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1. Root resorption in primary deciduous central incisor start by
- 6 months
- 4 year
- 5 year
- 2 year
ANSWER b
Physiologic root resorption occur from the apex of the primary teeth close to the permanent teeth towards the apex.
2. Correct jaw position at birth in a normal child is
- Both jaws at same level
- Maxilla prognathic mandible retrognathic
- Mandibular prognathic
- Maxilla prognathic
ANSWER b
In proper jaw alignment, the upper jaw and teeth project slightly farther than the lower teeth.
If the jaws are not properly aligned, child may experience difficulty chewing food, difficulty biting into food, breathing problems or jaw pain. Misalignment of the jaw can also put the teeth at risk for becoming worn down.
3. Most of the structure of oral cavity are formed by
- Endodermal layer
- Mesodermal layer
- Ectodermal layer
- Ectoderm and mesoderm
ANSWER d
4. According to the hydrodynamic theory of dentin sensitivity the movement of fluid through dentinal tubules
- Stimulates the sensory nerve fibers of the underlying pulp
- Displaces odontoblasts into the pulp tissue
- Has minimal effect on the odontoblast
- Result in the death of many odontoblast
ANSWER c
Dentin Hypersensitivity is defined as short, sharp pain arising from exposed dentin in response to stimuli typically thermal, evaporative, tactile, osmotic or chemical and which cannot be ascribed to any other dental defect or pathology.
Mechanism:
- Direct innervation theory(DI)
- Odontoblast receptor theory(OR)
- Fluid movement/Hydrodynamic theory
Hydrodynamic theory :
- Hydrodynamic theory proposed by Brannstorm is the most widely accepted theory for dentin hypersensitivity.
- According to him, when an appropriate stimulus is applied to the other dentin surface there is displacement of the fluid in the dentinal tubules.
- It claims that tubules are open between dentin surface which is then exposed to environment and pulp
- The intensity of the stimuli form A-delta intradentinal afferent fibers arise from the pulpal nerves.
- These stimuli include cooling, drying, evaporation and application of hypertonic chemical substances.
5. Neonatal teeth are defined as
- Teeth as erupt at birth
- Teeth that erupt within 30 days of birth
- Teeth that erupt after the 120 days
- Teeth that erupt within 45 days
ANSWER b
Natal teeth are teeth that are present when a baby is born. The teeth are often not fully developed and may have a weak root. Natal teeth are not common 'NEONATAL' teeth if they erupt during the first 30 days
