RF Safe

Mechanical properties of resin composites with filler particles aligned by an electric field.

Dental materials : official publication of the Academy of Dental Materials · 1998 · Benefit · Low evidence

← Research stream
BenefitLow evidencePaper 4061

Silica-zirconia filler particles were aligned in resin composites using a 60 Hz AC electric field prior to photopolymerization. Aligned composites showed elastic modulus increases up to about 20% and higher maximum compressive stress before significant deform…

Study snapshot

PublicationDental materials : official publication of the Academy of Dental Materials · 1998
Study typeengineering
Reported directionBenefit
Evidence ratingLow

Abstract

OBJECTIVES: To explore possible enhancement of the mechanical properties of resin composites by aligning the filler particles. METHODS: The resin for the composites consisted of urethane dimethacrylate (UDMA) and 1,6-hexanediol dimethacrylate (HDDMA) mixed in the ratio of 90 to 10; the filler was silica-zirconia in two particle sizes, 1.7 microns (P50), which was mixed with the resin in the volume fractions of 29 and 48 vol%, and 0.7 micron (Z100), which was mixed with the resin in the volume fractions of 37 and 57 vol%. Particle alignment was obtained by applying a 60 Hz AC electric field across the composite before the resin was photopolymerized. The stress-strain behavior and the elastic modulus of the hardened composite were measured along the alignment axis in compression. RESULTS: The elastic moduli of the aligned composites increased by as much as 20%, and the maximum stress sustainable in compression before significant deformation occurred was elevated. An electric field strength of the order of 1 kV mm-1 was required to obtain sufficient alignment. SIGNIFICANCE: Besides conferring a structure to resin composites that is more like that of the natural tooth, particle alignment increased some of the mechanical properties and may have improved durability.

Machine Enhanced Logic

AI evidence extraction

Structured fields below were generated from the paper’s abstract and metadata to make the evidence easier to inspect. Automated extraction may be incomplete or incorrect; verify important details against the original paper.

Study typeengineering
Effect directionbenefit
PopulationNot supplied
Sample sizeNot supplied
ExposureELF
Evidence strengthLowConfidence: 74% · Peer reviewed: yes

Main findings

Silica-zirconia filler particles were aligned in resin composites using a 60 Hz AC electric field prior to photopolymerization. Aligned composites showed elastic modulus increases up to about 20% and higher maximum compressive stress before significant deformation; field strength on the order of 1 kV/mm was reported as required for sufficient alignment.

Outcomes measured

  • Elastic modulus
  • Compressive stress/maximum sustainable stress before significant deformation
  • Stress-strain behavior

Limitations

  • No sample size reported in abstract
  • No details provided on experimental replication/variability or statistical testing in abstract
  • Exposure duration and exact field parameters beyond frequency and approximate strength not reported in abstract
View raw extracted JSON
{
  "study_type": "engineering",
  "exposure": {
    "band": "ELF",
    "source": "other",
    "frequency_mhz": null,
    "sar_wkg": null,
    "duration": null
  },
  "population": null,
  "sample_size": null,
  "outcomes": [
    "Elastic modulus",
    "Compressive stress/maximum sustainable stress before significant deformation",
    "Stress-strain behavior"
  ],
  "main_findings": "Silica-zirconia filler particles were aligned in resin composites using a 60 Hz AC electric field prior to photopolymerization. Aligned composites showed elastic modulus increases up to about 20% and higher maximum compressive stress before significant deformation; field strength on the order of 1 kV/mm was reported as required for sufficient alignment.",
  "effect_direction": "benefit",
  "limitations": [
    "No sample size reported in abstract",
    "No details provided on experimental replication/variability or statistical testing in abstract",
    "Exposure duration and exact field parameters beyond frequency and approximate strength not reported in abstract"
  ],
  "evidence_strength": "low",
  "confidence": 0.74,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "resin composites",
    "dental materials",
    "filler particle alignment",
    "electric field",
    "60 Hz",
    "AC electric field",
    "elastic modulus",
    "compression"
  ],
  "suggested_hubs": []
}
AI can be wrong. Always verify against the paper.

AI-extracted fields are generated from the abstract and metadata and may be incomplete or incorrect. This material is for informational purposes and is not medical advice.

Identifiers and source

DOI: 10.1016/s0300-5712(99)00011-1
PubMed: 10483399

Read the original paper →

Related papers

← Back to the Research Library