What is the influence of the operator on the long-term survival of posterior partial lithium disilicate restorations in an undergraduate setting?

Objective: To evaluate the influence of the (undergraduate) operator on the survival and success rate of posterior partial lithium disilicate restorations.

Materials And Methods: Patients who received at least one posterior partial lithium disilicate restoration between 2009 and 2019 by undergraduates at the Center for Dentistry and Oral Hygiene in Groningen were included. Operator- (academic year (4th, 5th, 6th year)), patient- (presence of a nightguard, caries risk, age), tooth- (endodontic status, inlay/onlay, position of the restoration outline) and material-related factors (cement type, rubber dam use, Immediate Dentin Sealing) on the survival and success rate were analyzed using multilevel Cox regression (p < 0.