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2008, vol. 24, br. 58, str. 813-820
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SEM procena i snaga vezivanje između površine adhezivnog sistema i glass jonomer cementa - sendvič tehnika
SEM evaluation and shear bond strength of the interface of adhesive system and glass ionomer cement: Sandwich restoration
aStomatološki fakultet, Odeljenje za bolesti zuba, Skopje, Makedonija
bUniverzitet u Nišu, Medicinski fakultet, Stomatološka klinika
Sažetak
U osnovi mnogih restauracionih procedura zadatak je postići vezu između dve različite površine: mineralizovane zubne površine i restauracionog materijala. Savremeni zahtevi restauracije tvrdih zubnih tkiva su za primenu adhezivnih, fizičko-hemijski kao i biokompatibilnih restauracionih materijala. Cilj ove, in vitro, studije je da se uporedi površina i snaga vezivanja, između tvrdog zubnog tkiva, sa jedne strane i adhezivnog sistema, odnosno glas jonomer cementa, sa druge strane. Za izradu eksperimenta upotrebili smo 52 humana, intaktna zuba ekstrahirana iz ortodontskih razloga. Uzorke zuba smo podelili u 2 grupe u odnosu na način primene: I grupa: na 20 prepariranih tvrdih zubnih tkiva (gleđ i dentin) postavili smo adhezivni sistem i kompozit po preporuci proizvođača (37% Fosforna kis, Excite, Tetric Ceram) i II grupa: na 20 prepariranih tvrdih zubnih tkiva prvo smo postavili podlogu od glas jonomera (Fuji IX) a zatim adhezivni sistem i kompozit, kao kod prve grupe. 40 zubnih uzoraka su upotrebljeni za merenje snage adhezivne veze i to dvadeset između tvrdih zubnih tkiva (gleđ i dentin) i adhezivnog sistema (37% Fosforna kis.,Excite, Tetric Ceram), i dvadeset uzorka zuba sa sendvič restauracijom (Fuji IX, 37% Fosforna kis.,Excite, Tetric Ceram). 12 (6 sa adhezivnim sistemom i kompozitom i 6 sa sendvič restauracijom), posmatrani su na skening elektronskom mikroskopu (SEM) i napravljeni su snimci. Na snimcima je registrovano prisustvo/odsustvo mikroprostora između adhezivnog sistema, kompozitnog materijala sa jedne strane i zubnih tkiva ili glas jonomer cementa (Fuji IX) sa druge strane. Rezultati: Jačina adhezivne veze koje smo dobili za vezivanja zuba tretiranih sa adhezivnim sistemom i kompozitom (37% Fosforna kis., Excite, Tetric Ceram) je 3,33 - 10,31MPa, dok je slabija adhezivna veza pokazala sendvič restauracija sa glas-jonomerom i kompozitom (Fuji IX, 37% Fosforna kis., Excite, Tetric Ceram) 2,34-8,82MPa.
Abstract
Background: Basic objective of many restoration procedures is to make adhesion between two different surfaces: the mineralized dental surface and the restoration material. The modern concept of restorative techniques at dental hard tissue prefer use of adhesives, physically-chemical and biocompatibility materials. Aim of this, in vitro, study is to compare the surfaces and also the strength of bonding between hard dentine tissue and adhesive system from one side, and glass ionomer cement from another side. Material and methods: For this experiment we used 52 human, intact teeth, extracted because of orthodontic reasons. Depending of the way of preparing we divided the teeth samples in two groups, • I group: At 20 teeth we performed preparation of hard dentine tissue (enamel and dentine). After we apply adhesive system and composite, according to manufacturer's instruction (37% Phosphoric acid, Excite and Tetric Ceram) • II group: At another 20 teeth, after preparation of hard dentine tissue we apply base from glass ionomer (Fuji IX) and than adhesive system and composite (sandwich technique). At all 40 samples were measure the shear bond strength of adhesive system. Other 12 teeth samples (6 each group), after debonding we observed with SEM (scanning electronically microscope). Results: The shear bond strength of the adhesive sealing was 3,33- 10,31 MPa, and 2,34 - 8,82MPa, respectively. At one SEM picture from first group, and two at second group, we obtain presence of micro-leakage; between adhesive system and composite material, and between hard dental tissue and glass ionomer cement (Fuji IX).
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