Uticaj tipa bravice i vremena nagrizanja na jačinu adhezivne veze za gleđ - in vitro studija
Uticaj tipa bravice i vremena nagrizanja na jačinu adhezivne veze
Sažetak
Uvod. Cilj ovog istraživanja bio je da se uporedi čvrstoća na smicanje između dva različita tipa metalnih bravica vezanih za površinu gleđi nagrizane kiselinom u dva različita vremena.
Materijali i metode. Četrdeset ekstrahiranih ljudskih pretkutnjaka je nasumično podeljeno u 4 grupe. U grupama 1 i 2 metalne bravice Topic (Dentaurum, Nemačka) su aplikovane nakon nagrizanja 37% fosfornom kiselinom (Gel, Reliance, USA) u trajanju od 15 i 30 s, dok su u grupama 3 i 4 metalne bravice Ekvilibrijum mini (Dentaurum, Nemačka) aplikovane takođe nakon nagrizanja od 15 i 30 s. Bravice su zalepljene korišćenjem tečnog kompozita Heliosit Orthodontic (Ivoclar Vivadent, Lihtenštajn) i svetlosno polimerizovane korišćenjem LED lampe. Jačina adhezivne veze je merena elektronskim dinamometrom pri brzini poprečne glave od 5 mm/min.
Rezultati. Statistička analiza je pokazala da na jačinu adhezivne veze utiču i tip bravice (t=10,62; p<0,01) i vreme nagrizanja (t=2,81; p=0,008). Ekvilibrijum mini bravice sa prethodnim nagrizanjem gleđi u trajanju od 30 s su pokazale najveće vrednosti 10,8 ± 0,75 MPa, dok su Topic bravice sa prethodnim nagrizanjem gleđi od 15 s pokazale najniže vrednosti 4,85 ± 0,53 MPa.
Zaključak. Produženo vreme nagrizanja zubne gleđi rezultira većom jačinom adhezivne veze, posebno kada se koristi bravica sa manjom bazom.
Reference
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