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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).
Key words: composite, glass ionomer cement, adhesive, dentin,
email, bond strength, SEM
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