Cement spacing for the one-step post-core and crown. A new laboratory technique

Area of Science:

• Dental Materials Science
• Prosthodontics
• Biomaterials Engineering

Background:

• Post-core restorations are crucial for retaining crowns on endodontically treated teeth.
• Cementation of post-cores can be challenging due to potential 'wedging' and inadequate cement space.
• Ensuring proper cement space is vital for predictable luting and long-term restoration success.

Purpose of the Study:

• To describe a novel technique for creating cement spacing on cast post-cores before crown fabrication.
• To evaluate the effect of cement spacing on the axial lift of cemented crowns.
• To assess the efficacy of three different materials in providing cement spacing for post-cores.

Main Methods:

• A technique for creating cement spacing on cast post-cores was developed and applied.
• Crowns were cemented using zinc phosphate cement on both spaced and non-spaced post-cores.
• Axial lift measurements were recorded for crowns on both types of post-cores.
• Three materials were tested for their ability to create adequate cement spacing.

Main Results:

• A technique for providing cement spacing for cast post-cores was successfully described.
• Crowns cemented on non-spaced post-cores exhibited greater axial lift than those on spaced post-cores, though the difference was not statistically significant.
• The phenomenon of post-core 'wedging' during the luting process was identified.
• The effectiveness of three materials in creating cement spacing was evaluated.

Conclusions:

• The described cement spacing technique is a viable approach for cast post-cores.
• While not statistically significant, minimizing cement space may reduce axial lift during cementation.
• Understanding and mitigating post-core wedging is important for successful cementation.
• Further research is needed to optimize materials and techniques for post-core cement spacing.