Background
fracture, discoloration
INFILTRATING
The aesthetic CAD/CAM materials have undergone significant advancements, changing the treatment from a two-step, bi-layered, high-strength ceramic restoration to a single step, monolithic restoration that eliminates veneering chipping and fracture issues [With the advancements in adhesive dentistry and resin composites, a new unique material that has been referred to as “nano-ceramics” or “hybrid ceramics” in the commercial market was developed in the last ten years with high chance of success as aesthetic restoration [Hybrids are considered as infiltrating porous ceramic with polymers. There are two categories on the market based on microstructure; dispersed filler (DF) and polymer-infiltrated ceramic network (PICN). The ceramic and polymer phases of PICN, also known as resin interpenetrating network ceramic, form a continuous three-dimensional interconnected network [The first material in this classification to be introduced is Vita Enamic. The product’s attributes, according to the manufacturer, lessen the likelihood of crack propagation and fracture by combining the advantages of composites and ceramics to relay strength and elasticity and behave like dentin. Its flexural strength ranges from 150 to 160 MPa and its composition is 86% ceramic and 14% polymer. Due to the special ceramic composition, it is unique in that it can be etched with 5% hydrofluoric acid for 60 s on the intaglio surface [Cerasmart nanoceramic block was introduced to combine the advantageous qualities of ceramic and resin technology. The material is made up of 29% resin and 71% silica and barium glass nanoparticles. This material, which has a flexural strength of 238 MPa, is intended for anterior, posterior, and implant restorations that require the least amount of preparation [Aesthetic considerations in dental rehabilitation highlight the importance of the color stability of dental materials. Different foods and beverages can stain dental restorations when they come into contact. All these may cause the restorations to fail aesthetically. Composites have a far higher discoloration potential when compared to ceramics [The amount of discoloration is mostly determined by the composition of the material, type of environment, and contact period [In clinical situations with different dental materials, the evaluation of color distinctions is quite important. The color stability of resin matrix ceramics is critical, as clinically observable over time. Due to the high demand for cosmetic procedures, clinicians must be careful when selecting restorative materials, since this is one of the most important elements determining long-term treatment effectiveness [The durability of color in contemporary hybrid ceramics is mostly unknown. The current in-vivo study aimed to probe the color stability of two hybrid ceramics (Vita Enamic; EN) and (Cerasmart; CS) under the variety of clinical conditions. The null hypothesis of the present study was that there will be no statistically significant difference regarding color stability of the tested two resin matrix ceramics.