Abstract
The aim of this research is to review the literature for the influence of the thickness
and shape of cervicalmargins on the strength of posterior monolithic zirconia crowns.
Studies to assess the fracture resistance of monolithic zirconia crowns with different
types of cervical margins, published from 2014 to 2020, were searched using the electronic
database PubMed and Google Scholar using the following keywords: “monolithic zirconia,”
“translucent,” “shoulderless,” and “margin preparation design.” Analysis of studies
has shown that overall the design of the margin would have a significant effect on
the strength of these crowns. Monolithic zirconia crowns with a knife-edge margin
have shown a breaking load higher than the maximum chewing force of humans. It would
be safe to suggest the utilization of posteriormonolithic zirconia crowns with vertical
preparation. As the new translucent monolithic zirconia crowns are recent, further
studies would be needed to guide the selection of the appropriate minimum thickness
of the knife-edge margin to meet the clinical guidelines for their use.
Keywords
margin preparation design - monolithic zirconia - shoulderless - translucent
