A compressive strength study of an all-ceramic crown

Area of Science:

• Dental Materials Science
• Biomaterials Engineering
• Restorative Dentistry

Background:

• Dental restorations require materials with high mechanical strength, particularly for posterior teeth subjected to significant occlusal forces.
• Traditional materials like porcelain and newer options such as Cerestore have varying degrees of fracture resistance.
• Porcelain-fused-to-metal (PFM) restorations have long been used, but their comparative strength against newer materials under load needs clear quantification.

Purpose of the Study:

• To compare the fracture resistance of porcelain-fused-to-metal crowns against Cerestore and all-porcelain crowns.
• To evaluate the mechanical performance of different crown materials under standardized occlusal loading.
• To determine the suitability of porcelain-fused-to-metal as a robust material for posterior dental restorations.

Main Methods:

• Eighteen dental crowns were fabricated using three different material types: porcelain-fused-to-metal, Cerestore, and all-porcelain.
• All crowns were subjected to identical occlusal loading conditions in a controlled laboratory setting.
• Fracture resistance was measured by the applied load until failure for each crown specimen.

Main Results:

• The porcelain-fused-to-metal crown exhibited more than double the load resistance of the Cerestore crown.
• Porcelain-fused-to-metal crowns were nearly four times stronger than the all-porcelain crowns.
• While Cerestore crowns were stronger than all-porcelain crowns, they were significantly less resistant to fracture than PFM restorations.

Conclusions:

• Porcelain-fused-to-metal restorations demonstrate significant strength and fracture resistance, making them a highly capable option for posterior dental applications.
• The mechanical performance of Cerestore crowns, though better than porcelain, does not match the robustness of porcelain-fused-to-metal.
• These findings support the continued use and consideration of porcelain-fused-to-metal crowns in clinical practice for demanding posterior restorations.