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

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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
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.


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

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