MDS PREP
While combining NaOCH and H2O2 as irrigants
1) H2O2 should be used last
2) NaOCH should be used last
3) First irrigation should be done by normal saline
4) NaOCH and H2O2 should never be used simultaneously
Endodontics Answer: 2
Because residual H2O2 might react with debris and produce gas that can cause continuous pain.
Term "apical collar" (or) "apical seat" refers to
1. Resistance form of canal preparation
2. Located in apical 2 mm with parallel walls
3. Mechanically prepared portion of root canal
4. All of the above
Endodontics
Answer: 4
Which of the following fractures of tooth was poorest prognosis
1) Horizontal fractures at gingival level
2) Vertical root fractures
3) Horizontal fractures at apical third of root
4) Horizontal fractures at middle third or root
Endodontics
Answer: 2
Vertical root fractures are often associated with a poor prognosis because they can lead to significant loss of tooth structure and are difficult to treat. They typically result in the need for extraction, especially if they extend into the periodontal ligament or if the fracture is not detected early.
There is a real relationship between the incidence of fractured anterior teeth and the
1. Caries in those teeth
2. Hardness of the enamel
3. Hardness of the dentin
4. Protrusion of those teeth
Endodontics
Answer: 4
Explanation: Protruded anterior teeth are more susceptible to trauma and
fractures due to their position and exposure. This anatomical relationship
highlights the importance of considering tooth positioning in dental trauma
cases.
Endodontic therapy is said to be successful when following changes occur in periapical region
1. Formation of cementum
2. Regeneration of alveolar bone
3. Regeneration of PD ligament
4. All of the above
Endodontics
Answer: 4
When it comes to assessing the success of endodontic therapy, the changes that
occur in the periapical region are crucial indicators. A successful treatment
typically results in the formation of new cementum, regeneration of the alveolar
bone, and regeneration of the periodontal ligament. These processes are all part
of the body's natural healing response to the removal of infection and the
introduction of a biocompatible filling material in the root canal system. Thus,
all of the above factors contribute to the overall success of the treatment.
Most frequent failures of root canal treated cases are due to
1. Inadequate obturation
2. Improper sterilization
3. Improper preparation
4. All of the above
Endodontics
Answer: 1
The most frequent failures of root canal treated cases are often due to
inadequate obturation. This can occur when the root canal filling material does
not completely fill the space or when it is not properly compacted, leaving gaps
where bacteria can persist and cause reinfection. Proper preparation and
sterilization are also crucial, but inadequate obturation is the most common
technical error leading to treatment failure.
Formocresol produces tissue fixation and
1. Coagulative necrosis
2. Liquefactive necrosis
3. Cassious necrosis
4. Produces no necrosis
Endodontics
Answer: 1
Formocresol is a commonly used fixative and disinfectant in endodontic
treatment. It is known to produce tissue fixation by causing coagulative
necrosis. This is the process by which the proteins within the tissue are
coagulated or precipitated, leading to the death of cells due to dehydration and
denaturation. The necrotic tissue is then replaced by a fibrous connective
tissue, which is essential for the healing process in the periapical region
following root canal treatment.
Pulp exposures of crowns come under which class according to WHO nomenclature
1. 873.60
2. 873.61
3. 873.62
4. 873.63
Endodontics
Answer: 3
Explanation: According to the WHO classification of dental injuries, pulp exposures due to crown fractures are classified under 873.62. This classification helps in standardizing the terminology used in dental trauma, allowing for better communication and understanding among dental professionals.873.60 - Pulp Exposure due to TraumaThis code refers to cases where the pulp is exposed as a result of trauma to the tooth. It does not specify whether the pulp is vital or non-vital, but it indicates that there is a direct exposure of the pulp tissue.873.61 - Avulsion of ToothThis code is used for cases where a tooth has been completely displaced from its socket (avulsed). In avulsion cases, the pulp is typically exposed, and immediate re-implantation is critical for the best prognosis. This classification highlights the severity of the injury and the need for urgent treatment.873.62 - Crown Fracture with Pulp InvolvementThis code refers to fractures of the crown of the tooth that involve the pulp. It indicates that the fracture has extended into the pulp chamber, necessitating treatment such as root canal therapy.873.63 - Crown Fracture without Pulp InvolvementThis code is used for crown fractures that do not involve the pulp. In these cases, the injury is limited to the enamel and dentin, and the pulp remains intact.