[Comparison of wear resistance and flexural strength of three kinds of bulk-fill composite resins].
OBJECTIVE
To compare the abrasion resistance and flexure strength of three bulk-fill resin composites with an universal nano-hybrid composite resins.


METHODS
The specimens were prepared with three kinds of bulk fill composites (SDR , sonicfill, Tetric N-Ceram Bulk Fill) and an universal nano-hybrid composite resins(Herculite Precis). 10 mm in diameter × 2mm in height specimens were prepared for abrasion resistance, while 2 mm in width × 2 mm in depth×25 mm in length specimens were prepared for flexure strength. The specimens were mounted in a bal1-on-disc wear testing machine and abraded with the media artificial saliva(50 N loads, 10000 cycles).Flexural test was performed with an Universal Testing Machine at a cross-head speed of 1mm/min. One-way variance analysis was used to determine the statistical differences of volume loss and flexural strength among groups with SPSS 13.0 software package(P<0.05).


RESULTS
The volume loss was as follows: SDR (1.2433±0.11) mm3<sonicfill (0.6331±0.09) mm3<Tetric N-Ceram Bulk Fill（0.3558±0.05） mm3 <Herculite Precis（0.3097±0.04） mm3. The flexural strength was as follows: sonicfill (136.2184±16.70) MPa<Herculite Precis(124.1468±19.96) MPa<Tetric N-Ceram Bulk Fill (119.2082±20.32) MPa< SDR(103.6246±7.13) MPa. There was no significant difference between Tetric N-Ceram Bulk Fill and Herculite Precis either in volume loss or flexural strength(P>0.05).


CONCLUSIONS
With regard to wear resistance and flexural strength, Tetric N-Ceram Bulk Fill is recommended as an alternative for posterior restorations.
Department of Endodontics, School of Stomatology, China Medical University. Shenyang 110002, Liaoning Province, China. E-mail:406470854@qq.com.
Huan
H
Zhang
Meng-Long
ML
Zhang
Li-Hong
LH
Qiu
Jing-Tao
JT
Yu
Fu-Liang
FL
Zhan
D003188:Composite Resins; D003764:Dental Materials; D006801:Humans; D008422:Materials Testing
D003188:Composite Resins; D003764:Dental Materials; C121818:Tetric ceram