Original Research Article
Year: 2018 | Month: March | Volume: 8 | Issue: 3 | Pages: 105-112
Cuspal Deflection and Fracture Resistance in Maxillary Premolar Teeth Restored With Bulk-Fill Flowable Resin-Based Composite Materials
Mohammed S. Almuhaiza1, Nashaat M. Magdy2
1Associate Professor, 2Assistant Professor,
Conservative Dental Science, College of Dentistry, Prince Sattam Bin Abdullaziz University, KSA
Corresponding Author: Nashaat M. Magdy
Objectives: To evaluate cuspal deflection and fracture resistance of maxillary premolars with class II MOD cavities filled with nanohybrid resin composites lined with SDR or nano flowable resin composite.
Methods: 30 MOD cavities were prepared in extracted human upper premolar teeth. The cavities (n=10) were restored and grouped into three groups. Group I was restored with nanohybrid RBC (Esthet.x-HD), group II was restored with Esthet.x-HD/SurFil SDR flowable composite and group III was restored with Esthet.x-HD/Filtek z350 XT flowable composite. Buccal and palatal cusp deflections were recorded post irradiation using strain-gauge device. All of the specimens subjected to a compressive load in a universal Instron Testing Machine at a crosshead speed of 0.5mm⁄min until fracture was occurred.
Results: There were a high significant difference (p<0.0001) between the tested groups.
Conclusions: SDR as 4 mm bulk fill dentin replacement showed good performance as a liner under nano hybrid composite resin restorations.
Key words: Nano-hybrid resin composite, Bulk Fill, Flowable liner, cuspal deflection, fracture resistance