补牙的材料及护理（Materials and dental care）.doc

补牙的材料及护理（Materials and dental care） Method for repairing tooth defect by artificial substance. The material used to repair is called filling material. From dental caries, wedge shaped defect, trauma caused by tooth tissue defect are in need of repair, in order to restore the shape and function. When the disease has spread to the pulp, and even cause periapical disease, should be the first treatment of dental pulp, and fillings. There are two main steps to dental cavity preparation and filling. Cavity preparation is composed of cavity wall, hole edge, hole angle. Preparation of cavity principle is: the net addition to the lesion, otherwise it will cause secondary caries; the protection of dental pulp and healthy teeth; establish good retention form (that can maintain the filling body can not fall off and loose in the cavity shape) and resistance form (i.e. can bear masticatory force not to make the filling body or broken tooth shape), so as to avoid filling broken off and not closed due to secondary caries. Fill in the isolated saliva, disinfect the cavity, mix the filling material into the cavity, and engrave the shape immediately. We should pay attention to removing the part beyond the bite surface so as to avoid the iatrogenic occlusal trauma. The adjacent side can not leave the filling of the suspension process, in order to stimulate the gums, causing inflammation. The filling material should be non-toxic, wear-resisting, compressive strength, filling volume, change, and pit cavity close, not corrosion or dissolution of saliva, easy to operate and beautiful color and other properties. However, there are no materials that fully meet the above requirements. Only appropriate filling materials can be selected according to the location of the defect, the size of the force and the aesthetic requirements. More commonly used in the posterior teeth of silver amalgam, in the front teeth, especially affecting the beauty of the site, more choice of resin. Silver amalgam. All