Surfaces of cohesive bonds’ fracture in the multilayer systems: A comparative analysis

Studies of the fracturing surfaces on foreign material as a model object that binds a component to bone tissue have been carried out. Metal and ceramic brackets were used during operation. Brackets were fixed using the same materials under the identical conditions, according to the standard direct fixing procedure. Areas of the bone surfaces were investigated (when brackets removed) with the aid of scanning atomic force microscopy (AFM). The studied roughness was digitized owing to the ‘analysis’ microscope option. As a result, the average value of the fracture surface roughness was found (when removed) to be 241 nm for the metal bracket systems and 156 nm for the ceramic ones. Ultimately, the difference was more than one and a half. This is useful in practical medicine when choosing a bracket system.