Translucency and flexural strength of monolithic translucent zirconia and porcelain-layered zirconia

Abstract

This study aims to investigate the effectiveness of monolithic translucent TZP with different colors and porcelain-layered TZP by evaluating their colors and strengths. Different mixing ratios of Zpex to Zpex-Yellow as translucent TZP, conventional opaque TZP (TZ-3YB-E) (Tosoh, Tokyo) as a control, and veneering porcelain (CERABIEN ZR, body porcelain, Noritake, Tokyo) with shade A3 as a typical shade. Disk-shaped specimens of 13 mm diameter and 1.5 mm thickness were prepared. These specimens were observed under reflected and transmitted light, and the translucency parameter (TP) values were measured. Strength was also evaluated with flexural strength in a biaxial bending test. The TP values of the monolithic TZP, Zpex100>Zpex70>Zpex50>TZ3YB, were larger in this order. The flexural strength of all the monolithic TZP showed approximately 1,000 MPa. It is suggested that colored translucent TZP is clinically useful when used as monolithic restorations.

Comparative fracture behavior of monolithic and veneered zirconia posterior fixed dental prostheses

“…The conditions of thermal cycles meet the requirements of the ISO TR 11450, however and although there is a lack of standardization, several studies recommend that more cycles are needed 16,17,20,29,40) . The results of the study indicate that monolithic zirconia restorations are an indication for clinical application and will solve the chipping problem 41) . However, futures in vitro research concerning the behavior of monolithic zirconia and clinical studies should be performed to evaluate the clinical performance of monolithic zirconia restorations before being considered generally applicable.…”

Fabrication and characterization of ZrO2/Ni composites

“…This indicates that the samples are characterized by some porosity. According to literature data, the optimal sintering temperature (relative density of samples close to theoretical) for the zirconia powder used for research is 1450 [23]. The used temperature was slightly lower which could cause a decrease in density.…”

Shear bond strength of indirect composite material to monolithic zirconia

“…It requires less preparation9 because the needed material thickness for restoration is less than other all-ceramic materials that allow full anatomical restoration 11. However, this material is opaque12 therefore indicated only in less-visible dental areas 1314…”