Class II composites are inferior to amalgam due to:
**Core Concept**
The question tests the understanding of **dental restorative materials**, specifically comparing **Class II composites** and **amalgam**. This involves knowledge of their physical properties, durability, and clinical performance.
**Why the Correct Answer is Right**
Class II composites are indeed inferior to amalgam in certain aspects, primarily due to issues like **polymerization shrinkage**, **microleakage**, and lower **wear resistance**. These factors can lead to **secondary caries** and restoration failure, making amalgam a more durable option in some cases.
**Why Each Wrong Option is Incorrect**
**Option A:** Incorrect because while **polymerization shrinkage** is a concern, it's not the only reason composites are inferior to amalgam.
**Option B:** Incorrect as **aesthetics** favor composites, not a reason they are inferior.
**Option C:** Incorrect because **bonding techniques** have improved significantly.
**Clinical Pearl / High-Yield Fact**
A key point to remember is that **amalgam** still offers superior **durability** and **resistance to wear**, making it a preferable choice in certain clinical scenarios, despite its aesthetic drawbacks.
**Correct Answer:** D. Lower wear resistance and higher failure rate due to polymerization shrinkage and microleakage.