Objective: This retrospective study evaluated the clinical success
and survival of monolithic lithium disilicate single crowns
in the posterior region fabricated with feather-edge margins
and cemented with resin-based self-etching cement. Method
and Materials: In total, 627 pressed monolithic lithium disilicate
restorations on posterior teeth (110 first premolars, 151
second premolars, 240 first molars, 121 second molars, 5 third
molars) were placed in 335 patients. All teeth were prepared
with feather-edge margins and restored with single crowns.
The modified California Dental Association criteria were used to
clinically evaluate subjects during regular maintenance recalls.
Results: The mean follow-up time was 48.17 months (SD, 27.7;
range, 6 to 144). Nine crowns were replaced during the follow-up period due to bulk fracture of the material (overall
97.93% survival rate), and four teeth were extracted. No other
technical or biologic failure was observed. Conclusion: In this
retrospective evaluation, monolithic lithium disilicate crowns
with feather-edge margins yielded clinical outcomes similar to
those reported with other margin designs and materials.
Following the same clinical protocol, crowns on second molars
showed lower survival rates when compared to restorations on
other teeth in the posterior region. Careful evaluation is mandatory
in high-risk patients and terminal teeth. Alternative restorative
materials, such as full-contour zirconia crowns, should be
considered for the restoration of second molars.