Method: IRB approval was obtained and consent forms were signed. Seven Class I and 46 Class II restorations were placed by three operators in 38 patients. All restorations were placed under rubber dam isolation and Giomer materials were used according to manufacture’s instruction, and then the restorations were immediately finished and polished. Evaluations were assessed at baseline and 6, 18months, 3years and 5years using the following modified USPHS criteria (Retention, Color Match, Marginal Adaptation, Marginal Discoloration, Anatomical Form, Surface Roughness, Surface Staining, Secondary caries, Contact, Fracture, Sensitivity) and Gingival status by the two operators. Additionally, all restorations were photographed at each evaluation.
Result: Ten restorations were unavailable for clinical evaluation at 5 years. At all recall periods, patients reported no post-operative sensitivity in any of the restored teeth. Slight color change and surface staining were showed in 10 cases and 3 cases respectively. Slight marginal change was observed in 28 restorations after 5 years. These marginal changes at the enamel cavo-surface margins were attributed to chip fracture of composite resin due to overfilling the composite resin onto the uncut enamel surface.
Conclusion: With the limitation of this study, the clinical performance of the posterior restorations placed using the Giomer materials was clinically acceptable after 5 years. Supported by Shofu Inc., Japan.