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Composite Resins — Types & Properties

Conservative Dentistry & Endodontics • NEET MDS Study Guide • AI-Generated Notes

⭐ High-Yield Facts for Exam

  • Bis-GMA = main resin matrix.
  • Hybrid = best overall; microfill = best polish.
  • Cure in ≤2 mm increments.
  • C-factor = bonded/unbonded surfaces.
  • Incremental placement reduces shrinkage stress.

Composite Resins

Composition

Resin matrix (Bis-GMA, UDMA, TEGDMA), filler particles (silica/glass), and a silane coupling agent linking them.

Filler-based Classification

  • Microfilled — best polish/esthetics, lower strength.
  • Hybrid / microhybrid — best overall balance of strength and polish.
  • Nanofill / nanohybrid — latest; good esthetics and strength.

Key Concepts

  • Depth of cure — place in increments of ≤ 2 mm to ensure complete polymerization.
  • Polymerization shrinkage — causes stress at margins; minimised by incremental placement.
  • C-factor — ratio of bonded to unbonded surfaces; a higher C-factor means more shrinkage stress.

Exam Tips ⭐

Hybrid = best overall; microfill = best polish; cure in ≤2 mm increments; high C-factor = more stress.

📝 Practice MCQs — Composite Resins — Types & Properties

Q1. The most common resin matrix in composites is:
A. PMMA
B. Bis-GMA
C. TEGDMA only
D. Polyacid
Show Answer
✅ Answer: B
Bis-GMA is the principal resin matrix monomer.
Q2. Composite should be placed in increments of about:
A. 2 mm
B. 5 mm
C. 8 mm
D. Bulk only
Show Answer
✅ Answer: A
≤2 mm increments ensure adequate depth of cure (except bulk-fill systems).
Q3. A high C-factor results in:
A. Less shrinkage stress
B. More polymerization shrinkage stress
C. Faster cure
D. Better polish
Show Answer
✅ Answer: B
More bonded surfaces (high C-factor) increase shrinkage stress.
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Related Topics

Dental Bonding Agents — GenerationsGlass Ionomer CementDental Ceramics — Types & Systems