NCT02758457.

Trial name or title	'Zirconia and metal‐based single crown posterior restorations'
Methods	Randomised, parallel‐group study
Participants	72 adult patients in need of a single posterior ceramic crown
Interventions	Group 1: a metal‐based restorations (single crown with a metal framework and pressed ceramic) Group 2: a zirconia‐based restorations (single crown with a zirconia framework and pressed ceramic)
Outcomes	Survival Technical complication rate (time frame: 5 years) assessed by USPHS criteria Bleeding on probing, pocket probing depth
Starting date	January 2008
Contact information	carlo.monaco2@unibo.it
Notes