Clinical Evaluation of a Universal Nano-hybrid (NEUN) on Posterior Restorations

Objectives: This study compared the clinical performance of a new universal nano-hybrid resin composite (NEUN, Heraeus Kulzer) with a currently marketed resin VENUS, (Heraeus, Kulzer) over a one year period. Methods: Thirty-nine NEUN and 38 Venus Class I class and II posterior restorations were placed in 30 subjects. Following conventional procedures for cavity preparation the teeth were etched, bonded with GLUMAŽ Comfort-Bond Desensitizer restored and polished following manufacturer's instructions. The teeth were evaluated using the following criteria: Anatomic Form (AF), Color Match (CM), Marginal Integrity (MI), Marginal Discoloration (MD), Surface Staining (SS), Gingival Index (GI), Retention/Fracture (RF), Secondary Caries (SC), Proximal Contact (PC), Polishability (PO) and Sensitivity (SE). At one year, 32 NEUN and 31 VENUS restorations were evaluated. Using a modified USPHS grading system the following results were found in percentages (BL = Baseline, 1Y = One Year).

Results: 1.) For both resins, AF, SC, SS, MI and MD remained unchanged at 95 to 100% Alpha between baseline and one year. 2.) CM also remained unchanged with approx. 65 % alpha and 35% Bravo after one year. 3.) One Venus restoration had an open proximal contact at one year. 4.) 82% of NEUN and 52% VENUS restorations were rated Bravo at Baseline. At One year only 72% of the NEUN and 16% of the VENUS restorations were rated Bravo. 5.) Two subjects had slight inflammation of the gingival tissue surrounding their study teeth at the one year evaluation. 5.) No study teeth had sensitivity at the one year evaluation. Conclusion: This study indicates a high level of clinical performance for NEUN as a posterior restorative material. This study was supported by Heraeus Kulzer, Inc.