Quantification of all-ceramic crown margin surface profile from try-in to 1-week post-cementation

Area of Science:

• Dental Materials Science
• Prosthodontics
• Biomaterials Engineering

Background:

• Accurate seating of all-ceramic crowns (ACC) is crucial for long-term restoration success.
• Luting cement selection can influence the marginal fit and stability of dental restorations.
• Understanding cement behavior at the crown margin is essential for predictable clinical outcomes.

Purpose of the Study:

• To evaluate the margin surface profile of all-ceramic crowns (ACC) using profilometry.
• To compare the seating behavior of ACCs luted with four different cement types.
• To assess marginal fit at try-in and after cementation with various luting agents.

Main Methods:

• Forty human premolar teeth were prepared for ACC fabrication.
• IPS Empress crowns were luted with four cements: dual-cured resin (DC), self-adhesive dual-cured resin (SADC), light-cured resin (LC), and resin-modified glass ionomer (RMGI).
• Profilometry measured crown margin surface profiles at try-in and one week post-cementation.

Main Results:

• No significant differences in initial crown margin profiles were observed among the four cement groups at try-in.
• A significantly greater change in crown margin position occurred with DC cement compared to LC and RMGI cements.
• Most IPS Empress ACCs exhibited underextended margins, though this was not statistically significant across groups.

Conclusions:

• IPS Empress ACCs demonstrated improved seating with light-cured (LC) and resin-modified glass ionomer (RMGI) cements.
• Dual-cured (DC) resin cement resulted in a less complete seating of the all-ceramic crowns.
• Cement type significantly influences the marginal adaptation of all-ceramic restorations.