Dentist № 3 (46) – 2022, pp. 55-59                                                                                                                  НАУЧНЫЕ ПУБЛИКАЦИИ

The possibility of obtaining the uniform distribution of particles of inorganic fillers in the polymer filling materials

L.Yu. Orekhovaa, I.N. Antonovab, V.D. Goncharovc, R.V. Yashkardind, A.Yu. Kropotinae

aMD, PhD, DMSci, Professor, Academician I.P. Pavlov First St. Petersburg State Medical University, City Periodontal Center «PAKS» Ltd., Saint Petersburg, Russia
b MD, PhD, DMSci, Professor, Academician I.P. Pavlov First St. Petersburg State Medical University, Saint Petersburg, Russia
cPhD, DSc (Technology), Professor, Saint-Petersburg state electrotechnical University “LETI”. V. I. Ulyanov (Lenin), Saint Petersburg, Russia
dPhD in Technology Science, Associate Professor, Saint-Petersburg state electrotechnical University “LETI”. V. I. Ulyanov (Lenin), Saint Petersburg, Russia
eMD, PhD, Associate Professor, Academician I.P. Pavlov First St. Petersburg State Medical University, Saint Petersburg, Russia

https://doi.org/10.32993/dentist.2022.3(46).3

ABSTRACT
The aim of the study. Improving the quality of composite filling materials containing fine fillers.
Objects and methods. Light-curing, radiopaque, fine-grained hybrid composite filling materials were subjected to ultrasonic action in different periods of time in order to obtain a homogeneous structure with a specially designed ultrasonic unit with an operating frequency of 44 kHz in a pulse-periodic mode. Using atomic force microscopy (AFM) in semi-contact mode, the phase contrast technique was used to study the distribution of highly dispersed fillers in filling materials, as well as “smoothness” of surface of the filling from this material, which was compared with surface heterogeneities of various teeth.
Results and discussion. The results indicate that for each of the studied materials there is its own minimum time sufficient for homogenization. Exposure to ultrasound significantly affects the distribution of highly dispersed fillers in material, leading to the destruction of agglomerates and a uniform distribution of particles throughout the volume of filling material. This leads to the fact that height of inhomogeneities of seal surface from the material treated with ultrasound decreases by almost 2 times and the studied seal surface is smoother.
Conclusion. Highly dispersed fillers form agglomerates several microns in size during storage. Agglomerates of nanoparticles form regions with significantly higher mechanical properties, as a result of which inhomogeneities appear during surface treatment. With the help of ultrasonic vibrations, it is possible to “break” agglomerates of highly dispersed fillers of composite filling materials.

Keywords: composite materials, highly dispersed fillers, atomic force microscope, surface of filling materials, agglomerates

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Correspondence to:  Е-mail: prof_orekhova@mail.ru