Restorative & Materials · single question
What type of composite resin is MOST resistant to wear?
Show answer and explanation
Correct answer: C. Hybrid composite with smooth surface / large filler fraction
C) Hybrid/larger filler composite (smooth surfaces) — CORRECT.
Wear resistance in composite resin is related to filler content and filler size. Composites with LARGER filler particles in HIGH concentration (macrofills and hybrids) demonstrate greater wear resistance than microfills. However, the exam is testing the concept that larger fiber/filler content = more wear resistance. The "smooth surfaces" option may relate to surface treatment — polished composites with large filler content resist wear best clinically.
A) Macrofill/larger particles: Correct concept — high wear resistance but poor esthetics due to rough surface.
B) Microfill: Excellent polishability and esthetics but POOR wear resistance — low filler content by weight.
D) Flowable: Lower filler content = lower wear resistance; used in liner/base applications.
Wear resistance in composite resin is related to filler content and filler size. Composites with LARGER filler particles in HIGH concentration (macrofills and hybrids) demonstrate greater wear resistance than microfills. However, the exam is testing the concept that larger fiber/filler content = more wear resistance. The "smooth surfaces" option may relate to surface treatment — polished composites with large filler content resist wear best clinically.
A) Macrofill/larger particles: Correct concept — high wear resistance but poor esthetics due to rough surface.
B) Microfill: Excellent polishability and esthetics but POOR wear resistance — low filler content by weight.
D) Flowable: Lower filler content = lower wear resistance; used in liner/base applications.
Practice Restorative & Materials questions Restorative & Materials study notes