The effect of a layer of resin luting agent on the biaxial flexure strength of two all-ceramic systems.

Statement Of Problem: The influence of a layer of resin luting agent on the longevity of glass-ceramic crowns has been demonstrated in some laboratory and clinical studies. The mechanisms of glass-ceramic crown failure and the influence of the resin luting agent layer are still not clearly understood.

Purpose: The objectives of this study were to examine the difference in biaxial flexure strength between 2 glass-ceramic dental materials and to examine the influence of a layer of resin luting agent on the characteristic strength of these materials.

Biomechanical response of the cornea to phototherapeutic keratectomy when treated as a fluid-filled porous material.

Purpose: Surgical effect on corneal deformation has been traditionally analyzed based on the solid material assumption. We examine the validity of this assumption by treating the cornea as a fluid-filled porous material and separately modeling the solid and fluid constituents inside the cornea. In particular, the internal sub-atmospheric fluid pressure is treated as an important part of the mechanical loading in addition to the intraocular pressure.