MDS PREP
D2 on the endodontic file indicates
1) Diameter at tip of instrument
2) Angle of instrument
3) Length of instrument
4) 1/100th mm at end of cutting blade
Endodontics
Answer: 4
The designation "D2" on an endodontic file indicates the diameter of the file at
the tip, measured in hundredths of a millimeter. This helps clinicians select
the appropriate file size for root canal treatment.
In hot bead sterilizer, temperature is highest in
1. Inner zone of the sterilizer
2. Outer zone of the sterilizer
3. Equal in both outer and inner zone
4. Variable
Endodontics
Answer: 2
In a hot bead sterilizer, the temperature is highest in the inner zone of the sterilizer. A hot bead sterilizer uses a heated metal bead to transfer heat to the instruments, which are placed around the bead in a basket. The inner zone is where the bead is located and where the temperature can reach up to 300°C, which is sufficient to kill microorganisms and sterilize the instruments. The outer zone is cooler and does not contribute significantly to the sterilization process.
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
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.
Operator can identify root curvatures ledgings an additional curvatures by
1. Perception by instrumentation
2. Radiographic examination
3. By his knowledge of tooth anatomy
4. None of the above
Endodontics
Answer: 1
Identifying Root Curvatures
Perception by instrumentation refers to the tactile
feedback that a dentist can obtain while using instruments during
procedures, allowing them to identify curvatures in the root canal system.
The filling of choice for primary root canals
1. ZOE
2. Calcium hydroxide
3. Gutta-percha
4. Chlorpercha
Endodontics
Answer: 1
Zinc oxide eugenol is commonly used as a filling material for primary root canals due to its biocompatibility and sealing properties.
In class IV anterior tooth fracture
1. No treatment possible
2. Treatment to be given but it is problematic
3. No treatment required
4. None of the above
Endodontics
Answer: 2
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.
The length of the instrument used for endodontic implants is
1) 25 mm
2) 28 mm
3) 21 mm
4) 40 mm
Endodontics
Answer: 4
Endodontic instruments, particularly those used for root canal treatment and
implants, typically have a length of around 40 mm. This length allows for
adequate reach into the root canals of most teeth, which can vary in depth.
Instruments shorter than this may not effectively reach the apical areas of the
root canals.