Which restorative material  is the best before the tooth preparation?

The aim of in-vitro study was to  evaluate the microleakage of different restoratif materials before tooth preparation. 

Method:

Thirty maxillary central incisor teeth were selected and  divided into three groups (n = 10):  Group DEC: DyractExtra Compomer (Dentsply); Group EWB: Embrace Wet Bond flowable composite (PulpDent); Group NHC: Nano-hybrid composite Grandio (Voco). The Class V cavities were prepared on cervical third of  buccal surface. Enamel surfaces of all teeth were etched with 37% phosphoric acid for 30 sn before the bonding procedures. After polishing, the teeth were stored in distilled water at 37°C for 30 days, immersed in a 0,5%  basic fuchsine, and then longitudinally sectioned. Dye penetration was measured with a stereomicroscope at  x50 magnification at both coronal and gingival margins. The microleakage values were measured in milimeter (mm) unit and  analyzed by ANOVA/Tukey tests for among the groups.

Result:

The results showed that there is significantly  differences among groups (ANOVA, p < .046). The microleakage values  ( mean ± SD; mm) in the groups were as follows: Group DEC, 0.55 ± 0.25; Group WEB, 0.26 ± 0.13; Group NHC, 0.30 ± 0.10. The highest microleakage value were achieved with group DEC. 

Conclusion:

Before the  tooth preparation, the using of flowable composite in the Class V cavity  can be recommended as a suitable restorative material.