| What is the meaning of Bioactive coating? |
Coating is a covering that is applied to the surface of an object, usually referred to as the substrate. In many cases coatings are applied to improve surface properties of the substrate, such as appearance, adhesion, wetability, corrosion resistance, water resistance, and scratch resistance. The coating forms an essential part of the finished product. Bioactive coating alter the bioactivity of the surface. |
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| What are types of inorganic Bioactive coatings ? |
Inorganic bioactive coatings can be divided in three classes namely Ceramic (Calcium Phosphate based), Glassy (Bioactive glass) and Glass-ceramics coatings. |
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| What is the process of surface preparation of metallic prosthesis prior to coating ? |
The metallic prostheses to be coated are first cleaned from any adherent dirt and greasy substances by ultrasonic cleaning in soap or detergent water followed by acetone and then dried. The prostheses are masked using suitable tapes or masks in order to protect the area not required to be coated, and then shot blasted with suitable blasting medium like alumina, hydroxyapatite, metallic shots or simply sand blasted to generate a clean and rough surface The masks are then removed and the prostheses are again cleaned ultrasonically as before and dried in an air oven and stored in air tight bags prior to coating application. |
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| What is the procedure of microplasma spraying of Synthetic Hydroxyapatite on metallic prostheses ? |
| The metallic prostheses after surface preparation is again masked or screened to enable selective coating on the total surface. The desired surface is coated with suitable free flowing plasma sprayable hydroxyapatite powder (preferably spray dried), having requisite particle size range using plasma torch. After that the coated prosthesis is subjected to a suitable heat treatment schedule to remove strain. Heat-treatment improve the crystallinity of the coating remarkably The heat-treatment enable the coating to react with moisture in air and to incorporate hydroxyl ions into the amorphous/HAp structure. Finally the coating is characterized, sterilized and stored after suitable packaging |
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