Evaluation of Gingival Microleakage in Class II Composite Restorations with Different Lining Techniques: An In Vitro Study

Abstract EN

Aim.

To compare the microleakage in class II composite restorations without a liner/with resin modified glass ionomer and flowable composite liner.

Method.

Forty standardized MO cavities were prepared on human permanent mandibular molars extracted for periodontal reasons and then divided into 4 groups of ten specimens.

The cavity preparations were etched, rinsed, blot dried, and light cured and Adper Single Bond 2 is applied.

Group 1 is restored with Filtek P60 packable composite in 2 mm oblique increments.

Group 2 is precure group where 1 mm Filtek Z350 flowable liner is applied and light cured for 20 sec.

Group 3 is the same as Group 2, but the liner was cocured with packable composite.

In Group 4, 1 mm RMGIC, Fuji Lining LC is applied and cured for 20 sec.

All the teeth were restored as in Group 1.

The specimens were coated with nail varnish leaving 1 mm around the restoration, subjected to thermocycling, basic fuchsin dye penetration, sectioned mesiodistally, and observed under a stereomicroscope.

Results.

The mean leakage scores of the individual study groups were Group 1 (33.40), Group 2 (7.85), Group 3 (16.40), and Group 4 (24.35).

Group 1 without a liner showed maximum leakage.

Flowable composite liner precured was the best.