Fracture Resistance of maxillary premolars Restored with Different Fiber-reinforced Composites: An In Vitro Study
Objective: To evaluate the fracture resistance of maxillary premolars weakened by MOD cavities and restored with nanohybrid composite, bulk fill composite and two fiber reinforced composites.
Materials and Methods: A total of 60 sound maxillary first premolars with standardized MOD cavities were used for this study, except for intact control. Specimens were randomly divided into six groups (n=10); G1: sound premolars (negative control); G2: unrestored teeth (positive control); G3: MOD cavities restored with nanohybrid composite. G4: MOD cavities restored with sonicfill bulk fill composite.; G5: MOD cavities restored with nanohybrid resin composite with glass fibers embedded into it from bucco-lingually.; G6: MOD cavities restored with short-fiber reinforced resin composite. All specimens were subjected to thermocycling between 5Cº to 55Cº in water bath for a total of 2000 cycle with 10 seconds dwell time. Then specimens were individually mounted on a computer-controlled material testing machine (Instron 3345) with a load cell of 5 kN and the maximum load to produce fracture in Newton (N) was recorded and statistical analysis was performed.
Results: Kruskall-Wallis test and Bonferroni-corrected Mann-Whitney U test showed that there was a statistically significant difference between the different study groups (P=0.000). Positive control and short fiber reinforced composite groups yielded the significantly highest mean values; followed by nanohybrid resin composite, sonic fill bulk fill composite and fiber reinforced composite groups that were statistically similar. While the negative control had the significantly lowest mean value.
Conclusion: The use of short fiber reinforced resin composite as restoration significantly increased the fracture strength of premolars with MOD restorations.
Haridy, Mohamed Fouad, "Fracture Resistance of maxillary premolars Restored with Different Fiber-reinforced Composites: An In Vitro Study" (2019). Dentistry. 43.