Root canal therapy is a special instrument used by doctors to completely remove the infected pulp, infected dentin and toxic decomposition products, and after root canal washing, disinfection and tightly packing the root canal, it can isolate bacteria from entering the root canal and prevent re-infection and prevent the occurrence of periapical disease or promote the healing of periapical disease. The following are the root canal treatment steps.
Tooth root canal treatment must remove the humus before opening the pulp, and then use another new bur to enter the medullary cavity. After penetrating the medullary cavity, change the high-speed ball drill to uncover the roof. The uncovering must be full so that the entire pulp chamber can be seen clearly. The bottom shall prevail, and then use a split drill or emery bur to trim the marrow wall.
This root canal treatment step actually includes the preparation of the crown section, the dredging of the root canal and the determination of the working length. We generally use three methods for preparing the medullary cavity: standard method, gradual retreat method, and coronal deep method. No matter which method is used, we recommend that the crown canal preparation should be the first step of root canal preparation.
The following three methods are used to determine the length of the root canal: x-slice method, root tester measurement, and hand feel method. It is recommended that the root tester prevail.
However, the root measuring instrument may be inaccurate in the following three situations, so it is recommended to take a first set film:
a. The apical hole is damaged or the tooth with a large apical hole.
b. A tooth with a larger apical shadow.
c. A tooth with residual pulp after an incomplete pulp extraction.
The method of root canal preparation is nothing more than one of the three methods mentioned above (standard method, gradual retreat method, coronal depth method) or a combined method. The commonly used equipment and recommended methods generally include the following types: k file (10 #～40#), c set (6#, 8#, 10#), G drill, M-Taper hand use two sets of different equipment with different preparation methods:
①Stainless steel frustration, this system routinely uses the step-by-step back method, and the preparation method uses the balance force method.
②The M-Taper instrument uses a step-by-step approach. The root canal system is very complicated. Any instrument and any method of preparation cannot reach the entire root canal system, so the combination of mechanical preparation and chemical preparation is very important.
Filling time, no symptoms, no obvious pain, no peculiar smell in the root canal, no exudation, no symptoms of acute periapical inflammation, filling can be done without waiting for all symptoms to disappear, repeated sealing of the medicine will easily cause great irritation to the apical circumference.
Filling method, quality control standard:
a. The distance between the filling and the root tip is less than or equal to 2mm.
b. The filling is dense, continuous, and the taper is appropriate.
c. After filling, the gutta-percha tip is 2～3mm below the root canal orifice, and the small stuffer is cold pressurized.
d. For under-filled patients, it is necessary to prepare for filling again. In principle, over-filling is not recommended to be repeated. Follow-up and apical surgery if necessary. Current research shows that under the same premise of other factors, the prognosis of overcharge is worse than undercharge.
The above is the root canal treatment steps.