Boris D Jakubowicz-Kohen

• Université Paris Cité

Depuis une dizaine d’années, la zircone, sous sa forme métastable Y-TZP est utilisée comme alternative au métal afin de réaliser des armatures de prothèse dentaire. Ce matériau a été retenu pour ses propriétés optiques, mécaniques et biologiques. Cependant, une fragilité anormale s’est manifestée sous la forme de fractures cohésive de la céramique....

Mismatch in thermal expansion coefficient between core and veneering ceramic (Δα=αcore-αveneer, ppm/°C) is reported as a crucial parameter influencing veneer fractures with Yttria-tetragonal-zirconia-polycrystal (Y-TZP) prostheses, which still constitutes a misunderstood problem. However, the common positive Δα concept remains empirical. The object...

The objective of the present work was to study the curvature of very thinly, veneered Y-TZP discs of different framework thicknesses submitted to different firing times. Fifteen 20-mm-wide Y-TZP discs were produced in three different thicknesses: 0.75, 1, 1.5mm. One disc from each group was left unveneered while the others were layered with a 0.1mm...

The application of immediate loading of implants in the edentulous maxilla in multiple-risk patients is presented. Five partially edentulous patients attended with failing prostheses supported by hopeless teeth. An immediate-loading protocol was proposed because the patients rejected provisionalization with a removable prosthesis. Multiple teeth we...

This article provides preliminary clinical results on the Osseotite NT implant, which was developed to simplify surgical procedure and cover an extended range of indications. Placement characteristics of NT and standard Osseotite implants were also compared in an in vitro study. The in vitro placement characteristics of NT and standard Osseotite im...