers) * Do not meet all inclusion criteria above * Have medical complications (organ transpla…