Objective:
The objective of this prospective clinicaltrial study was to evaluatethe 4-year clinical performance of an ormocer-based nano-hybrid resin composite(CeramX;Dentsply/DeTrey) in Class II restorations placed with a one-step self-etch (XenoIII;Dentsply/DeTrey) and two-step etch-and-rinse adhesive(IvoclarVivadent).
Methods:
Seventy-eight participants received at random at least two, as similar as possible,
Class II restorations of the nano-hybrid resin composite bonded with either a single step self-etch adhesive or a control 2-step etch-and-rince adhesive.The165restorations were evaluated using slightly modified USPHS criteria at baseline and then yearly during 4 years.
Results:
162 restorations were evaluated at 4 years.Postoperative sensitivity was observed in 6 patients(3 Xeno III, 3Exite) between 1 and 3 weeks. Eleven failed restorations (6.8%) were observed during the followup. Seven in the one-step self-etch adhesive group (7.7%) and four int he2-step etch-and-rinse group(5.6%). This resulted in non-significant different annual failure rates of 1.9%and1.4%, respectively. Fracture of restoration was the main reason for failure.
Conclusion:
The ormocer-based nano-hybrid resin composite showed a good clinical per-
formance in Class II cavities during the 4 year evaluation. No significant difference was seen in overall clinical effectiveness between the two adhesives.