- The primary limitation of silicate cements in restorative dentistry is their high solubility in oral fluids.
- This characteristic leads to the gradual dissolution of the cement when exposed to the moist environment of the oral cavity, resulting in loss of material integrity and potential failure of the restoration over time.

- Although silicate cements were popular due to their esthetic qualities and ability to release fluoride, their durability is compromised because they dissolve relatively quickly compared to other restorative materials like glass ionomer cements or resin-based composites.

- Other options, such as tooth discoloration, poor mechanical strength, and difficulty in handling, are less prominent or not the main concerns in the use of silicate cements. The high solubility remains the critical drawback limiting their long-term effectiveness.

Important points:
- High solubility leads to material breakdown in oral fluids.
- This results in decreased restoration longevity.
- Despite fluoride release, durability issues limit their use.

Reference: Anusavice, Phillips' Science of Dental Materials, 12th Edition, Chapter 14 / Page 365