Effect of previsualization technique using visual eye modeling liquid on different types of veneering porcelain

Abstract

This study was designed to evaluate the effect of the previsualization technique using visual eyes modeling liquid on the color, translucency and biaxial flexure strength of three different types of veneering porcelain which are: porcelain fused to metal, porcelain fused to lithium disilicate and feldspathic porcelain. Matching a porcelain restoration is a difficult task for both the dentist and the dental technician. Shade communication and shade reproduction for a single anterior restoration is critical; because it is usually a mix of several shades and different degrees of translucencies. Since there is a difference between the index of refraction of the porcelain powder and water, judging the final porcelain color is impossible. A recent invention (visual eyes) introduced a new liquid binder that match the refractive index of porcelain allowing the previsualization of the presintered porcelain shade. The specimens were prepared into discs of 15mm diameter and 1.5 mm thickness. Forty two samples were tested for the IPS e.max veneered discs, feldspathic discs and the porcelain fused to metal discs. Twenty one were prepared with the manufacture liquid, while the other twenty one were prepared with visual eyes modeling liquid. The porcelain powder was prepared for the visual eyes liquid by removing the food dyes with a firing cycle recommended by the manufacture. The porcelain mixes were added using standardized Teflon molds of different thickness. The color and translucency were tested using an in lab spectrophotometer and the biaxial flexure strength were measured with a universal testing machine.