Fracture Resistance And Retention Of Three Monolithic Zirconia Inlay Retained Fixed Partial Denture Designs Using Two Different Surface Treatments

Abstract

The current study presents the option for manufacturing monolithic translucent zirconium dioxide (ZrO2) inlay-retained FPDs as a conservative solution. Zirconia is characterized by the high mechanical properties and the monolithic translucent part allows for a more esthetic appealing restoration. With the help of the resin cement breakthrough of MDP addition to help cementing the zirconia framework to the tooth structure, better retention should be achieved. This study aims to evaluate the effect of three different designs proximal box design, occlusal & proximal box design, and butterfly wing design [modified inlay] with two different surface treatment protocols [sandblasting and tribochemical Silica coating] on the fracture resistance and retention of translucent zirconia inlay-retained fixed partial denture (IRFPD). 60 translucent zirconia IRFPDs were constructed using CAD/CAM technology. They were divided into two equal groups according to the testing methodology Group I: Fracture resistance test [n=30] and Group II: Dislodgment resistance test [n=30]. Each group was further divided into three equal subgroups according to the IRFPD design: Subgroup A [Proximal box design (n=10)], Subgroup B [occlusal & Proximal box design (n=10)] and Subgroup C [Butterfly wing [Modified inlay] design (n=10)].Each subgroup was further divided into two equal subdivisions according to the surface treatment protocols Subdivision i: Sandblasting [n=5] and Subdivision ii: Tribochemical salinization [n=5]