847 Mechanical Properties of Flowable Composite Resins and a Giomer

Friday, March 23, 2012: 2 p.m. - 3:15 p.m.
Presentation Type: Poster Session
V.K. KALAVACHARLA, R. ROBLES, Q. CAI, D. CAKIR, P. BECK, L. RAMP, and J. BURGESS, University of Alabama at Birmingham, Birmingham, AL

Objectives: To measure and compare compressive strength, yield strength and wear resistance of a giomer, BEAUTIFIL Flow Plus, to flowable composite resins, PREMISE hybrid and SureFil SDR flowable.

Methods: Compressive and yield strength: Specimens (n=10) were prepared using a Teflon split mold (d=4mm/h=8mm) following manufacturers' instructions for light curing (Elipar S10/3M ESPE/1100mW/cm) and stored (distilled water/370C/24hours). They were placed vertically between the hard steel plates of an Instron (Model/5565) and a compressive load applied (0.75mm/min) until failure. Compressive and yield strength was calculated from the stress strain curve created by the Instron Software.

Wear resistance: Eight flat disc specimens (n=8) of each material (d=10mm/h=2mm) were prepared in 2mm increments using a flexible mold following manufacturers' instructions, light-cured (Elipar S10/3M ESPE/1100mW/cm2) and stored (distilled water/370C/24hours). They were mounted in brass holders (d=15mm/self-cured acrylic), polished (600-, 1000- and 1200- grit SiC paper) and finished (0.05 alumina slurry+polishing cloth). A load of 75N applied using stainless steel tips (d=4.70mm) for 200,000 cycles/1.2Hz in the Alabama Wear machine with 50 PMMA beads as media. Surfaces were scanned using a non-contact 3D profilometer (PROSCAN2000/Scantron/UK) and superimposed (ProForm/Scantron/UK) to determine wear depth and volume. Data was analyzed using ANOVA and Tukey/Kramer post-hoc tests (p=0.05).

Results: (MeanSD) Same letters are not statistically different (p>0.05)

Material/Manufacturer

Wear

Compressive and Yield Strength (MPa)

Volume (mm³)

Depth (m)

Beautifil Flow Plus F00/SHOFU

0.0310.006A,C

94.78A

178.836A,C

Beautifil Flow Plus F03/SHOFU

0.0430.007A,B

106.815A,C

185.927A,B,C

Premise hybrid/KERR

0.0310.016A,C

64.118B

115.323D

SureFil SDR/DENTSPLY

0.0520.005B

126.69C

16225C

 

Conclusions: Within the limitations of this study, Beautifil Flow Plus F03 and F00 showed similar compressive strength, yield strength and wear with commercially available flowable composites. They also showed similar wear properties with Hybrid material. Funded in part by a grant from Shofu Dental Corporation .

 


Keywords: Biomaterials, Composites and Wear