The Effect of Two Margin Designs on Fracture Resistance of Different Ceramic Crown Materials

Abstract

The continuous search for better qualities and properties will never stop. As the advancements in dentistry continue, new materials and techniques are being introduced to the market to meet the increasing demand for superior esthetics, best physical and mechanical properties. Bio-compatability and efficiently functional restoration are goals that clinicians and technicians aspire to achieve in daily dental practice. This study was designed to compare and evaluate the effect of different margin design on the fracture strength of three different ceramic materials which are: High Translucent Zirconia, Zirconia re-enforced Lithium Silicate and Polymer infiltrated Ceramic Network. Two natural maxillary premolars were prepared using CNC machine to achieve a desired standardized reduction. The two reduction designs were feather edge finish line design and deep chamfer finish line design. An impression was made for the natural teeth using additional silicon materials. The impression was used as a mold to create 42 epoxy resin dies. Those 42 epoxy samples will be divided according to the ceramic material into two main groups. Each group will be divided into 2 subgroups according to the preparation design.