Premature exfoliation of deciduous teeth is seen in hypophosphatasia.

The main aim of restoration of carious lesions in phase-I therapy is to reduce microbial source.

Chronic granulocytic leukemia is due to chromosomal translocation.

Answer: 2) Dilatation (bronchodilatation)
Explanation: Epinephrine acts on beta-2 adrenergic receptors in the bronchial smooth muscles, leading to their relaxation and dilatation of the bronchioles. This allows for increased airflow and oxygenation of the lungs, which is essential during the fight-or-flight response.

Minor oral surgery should be performed one day after dialysis in a patient who is on periodic renal dialysis. This is because the patient's platelet count and coagulation factors are usually at their lowest before dialysis, which could increase the risk of bleeding.