The Effect of Different Liners on the Microleakege of Class II Restorations after Thermocyclign and Occlusal Loading

Suat ÖZCAN, İhsan YIKILGAN, Oya BALA, Mine Betül ÜÇTAŞLI, Hüma ÖMÜRLÜ
904 1.026

Abstract


Objective: We evaluated in vitro marginal adaptation of class II
resin composite restorations with and without a liner.
Materials and Methods: In total, 48 extracted sound human
mandibular molars were used. The teeth were prepared following
a standardized pattern for a class II cavity. The teeth were then
randomly divided into four groups of 12 teeth each: group 1: resinmodified
glass ionomer liner (RMGI) + composite resin (CR),
group 2: flowable composite liner + CR, group 3: self-adhesive
flowable composite liner + CR, and group 4: CR. The specimens
were thermocycled and loaded with a mechanical loading device.
The methylene blue dye penetration test was used to evaluate
microleakage.
Results: When specimens were evaluated for occlusal and gingival
microleakage, the resin-modified and flowable composite groups
showed significantly less microleakage than the control group with
no liner. The self-adhesive flowable composite group showed no
significant improvement.
Conclusions: Flowable composite and RMGI liners were useful in
decreasing microleakage, but the self-adhesive flowable composite
liner showed no significant advantage.


Keywords


Microleakage, liner, occlusal loading, self-adhesive flowable composite, thermocycling

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