Smična čvrstoća ortodontskih bravica vezanih na cirkonijoksidne krunice
| Autor: | Bleron Azizi, Željko Alar, Donika Iljazi-Shahiqi, Sandra Anić-Milošević, Jeta Kelmendi, Blerim Mehmeti |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
Materials science
Shear Bond Strenght Orthodontic Brackets chemistry.chemical_element posmična čvrstoća veze ortodontske bravice dentalno odljepljivanje Original Scientific Paper(s) Shear Bond Strength Dental Debonding 02 engineering and technology 03 medical and health sciences 0302 clinical medicine Ortodontic Brackets Ceramic Composite material General Dentistry Universal testing machine Zirconium Bond strength Significant difference 030206 dentistry 021001 nanoscience & nanotechnology Shear bond lcsh:RK1-715 Orthodontic brackets chemistry lcsh:Dentistry visual_art visual_art.visual_art_medium 0210 nano-technology |
| Zdroj: | Acta Stomatologica Croatica, Vol 51, Iss 2, Pp 99-105 (2017) Acta stomatologica Croatica : International journal of oral sciences and dental medicine Volume 51 Issue 2 Acta Stomatologica Croatica |
| ISSN: | 0001-7019 1846-0410 |
| Popis: | Sve češća potražnja za estetskim restauracijama rezultirala je povećanim korištenjem potpuno keramičkih dentalnih nadomjestaka, primjerice onih od cirkonijeva oksida. Time se pojavljuje izazov osiguravanja vezne čvrstoće ortodontskih bravica na različite keramičke materijale. Na snagu veze može utjecati vrsta bravice, odnosno materijal od kojega je izrađena i površina njezine baze ili način retencije. Svrha rada: Željela se provesti komparativna analiza posmične čvrstoće metalnih i keramičkih ortodontskih bravica zalijepljenih na cirkonij-oksidnu keramičku površinu kakva se nalazi na protetičkim nadomjestcima, te procijeniti način loma tih dviju vrsta ortodontskih bravica. Materijali i metode: Pripremljeno je 20 uzoraka/polukrunica od keramike na koje su zalijepljene ortodontske bravice – 10 metalnih i 10 keramičkih. Posmični test obavljen je u univerzalnoj kidalici s opterećenjem uzrokovanim klipom oštrog vrha koji se kretao pri fiksnoj brzini od 1 mm/min do loma. Sila potrebna za odljepljivanje bravica bilježena je u Newtonima, nakon čega je posmična čvrstoća izračunata u MP-ima. Osim toga, uzorci su analizirani pod digitalnim mikroskopom kako bi se ustanovio indeks ostatka ljepila (ARI). Statistički podatci obrađeni su t-testom, a razina značajnosti postavljena je na α = 0,05. Rezultati: Pokazali su da je vezna čvrstoća metalnih bravica vezanih na cirkonij-oksidne krunice veća u usporedbi s keramičkim bravicama sa statistički značajnom razlikom. Tijekom istraživanja dvije keramičke bravice su djelomično ili potpuno oštećene. Zaključak: Čini se da metalne bravice u usporedbi s keramičkima stvaraju jaču vezu s cirkonij-oksidnim površinama zbog boljeg načina retencije. Keramičke bravice su i krhkije tijekom uklanjanja. An increasing demand for esthetic restorations has resulted in an increased use of all-ceramic restorations, such as zirconium. However, one of the challenges the orthodontist must be willing to face is how to increase bond strength between the brackets and various ceramic restorations. Bond strength can be affected by bracket type, by the material that brackets are made of, and their base surface design or retention mode. The aim of this study was to perform a comparative analysis of the shear bond strength (SBS) of metallic and ceramic orthodontic brackets bonded to all-zirconium ceramic surfaces used for prosthetic restorations, and also to evaluate the fracture mode of these two types of orthodontic brackets. Material and methods: Twenty samples/semi-crowns of all-zirconium ceramic, on which orthodontic brackets were bonded, 10 metallic and 10 ceramic polycrystalline brackets, were prepared for this research. SBS has been tested by Universal Testing Machine, with a load applied using a knife edged rod moving at a fixed rate of 1 mm/min, until failure occurred. The force required to debond the brackets was recorded in Newton, then SBS was calculated to MPa. In addition, the samples were analyzed using a digital camera magnifier to determine Adhesive Remnant Index (ARI). Statistical data were processed using t-test, and the level of significance was set at α = 0.05. Results: Higher shear bond strength values were observed in metallic brackets bonded to zirconium crowns compared to those of ceramic brackets, with a significant difference. During the test, two of the ceramic brackets were partially or totally damaged. Conclusion: Metallic brackets, compared to ceramic polycrystalline brackets, seemed to create stronger adhesion with all-zirconium surfaces due to their better retention mode. Also, ceramic brackets showed higher fragility during debonding. |
| Databáze: | OpenAIRE |
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