MDS PREP
A patient is allergic to PABA. Most probably he will also be allergic to
1) Lignocaine
2) Carbocaine
3) Prilocaine
4) Tetracaine
Oral Surgery
Answer: 4
Patients who are allergic to PABA (para-aminobenzoic acid) are likely to be allergic to tetracaine. This is because PABA is a common metabolite of amide-type local anesthetics, and tetracaine is also an amide anesthetic. Lignocaine and prilocaine are both ester-type anesthetics, which have different chemical structures and metabolic pathways, making an allergic reaction less likely in a patient with a PABA allergy. Carbocaine is a derivative of mepivacaine, which is also an amide, but the specificity of the allergy may not necessarily cross-react with all amide anesthetics.
What is the significance of winter lines in diagnosing impaction?
1) They indicate the age at which impaction occurred
2) They indicate the presence of an impacted tooth
3) They do not have direct significance in diagnosing impaction
4) They indicate the severity of the impaction
Oral and Maxillofacial Surgery
Answer: 3
Winter lines are not directly related to the diagnosis of
impaction. Their presence on teeth indicates periods of tooth development
disturbances, but they do not provide specific information about the presence or
severity of an impacted tooth.
A 50-year-old obese man complains of several recent abscesses in the gingival with loosening of teeth. He also suffers from itching of skin and polyuria. The most probable aetiology is
1. Scurvy
2. Myxoedema
3. Diabetes mellitus
4. Vitamin A deficiency
Oral Pathology
Answer: 3
The most probable etiology for the man’s symptoms is Diabetes mellitus, given the signs of abscesses and polyuria.
A tooth makes its appearance in the oral cavity usually when
1. all of the crown is completed
2. all of the root is completed
3. one half of the root is completed
4. one half of the crown is completed
Dental Anatomy
Answer: 3
A tooth makes its appearance in the oral cavity usually when one half of the root is completed