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

OBJECTIVES

To use profilometry to assess the margin surface profile of all-ceramic crowns (ACC's) at try-in and 1-week after cementation with dual-cured resin (DC, RelyX ARC, 3M ESPE, St. Paul, MN, USA), self-adhesive dual-cured resin (SADC, RelyX Unicem, 3M ESPE), light-cured resin (LC, RelyX Veneer, 3M ESPE) or chemically cured resin-modified glass ionomer (RMGI, RelyX Luting Plus, 3M ESPE) luting cement.

METHODS

Forty, sound, extracted, human, premolar teeth underwent a standardised preparation for ACC's. IPS Empress (Ivoclar-Vivadent, Liechtenstein) crowns of standard dimensions were fabricated and 10 luted with each cement and stored in water for 7 days. Three groups of serial profiles were taken, the first of the tooth preparation, the second of the crown margins at try-in and lastly of the crown margins after cementation and 7 days water storage.

RESULTS

There were no significant differences in the crown margin surface profile between the four cement groups at try-in. The change in crown margin position between try-in and post-cementation was significantly greater for DC than for LC and RMGI. SADC was not significantly different to the other cements. There were no significant differences in the crown margin extensions between the four cement groups, however most of the IPS Empress ACC's in this study were underextended but this was not statistically significant.

CONCLUSIONS

IPS Empress ACC's seated more fully with LC and RMGI than with DC cement.