UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS

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2024-11-23 17:56
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Conference: Bucharest University Faculty of Physics 2016 Meeting


Section: Polymer Physics


Title:
Comparative ultrastructural analysis of dentin surfaces mechanically prepared using conventional and polymer milling machines


Authors:
Irina GHEORGHIU(1), Valentin BARNA(2), Catalin BERLIC(2)


Affiliation:
1)“Carol Davila” University of Medicine and Pharmacy, Faculty of Dental Medicine, Bucharest, Romania

2) University of Bucharest, Faculty of Physics, P.O.BOX MG-11, Magurele, Bucharest, Romania


E-mail
cataliniulian.berlic@g.unibuc.ro


Keywords:
dental restorative materials, drill, mill, SEM


Abstract:
Adhesion of modern restorative materials to dental tissues occurs via the hybrid layer created at the interface between the filling material and the dental tissue. Among other factors, the hybrid layer properties are influenced by the way of the preparation of the holes, practically by the way of the excavation inside in the damaged tissue. Classic drills used for the excision of the altered dentin are made of stainless steel, super-hard steel and tungsten carbide. By contrast, polymeric drills are made of polymeric materials with hardness greater than decayed dentine, but inferior to the healthy ones. Meanwhile, the dentin surface resulting from milling, which is involved and responsible for the occurrence of the hybrid layer, shows different characteristics from the use of two types of mechanical preparation. The present study is conducted in vitro on a number of 50 premolars and molars human teeth, which have cavities with altered dentine. The teeth were extracted from orthodontic or periodontal reasons. We used two groups of testing: in the first group, the excision of the altered dentine was made using stainless steel drill, while in the second group, we used polymer milling. The ultrastructural analysis of the prepared dentin surfaces by well-established techniques like SEM, showed significant differences in the appearance of the dentin wound between the studied groups.