NEET MDS Shorts
98948
EndodonticsIf the main canal is well obturated and the tooth becomes asymptomatic, unfilled accessory canals often heal spontaneously. Immediate surgical intervention is not indicated unless symptoms persist or develop.
83330
EndodonticsHydrogen peroxide is the solution used to bleach non-vital endodontically treated teeth. Typically used as: 1) 30% hydrogen peroxide (Superoxol) for in-office bleaching, 2) Can be activated with heat for enhanced effectiveness, 3) May be mixed with sodium perborate for walking bleach technique, 4) Penetrates dentin tubules to break down chromophores causing discoloration. Chloroform and ether are solvents used for gutta-percha removal, while sodium hypochlorite is an irrigant for canal disinfection, not bleaching.
76052
EndodonticsInternal resorption in a vital symptomatic tooth requires complete pulpectomy to remove all pulp tissue causing the resorption. Pulpotomy would leave infected pulp tissue that continues the resorptive process.
83424
EndodonticsLentulo spirals are used for application of root canal sealer. These instruments: 1) Have a spiral design that rotates counterclockwise at low speed, 2) Carry sealer into the canal and coat the walls evenly, 3) Ensure proper sealer distribution before gutta-percha placement, 4) Help achieve intimate contact between sealer and canal walls, 5) Are sized to match canal preparation dimensions. They are NOT used for locating orifices, pulp extirpation, or canal enlargement. Proper sealer application is crucial for achieving optimal obturation quality.
20402
EndodonticsExplanation: Class IV in the Ellis classification indicates a fracture that has resulted in pulp exposure, often leading to a non-vital tooth. Class IV: Crown Fracture with Pulp Involvement Description: Extensive fracture involving enamel, dentin, and pulp, often with significant loss of tooth structure.Endodontic Consideration: Endodontic treatment is necessary due to pulp exposure. The tooth may require additional restorative procedures after root canal therapy to restore function and aesthetics.
65285
EndodonticsThe main objective of obturation is to fill the canal and prevent apical percolation of fluids. This primary goal involves: 1) Creating a fluid-tight seal at the apical foramen, 2) Preventing bacterial penetration from oral cavity, 3) Eliminating pathways for tissue fluid seepage, 4) Preventing recontamination of treated root canal system. While preventing discoloration and providing support for restoration are secondary benefits, the fundamental purpose is to achieve biological seal that prevents apical periodontitis by eliminating bacterial access to periapical tissues.
59501
EndodonticsEmergency treatment requires immediate access to remove necrotic pulp tissue and establish drainage through the root canal. This provides the most effective drainage and removes the source of infection.
94014
EndodonticsThis statement is untrue because calcium ions in the calcific bridge come from the bloodstream via pulp tissue, not directly from the calcium hydroxide paste. The hydroxyl ions create the alkaline environment that promotes hard tissue formation.
27666
EndodonticsGutta-percha cones are generally not recommended for root canal filling in primary teeth because the root canals of primary teeth are more likely to contain vital tissue, and the material can potentially cause harm to these tissues. However, they are suitable for permanent teeth with wide root canals and even those with curved roots, provided that the root canals are properly cleaned and shaped to allow for optimal filling.
69512
EndodonticsRadiographically, it is virtually impossible to definitively distinguish a granuloma from a cyst. A granuloma consists of inflamed granulation tissue without an epithelial lining, whereas a cyst must have an epithelial-lined lumen. Histology remains the "gold standard" for diagnosis.