M. ROSENTRITT, M. PENZKOFER*, M. BEHR, G. HANDEL
(Department of Prosthetic Dentistry, University of Regensburg, Germany)
The aim of this study was to investigate and compare the in-vitro wear of dental materials in an artificial mouth with respect to the occlusal design of the specimen. 32 rectangular plates and 32 occlusal molar surfaces were made of the following materials according to the manufactures instructions. Veneering composites: Sinfony (3M Epse, G) and SR-Adoro (Ivoclar-Vivadent, FL), unglazed all-ceramic Empress2 core and amalgam (Amalcap, both Ivoclar-Vivadent ). The relationship between antagonist (all-ceramic Empress) and specimen was fixed in a dental articulator and transferred to the artificial masticator (EGO, G). All specimen were aged in the artificial mouth with occlusal loading and lateral movement (TCML: 240x5°/55°C, H20, 2min. each cycle, 120.000x50N). For all specimen plaster models were fabricated before and after TCML and investigated with an optical 3D laser scanner (Willytec, G). The wear traces were characterized, as well as the maximum wear depth (WD) and the volumetric wear (VW) were determined and statistically analyzed (Mann-Whitney-U-test, p = 0.05).
|WD [µm]||84 (73/89)||187 (109/224)||132 (125/143)||89 (81/103)|
|VW [µm3]||1.5 (1.3/1.5)||7.6 (9.8/4.3)||3.7 (3,5/4.0)||2.7 (2.5/3.3)|
The veneering composite SR-Adoro showed wear comparable to Amalgam. For Sinfony significantly higher wear was found. Highest wear could be determined for unglazed Empress 2 core material. Under this testing design, all materials showed individual wear tracks.