“…3,4 The 3-year results of a prospective randomized study have been published, showing no diffferences in survival and clinical behavior between ormocer-based and bis-GMA-based composites in class II cavities. 5 Since most composites presently achieve a longer lifespan, 6 it was decided to continue the observation. Therefore, the aim of the study was to evaluate the clinical performance of two ormocer-containing micro particle hybrid composite restorative systems (AD: Admira/Admira Bond, VOCO, Cuxhaven, Germany and DE: Definite/Etch & Prime 3.0, Degussa, Hanau, Germany, now out of the market) and to compare it to that of a conventional fine-particle hybrid composite restorative system (TC: Tetric-Ceram/Syntac Sprint, Ivoclar-Vivadent, Schaan, Liechtenstein, also out of the market presently).…”