期刊
JOURNAL OF DENTAL RESEARCH
卷 83, 期 12, 页码 930-935出版社
SAGE PUBLICATIONS INC
DOI: 10.1177/154405910408301208
关键词
dental resin composite; nano-silica-fused whiskers; wear; mechanical properties; mechanisms
资金
- NIDCR NIH HHS [R29 DE12476] Funding Source: Medline
Resin composites must be improved if they are to overcome the high failure rates in large stress-bearing posterior restorations. This study aimed to improve wear resistance via nano-silica-fused whiskers. It was hypothesized that nano- silica-fused whiskers would significantly improve composite mechanical properties and wear resistance. Nano-silicas were fused onto whiskers and incorporated into a resin at mass fractions of 0%- 74%. Fracture toughness ( mean +/- SD; n = 6) was 2.92 +/- 0.14 MPa . m(1/2) for whisker composite with 74% fillers, higher than 1.13 +/- 0.19 MPa . m(1/2) for a prosthetic control, and 0.95 +/- 0.11 MPa . m(1/2) for an inlay/onlay control (Tukey's at 0.95). A whisker composite with 74% fillers had a wear depth of 77.7 +/- 6.9 mum, less than 118.0 +/- 23.8 mum of an inlay/onlay control, and 172.5 +/- 15.4 mum of a prosthetic control ( p < 0.05). Linear correlations were established between wear and hardness, modulus, strength, and toughness, with R = 0.95-0.97. Novel nano- silica-fused whisker composites possessed high toughness and wear resistance with smooth worn surfaces, and may be useful in large stress-bearing restorations.
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