RESEARCHES REGARDING THE PROFILE OF THE FINISHED SURFACES OF SOME DIRECT LIGHT CURED COMPOSITE MATERIALS

• Main Authors: Irina Grădinaru, Liana Diaconu, Elena Raluca Baciu, Maria Baciu, Daniela Calamaz
• Format: Article
• Language: English
• Published: Romanian Society of Oral Rehabilitation 2013-07-01
• Series: Romanian Journal of Oral Rehabilitation
• Subjects: composite materials; dental materials; roughness; surface quality
• Online Access: http://www.rjor.ro/researches-regarding-the-profile-of-the-finished-surfaces-of-some-direct-light-cured-composite-materials/?lang=ro

Introduction. The composite resins are the most commonly used materials in dentistry. In recent years, researchers have turned their interest to the studies on quality parameters of dental biomaterials. Goal. The investigations on surface quality aimed at highlighting roughness variations corresponding to the samples of various direct coronary restorative materials whose finishing was achieved by mechanical polishing. Material and method. For this research we used 3 light-curing composite materials of nanohybrid type (Herculite, Synergy D6 and Brilliant). Specimens were made in the laboratory of Dental Materials within the Faculty of Dental Medicine, “Gr. T. Popa” University of Medicine and Pharmacy of Iaşi. The surfaces finished by polishing were subjected to imaging tests and experimental measurements at nanoscale by using Nanosurf Easy Scan 2 AFM atomic force microscopy system. Results and discussion. The experimental researches carried out to determine the nanometer profile of each surface revealed the 3D image of the topography obtained after finishing by polishing, the nanometric profile of the midline corresponding to the investigated area, the 2D image obtained by deflection of the analysed surface. Conclusions. The determination of nanometric profile of surfaces through investigations carried out by atomic force microscopy (AFM) is a way of highlighting the microrelief topography resulted at the end of finishing by polishing. After polishing with abrasive gums, the nanometric profile having the smallest size (268.3nm) was obtained for Brilliant material. After having analyzed the dispersion of the values of total size of the nanometric profile for the three direct coronal restorative materials under study, we may notice that dispersion intervals have close limits, the lowest interval being characteristic to the surfaces obtained with Herculite and Brilliant commercial products.