Shearing force breaking the connection of selected polymers with deciduous tooth enamel after the exposure to ozone

Abstract

Si³a oecinaj¹ca zrywaj¹ca po³¹czenie wybranych polimerów ze szkliwem zêba mlecznego po ekspozycji na ozon Streszczenie -W warunkach dooewiadczalnych porównano wielkooeci si³y oecinaj¹cej, zrywaj¹cej po³¹czenie ze szkliwem zêba, poddanego lub niepoddanego ozonowaniu, polimerowych materia-³ów ³¹cz¹cych (XP Bond i Xeno III), zastosowanych z polimerem wype³niaj¹cym Dyract Extra. W badaniu wykorzystano 90 zêbów trzonowych mlecznych. Po oczyszczeniu powierzchni szkliwa 60 próbek poddano dzia³aniu ozonu (w tym 30 pokryto oerodkiem stymuluj¹cym remineralizacjê, uwalniaj¹cym jony F -), a wybrane polimerowe materia³y ³¹cz¹ce zastosowano zgodnie z instrukcj¹ producenta. Nastêpnie, na tak przygotowan¹ powierzchniê zêba nak³adano polimer wype³niaj¹cy Dyract Extra. Zmierzon¹ si³ê oecinaj¹c¹ przeliczono na powierzchniê kontaktu materia³u polimerowego ze szkliwem wyznaczaj¹c wartooeae si³y adhezji dla ka¿dej próbki. Zaobserwowano, ¿e ozonowanie szkliwa zêba mlecznego mo¿e w znacznym stopniu zwiêkszyae si³ê wi¹zania polimerów do jego powierzchni, natomiast zastosowanie po ozonowaniu oerodka stymuluj¹cego remineralizacjê zmniejsza wartooeae tej si³y. S³owa kluczowe: adhezja, polimery ³¹cz¹ce i wype³niaj¹ce, szkliwo zêba, ozon. SHEARING FORCE BREAKING THE CONNECTION OF SELECTED POLYMERS WITH DECI-DUOUS TOOTH ENAMEL AFTER THE EXPOSURE TO OZONESummary -The aim of this experimental examination was to compare the values of shearing force, which breaks the connection between polymer bonding agents (XP Bond and Xeno III), used with restorative polymer Dyract Extra, and enamel, after and without enamel's exposure to ozone. Ninety deciduous molars extracted for orthodontic reasons were used in the study. After cleaning the enamel surface, sixty samples were subjected to ozone treatment (among them thirty teeth were covered with a remineralisation agent releasing F -) (Fig. 1-3) and selected polymeric bonding agents were used according to the manufacturer's instructions (Table 1). Prepared in this way, enamel was covered with Dyract Extra polymeric restorative material. The measured shearing force was calculated per contact surface of the material and enamel. As a result the value of adhesive strength was calculated for every sample. It was observed that ozonating the deciduous tooth's enamel can significantly increase the adhesion of polymers to its surface, whereas the application of a remineralisation agent after the ozonating decreases the value of the adhesive strength (Table 2).

Morphological changes in the surface of enamel of primary teeth after application of ozone gas

“…However the value of indicator R z was found to be almost two times greater in group 6 than in group 5. This looks to be an interesting finding because a previous study [12] sets a higher growth of the adhesive force in the case of self-etching bonding agent after previous ozone gas application to enamel in comparison to bonding agent requiring initial acid etching and experimental ozone gas application. It can be supposed that, in developing the enamel surface, the most important point is the existence of high absolute differences between the highest top and lowest grooves of the surface roughness profile.…”

“…It was also stated that ozoning of deciduous teeth before etching their enamel with 36 % H 3 PO 4 and applying bonding agent containing acidic monomers increases the bonding force of polymers to enamel tissue. In the case of a polymer bonding agent requiring tissue preparation with acid, the adhesion force had an increased average value of 5.05 ± 0.47 MPa to 5.41 ± 0.52 MPa, and respectively for polymer bonding agent containing acidic monomer from 3.13 ± 0.48 MPa to 3.79 ± 0.54 MPa [12]. The results of this study allow us to propose a hypothesis that the use of ozone gas provides beneficial changes in the aprismatic enamel surface.…”