NEET MDS Shorts
71229
EndodonticsThe length of time the tooth was out of the mouth directly affects the prognosis of an avulsed tooth most significantly. Critical time factors: 1) <30 minutes - excellent prognosis if properly managed, 2) 30-60 minutes - fair prognosis with increased risk of complications, 3) >60 minutes - poor prognosis with high likelihood of replacement resorption, 4) >2 hours - very poor prognosis. Extraoral time determines periodontal ligament cell viability, which is crucial for successful reattachment. While other factors matter, extraoral time is the most critical prognostic factor for avulsed teeth.
68376
EndodonticsAccording to Vertucci classification, Type III canals have two separate canals that join and exit as one foramen. However, the question describes two separate foramina, which would be Type IV. The answer key shows Type III, but this may need verification.
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.
76092
EndodonticsFor avulsed tooth reimplantation, only gentle saline irrigation of both socket and root surface is recommended. Aggressive curettage damages remaining periodontal ligament cells essential for successful reimplantation.
14058
EndodonticsThe first line of treatment for an acute apical abscess with swelling is to establish drainage. This relieves pressure, reduces pain, and removes the source of infection.
99254
Endodontics
Thermal testing is the most common diagnostic test used to determine the status of pulp vitality in dentistry. It assesses the nerve response of the pulp to hot or cold stimuli.
28080
EndodonticsThe protrusion of anterior teeth can increase the risk of fractures due to their position and exposure to occlusal forces. Protruded teeth are more susceptible to trauma and stress during biting and chewing, which can lead to fractures. Additionally, protruded teeth may not have adequate support from adjacent teeth, further increasing their vulnerability to fracture.
76050
EndodonticsThe purpose of root canal sealer is to fill the space between solid core material and the pulp canal walls. Root canal sealers serve to: 1) Fill irregularities and accessory canals not occupied by gutta-percha, 2) Create intimate adaptation between core material and canal walls, 3) Provide antimicrobial action in residual bacteria, 4) Seal dentinal tubules to prevent bacterial penetration, 5) Act as lubricant during gutta-percha placement. While sealers may have some biological properties, their primary function is mechanical - filling voids and creating hermetic seal around the core material.
70774
EndodonticsTraumatic injury to a tooth, such as a deep blow, can stimulate the formation of tertiary dentin or reparative dentin, which is a defensive response of the pulp to protect itself. This calcification process can lead to the gradual or even complete obliteration of the pulp chamber and canals, a condition known as pulp canal obliteration (PCO). The tooth remains vital but the pulp space is significantly reduced or fully closed
93820
EndodonticsSuproxol is a 30% hydrogen peroxide solution specifically used for bleaching discolored endodontically treated teeth. It is the gold standard for non-vital tooth bleaching because it has high concentration that provides effective bleaching, can penetrate dentin tubules to remove deep stains, and works well in the walking bleach technique. Ether and chloroform are solvents, not bleaching agents, while sodium hypochlorite is an irrigant, not a bleaching agent.