Calcium sulfate (CS) (CaSO4) occupies a unique position among bone regenerative materials. It is used in clinical practice for long time than most currently available biomaterials and is widely recognized as a biocompatible material with applications in bone regeneration. It has the advantage that it is available and inexpensive (Thomas & Puleo, 2009). The ‘‘gypsum’’ or CS is a mineral consisting of calcium sulfate dehydrate (CaSO4.2H2O). It must be screened before use in medical practice for impurities such as silicates, lead, strontium, and other naturally occurring materials (Ricci, Alexander, Nadkarni, Hawkins, Turner, Rosenblum, Brezenoff, De Leonardis & Pecora, 2000).
The properties of the rehydrated gypsum plaster depend on several factors, such as the fineness, the purity and the energy of mixing the powder with water. These factors affect specially the setting times (Karni and Karni, 1995). The final strength depends on the size and the shape of the formed crystals and the bonding force between them, as well as on the porosity, which depends on the water/gypsum plaster (W/GP) ratio employed in the mixture (Lewry and Williamson, 1994b; Yu and Brouwers, 2011). A high quantity of gypsum plaster wastes (GPW) is generated in civil construction activities, which is due to its fast and variable setting time. These wastes are produced during the paste mixing and application of gypsum plaster in construction and in the demolition of buildings (Nita et al., 2004).
An excellent example is an Egyptian blue sample from the tomb of Imhotep at the site of Sheikh Said (the 6th Dynasty). The glass phase is selectively decomposed and replaced by basic copper chloride, this phenomenon called ״Copper Chloride Cancer״. Egyptian monuments are known to contain considerable amounts of sodium chloride, when dissolved, it will also react with Cu (I) chloride in solution or copper oxide in the pigment to form paratacamite. Evaporation of water at the outer surface of the walls will lead to high concentration of sodium chloride (NaC1) in the residual liquid thus causing the precipitation of paratacamite on the outer surface of the pigment. This disease develops in stages; it starts with the diversification of the glass phase, followed by decomposition of the residual material.
In an article published by Prosthetic Design, we learn that there are four main types of prosthetics. The types are joint prosthetics, arm prosthetics, leg prosthetics, and cosmetic prosthetics. The different types help a wider range of people be able to use prosthetics, and have an easier and more normal life experience. If prosthetics had not been invented, a huge amount of people would not be able to do many things such as walking or sports. Think about the Paralympics!
The Body Types, there are 3 unique body types namely ectomorph, endomorph and mesomorph. Each type can compete in body building shows. The training, diet and rest regimen of each type vary since bodies develop uniquely from each other. There are variations or combinations of the types as well, such as mesomorphs with either endomorphic or ectomorphic tendencies. Physiques will vary in appearance depending on the body type.
These reactions occur at varies rate and varies time. Altogether, these chemical reactions determine how cement harden and gain strength. The main product of hydration of silicate mineral is a calcium silicate hydrate (C-S-H) of colloidal dimension that, at early ages, under 11 | Page scanning electron microscope, usually shows up like an aggregation of very fine grains partly inter-grown together ( Reinhardt, 1995). Beside calcium silicate hydrate (C-S-H), other product of hydration are such as calcium hydroxide, ettringite and monosulfate. Calcium hydroxide is also more soluble and alkaline than the other hydration products.
All these parts are continuously evolving in regard to their shape and the composition materials. Figure 2 : Anatomy of the dental implant  2.2 Types of dental implants Dental implants based on their specific region of implantation have different designs and frequently used in dental implantology are (Figure 3: Different types if dental implants  : Endosteal (placed inside the bone), Subperiosteal (placed over the bone), Transosteal (placed through the bone), Intramucosal (placed inside the soft tissue). Dental implants on the basis of their particular application have different designs which may include: Root form (3 to 5 mm diameter, 7 to 20 mm height) Blade form (2.5 mm in width, 8- to 5 mm in depth, 15 to 30 mm in length) Ramus form: only a part of the metal is implanted in the bone (Figure 4 Root form implant and Figure 5 Ramus Frame)  2.3 Bone Quality and Density The term bone quality is often used in implant treatment and in reports on
Types of wall paints Paint consists of pigments and oil or water-based binder (the binder being the majority in volume). For paints to adhere to a surface, the first coat (normally the ‘Primer’) must provide a ‘key’ into the base material (so that paint does not just fall away) and to provide a surface for the other coats. Water based paints: Water based paints are called so because they are mixed with water and then applied. Advantages: They are one of the most popular paints in themarket