1. The periapical not formed: more common in young permanent teeth. Teeth by trauma, causing the pulp exposed pulp necrosis. There are two methods of clinical formed at the end of treatment apical teeth: an indirect or direct pulp capping another apical angioplasty. Indirect or direct pulp capping is the use of a capping agent, such as calcium hydroxide or other calcium-containing paste, covering the surface of the cave or pulp, so that the formation of reparative dentin, and to achieve the purpose of the formation of apical. Apical angioplasty is the use of calcium-class preparation for root canal filling; promote dental hard tissue formation, particularly in promoting apical formation, to achieve the purpose of apical closure.
2. Radicular cyst: it is a chronic periapical lesion. Its features are: pulp necrosis, tooth discoloration, dull. The cyst can be very flexible, visual observation of the tooth can not determine its size. In some cases, can touch the gingival mucosa bulge, with ping-pong-like shells sexy. Deal with Radicular cyst, the first treatment of the root canal. Such a root canal is not easy to dry, in the use of antibiotics to dental instruments control infection, surgical removal of the cyst.
3. Root broken: odontoclasis site may occur in different parts of the tooth, broken tooth neck, the root the middle broken and periapical broken. Handling odontoclasis no special way to What steps do dental implants encounter odontoclasis cases are taken to solve tooth extraction. Now for the root middle and apical broken cases using internal fixation in the treatment of the root canal.
4. Calcified root canal orifice: more common in reparative dentin done endodontic treatment of teeth or carious teeth of the elderly is common. Ball drill clinical treatment, combined dental films, drilling and grinding direction, and then expands the root canal treatment.