الفهرس 
Title : Microhardness and fracture resistance of sonic-fill versus bulk-fill resin composite restorations
ContentOnly 14 pages are availabe for public view
 |  | from | 129 |  |  |
| | | from | 129 | | |
Abstract
The aim of the present study was to determine the effect of sonic vibration on the microhardness and fracture resistance of Sonic-Fill (Kerr) and X-tra fil (Voco) bulk-Fill resin composite restorations after aging for 24 hours and 12 months. A total number of 80 standardized MOD cavities were prepared in 80 maxillary premolars. The teeth were randomly divided into two equal groups, of 40 teeth each, according to the material; either SonicFill resin or X-tra Fil resin composite. Each group was divided into two equal subgroups, of 20 teeth each, according to sonic vibration applied; either application of resin composite using sonic vibration or without sonic vibration. Each subgroup was divided into 2 classes, of 10 teeth each, according to the aging duration; either after 24hours or12 months in artificial saliva at 37{u25E6}C. Five teeth from each class were used for microhardness testing and the other five were assigned for fracture resistance testing. An extra group of five unprepared teeth was used as sound Control for fracture resistance test. In all specimens Single Bond universal adhesive (3M ESPE) was applied following manufacturer{u2019}s directions in selective-etch mode, followed by placement of SonicFill and X-tra Fil materials in bulk (5mm)