ABSTRACT
Objective: The aim was to evaluate the effect of different adhesive systems and surface treatments
on the integrity of resin-resin and resin-tooth interfaces after partial removal of
preexisting resin composites using quantitative image analysis for microleakage testing
protocol. Materials and Methods: A total of 80 human molar teeth were restored with either of the resin composites
(Filtek Z250/GrandioSO) occlusally. The teeth were thermocycled (1000×). Mesial and
distal 1/3 parts of the restorations were removed out leaving only middle part. One
side of the cavity was finished with course diamond bur and the other was air-abraded
with 50 μm Al2O3. They were randomly divided into four groups (n = 10) to receive: Group 1: Adper Single Bond 2; Group 2: All Bond 3; Group 3: ClearfilSE;
Group 4: BeautiBond, before being repaired with the same resin composite (Filtek Z250).
The specimens were re-thermocycled (1000×), sealed with nail varnish, stained with
0.5% basic fuchsin, sectioned mesiodistally and photographed digitally. The extent
of dye penetration was measured by image analysis software (ImageJ) for both bur-finished
and air-abraded surfaces at resin-tooth and resin-resin interfaces. The data were
analyzed statistically. Results: BeautiBond exhibited the most microleakage at every site. Irrespective of adhesive
and initial composite type, air-abrasion showed less microleakage except for BeautiBond.
The type of initial repaired restorative material did not affect the microleakage.
BeautiBond adhesive may not be preferred in resin composite repair in terms of microleakage
prevention. Conclusions: Surface treatment with air-abrasion produced the lowest microleakage scores, independent
of the adhesive systems and the pre-existing resin composite type. Pre-existing composite
type does not affect the microleakage issue. All-in-one adhesive resin (BeautiBond)
may not be preferred in resin composite repair in terms of microleakage prevention.
Key words:
Adhesive System - composite repair - microleakage - surface treatment
