Evaluationof Curing Depth of Bulk-Fill Resin Composite (A comparative study)


This study evaluated the depth of cure (DOC) of recently introduced resin composites for posterior use, bulk filled flowable composite (SureFil® SDR® flow DENTSPLY Caulk) at different depth. 30 specimens were prepared and divided into two Groups,Group 1: specimens with 2 mm depth, Group 2: specimens with 4mm depth. The composite specimens were prepared by using molds of different depth, one of them with was a hole of 4 mm depth and 4 mm internal diameter and the other was with a depth of 2 mm at the same diameter. The hole was bulk filled with SDR flowable composite resin and light cured for 20 seconds with a modern high-intensity LED curing unit (Elipar™ S10, 3M.US.), followed by 24 hours storage in complete darkness incubator at 37 C◦. The degree of conversion was measured on the top and the bottom for both depths using Fourier transform infrared (FTIR) spectroscopy. A bulk filled flowable (SDR)revealed a significant difference in degree of conversion (DOC) when the bottom surface of the specimen witha 2mm depth (DOC=76.27112163) wascompared with the bottom surface of the 4mm depth specimen (DOC=73.92160935). The 2mm depth wasshown statistically significantly higher mean values degree of conversion than 4 mm depth (P-value = 0.032). There was no statistically significant difference in the degree of conversion mean values between the top and the bottom surfaces of the specimen of the same group (P >0.05).Upon the result of thisin vitro study, it was found that the degree of conversion of the SDR bulk-fill flowable resin compositewasaffected by depths. As the depth of the resin compositewas increased the degree of conversion was decreased.