A modern fogászatban a fogtömések alkalmazása az egyik legelterjedtebb minimálinvazív eljárás. Az egyre fejlettebb kompozit tömőanyagoknak, adhezív rendszereknek és tömési technikáknak köszönhetően nagy szilárdságú, időtálló fogtöméseket lehet elkészíteni. Ezen restaurációk minősítése bonyolult feladat, a legelterjedtebb módszer a mikroszakító kötésszilárdsági vizsgálat, amelynek elvégzéséhez a próbatesteket kell kimunkálni és azokat egyedi befogókba ragasztani. Kutatásunk során három különböző ragasztóanyagot vizsgáltunk meg, hogy meghatározzuk, melyikkel célszerű a fémbefogóhoz ragasztani a dentint, és melyikkel az EverX dentinpótló kompozitot.
A fogászatban ma már mindennapos eljárásnak számít a fogak kompozit töméssel való ellátása. Ez a legtöbb esetben egyszerű és foganyagkímélő (minimálinvazív) beavatkozás, azonban a mély üregek tömése kihívást jelent. Kutatásunk során háromféle töméstípust vizsgáltunk: közvetlenül a fogban polimerizált kompozit tömést, közvetett módon az üregbe ragasztott (ún. semi-direct) tömést, illetve polietilén rosttal erősített kompozit tömést. Vizsgálataink során pásztázó elektronmikroszkóp segítségével figyeltük meg a fogtömés és a betömött üreg falai között keletkező réseket, illetve a résképződés mértékét, ezekből következtetve az egyes töméstípusok minőségére és várható tartósságára.
Dental fillings are one of the most widespread minimal invasive procedures in modern restorative dentistry. Thanks to the advantages of recently developed filling materials, adhesive systems, and filling techniques, it is possible to create high strength, long-lasting dental fillings. Qualifying these structures is a complicated procedure; the most common method is the use of a microtensile bond strength test, for which specimens need to be formed and stabilised with adhesives in special jigs. During our research, three different cyanoacrylates were examined to find the ideal adhesive for bonding the metal and dentin and the metal and EverX short fibre composite, respectively.
In dentistry, the use of dental fillings is a routine procedure. The use of fillings is a cheap, simple and low-harm dental operation, however, the filling of deep cavities is a difficult task. During this research, three types of fillings were tested: composite fillings bonded directly to the cavity walls, fillings bonded to the cavity walls with a semi-direct method, and composite fillings bonded to the cavity lined with polyethylene fibres. In the course of our examinations, the gaps between the wall of the dental cavity and the dental filling were observed using scanning electron microscopy. The results of these measurements can be used to determine the quality of each type of filling procedure.
Nowadays, short fiber-reinforced composites are broadly used in modern restorative dentistry. The tensile strength, Young's modulus, density, and polymerization shrinkage of these materials are developed to mimic the original teeth tissue best. The shrinkage, however, will occur during any polymerization process, which can cause residual stress and gap formation between the tooth and the filling. These can lead to the propagation of cracks, reduction in the adhesive bond strength, or even cause separation in the restoration. During this research, a biomimetic dental restoration was created on a surgically removed third molar with EverX short-fiber reinforced dental composite by bulk-filling technique. The restored tooth sample was examined by X-ray computed tomography to obtain a 3D image of the whole restoration. The volume of the used adhesive, the material discontinuities, and internal cavities were determined. A cut-out slice was further investigated by scanning electron microscopy to examine the adhesive layer thickness, the gap formation, and the quality of the filling. Finally, microtensile specimens were machined to evaluate the bond strength between the tooth dentin and the filling material.
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