MDS PREP
Identify the wrong statement about supragingival calculus
1) Forms readily in alkaline environment from plaque
2) Mineral contents derived from saliva
3) More common on lingual side of lower incisors
4) Mechanically irritating to gingiva
Periodontics
Answer: 4
The threshold dose of fluoride that requires immediate emergency treatment and hospitalization in acute fluoride toxicity is
1) 4 mg
2) 5 mg
3) 6 mg
4) 7 mg
Community Dentistry
Answer: 3
Ulcer with a watery discharge is typical of
1) Leprosy
2) Tuberculosis
3) Venous ulcer
4) Tropical ulcer
Oral medicine
Answer: 2
Neurological complications of meningitis include all of the following except:
1. Seizures
2. Increases intracranial pressure
3. Cerebral hematoma
4. Subdural effusions
Which of the following statements is false?
1) The upper first premolar usually has two canals
2) Root canal instruments are best sterilized by a chemical method
3) All root canals must be enlarged to at least a size 25 file
4) All are false
Endodontics
Answer: 2
1) The upper first premolar usually has two canals: This statement is true. While the presence of two canals in the upper first premolar is not guaranteed, it is quite common to find two canals in this tooth.
2) Root canal instruments are best sterilized by a chemical method: This statement is false. The best method for sterilizing root canal instruments is heat sterilization using an autoclave. Chemical methods can be used for surface disinfection but are not adequate for sterilization.
3) All root canals must be enlarged to at least a size 25 file: This statement is true. Enlarging the root canals to a size 25 or larger is a part of the cleaning and shaping process in root canal therapy to ensure thorough debridement and preparation for filling.