Which type of cement is regarded as the worst for deep restorations?

Which type of cement is regarded as the worst for deep restorations?

• A. Glass ionomer cement
• B. Zinc phosphate cement
• C. Resin-based cement
• D. Composite resin cement

Answer: (B)

Zinc phosphate cement is regarded as the least suitable choice for deep restorations due to its physical and chemical properties. This type of cement is known for its high strength and durability; however, it has notable limitations when applied in deeper cavities. One primary concern is its potential for postoperative sensitivity, as it stimulates the pulp tissue more than other cements, which can lead to discomfort for the patient. Furthermore, zinc phosphate cement has a relatively low pH upon mixing, which can be unfavorable for the pulp's health in deep restorations. This low pH can cause irritation to the pulp, particularly if the restoration is close to it, leading to compromised pulp vitality. In addition, its film thickness may not provide optimal adaptation to tooth structure, potentially resulting in reduced retention and sealing ability in deeper restorations. In contrast, other cements like glass ionomer, resin-based, and composite resin cements provide better thermal insulation and are more biocompatible, making them suitable for deep restorations. They also exhibit improved bonding to tooth structure, which is crucial for the longevity of restorations placed in deeper cavities.

Zinc phosphate cement is regarded as the least suitable choice for deep restorations due to its physical and chemical properties. This type of cement is known for its high strength and durability; however, it has notable limitations when applied in deeper cavities. One primary concern is its potential for postoperative sensitivity, as it stimulates the pulp tissue more than other cements, which can lead to discomfort for the patient.

Furthermore, zinc phosphate cement has a relatively low pH upon mixing, which can be unfavorable for the pulp's health in deep restorations. This low pH can cause irritation to the pulp, particularly if the restoration is close to it, leading to compromised pulp vitality. In addition, its film thickness may not provide optimal adaptation to tooth structure, potentially resulting in reduced retention and sealing ability in deeper restorations.

In contrast, other cements like glass ionomer, resin-based, and composite resin cements provide better thermal insulation and are more biocompatible, making them suitable for deep restorations. They also exhibit improved bonding to tooth structure, which is crucial for the longevity of restorations placed in deeper cavities.