Comparative ultrastructural analysis of dentin surfaces mechanically prepared using carbon steel conventional burs and polymer burs

作者：Gheorghiu Irina Maria^*; Marascu Valentina; Staicu Dumitru; Zmarandache Daciana; Perlea Paula

来源：Romanian Biotechnological Letters, 2017, 22(4): 12775-12784.

• carbon steel burs
• polymeric burs
• dentine surface
• AFM
• plasma

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. The physical characteristics of the remaining dentin surface through which dentinal adhesion is realized are influenced by the method of cavity preparation, basically the technique that is used to remove caries-infected tissues. The present study is conducted in vitro on a total of 20 premolar and molar human teeth which have cavities with altered dentine. Teeth were extracted from orthodontic or periodontal reasons. We used two groups of tests: in group A, the excision of the altered dentine was made by means of stainless steel burs, while in the group B polymer burs were employed. Optical microscopy and AFM (Atomic Force Microscopy) techniques were used for analyzing the prepared dentin surfaces. Using a CC (Continuum Current) plasma reactor we studied the possibility of removing the smear layer debris which is present on the dentin surface after using dental burs. The ultrastructural analysis of the prepared dentin surfaces by well-established techniques like optical microscopy and AFM showed significant differences in the morphology of the samples from the two test groups. Each method of dentine excavation determines different characteristics of its surface, thus influencing the bond strength of dental adhesives.

• 出版日期2017-8