DENTAL IMPRESSIONS WHY DENTAL IMPRESSION ? Dental impression is a replica of patient mouth.There are many procedures in dentistry to make a treatment complete.In this busy world we can not call the patient every time for our procedure,so we will take a impression of patient mouth and use it whenever we needed.It is used for variety of purposes in dental field. MATERIALS USED FOR DENTAL IMPRESSION 1.ALGINATE Alginate is a type of impression material.It is powder in nature,when mixes with water it turns into a cake batter consistency,and it will turn hard within 3 mins,because its setting time is 3 mins.Alginate contains alginic acid in it,it is a kind of polymer derived from sea weed.It also contains hydrous calcium sulfate .These two only major ingredient in alginate.There are various flavours in alginate powder,for example mango,strawberry,mint,vannila,lavender,etc.There is also color changing type