title: Three-year randomised clinical trial to evaluate the clinical performance, quantitative and qualitative wear patterns of hybrid composite restorations.
abstract: The aim of the study was to compare the clinical performance, quantitative and qualitative wear patterns of conventional hybrid (Tetric Ceram), micro-filled hybrid (Gradia Direct Posterior) and nano-hybrid (Tetric EvoCeram, TEC) posterior composite restorations in a 3-year randomised clinical trial. Sixteen Tetric Ceram, 17 TEC and 16 Gradia Direct Posterior restorations were placed in human molars and evaluated at baseline, 6, 12, 24 and 36 months of clinical service according to US Public Health Service criteria. The gypsum replicas at each recall were used for 3D laser scanning to quantify wear, and the epoxy resin replicas were observed under scanning electron microscope to study the qualitative wear patterns. After 3 years of clinical service, the three hybrid restorative materials performed clinically well in posterior cavities. Within the observation period, the nano-hybrid and micro-hybrid restorations evolved better in polishability with improved surface gloss retention than the conventional hybrid counterpart. The three hybrid composites showed enamel-like vertical wear and cavity-size dependant volume loss magnitude. Qualitatively, while the micro-filled and nano-hybrid composite restorations exhibited signs of fatigue similar to the conventional hybrid composite restorations at heavy occlusal contact area, their light occlusal contact areas showed less surface pitting after 3 years of clinical service.
authors: Leuven BIOMAT Research Cluster, Department of Conservative Dentistry, School of Dentistry, Oral Pathology and Maxillo-Facial Surgery, Catholic University of Leuven, Kapucijnenvoer 7, 3000 Leuven, Belgium.
authors: Senthamaraiselvi
authors: S
authors: Palaniappan
authors: Liesbeth
authors: L
authors: Elsen
authors: Inge
authors: I
authors: Lijnen
authors: Marleen
authors: M
authors: Peumans
authors: Bart
authors: B
authors: Van Meerbeek
authors: Paul
authors: P
authors: Lambrechts
mesh_terms: D000704:Analysis of Variance; D001641:Bicuspid; D003188:Composite Resins / Q000737:chemistry; D019554:Dental Restoration Wear; D003793:Dental Restoration, Permanent / Q000379:methods*; D006801:Humans; D021621:Imaging, Three-Dimensional / Q000379:methods; D008855:Microscopy, Electron, Scanning; D003765:Models, Dental; D008963:Molar; D053761:Nanocomposites; D010316:Particle Size; D011446:Prospective Studies; D018709:Statistics, Nonparametric; D013382:Subtraction Technique; D013499:Surface Properties
chemical_list: D003188:Composite Resins; C470230:Gradia; C501891:Tetric EvoCeram; C121818:Tetric ceram