Orthodontics Shorts - NEET MDS Dental PG Prep

#1 Orthodontics

SOLUTION

The type of welding used to join Orthodontic components is called Spot welding. The heat source usually a high amperage electricity. Orthodontic spot welders employ the electrode technique, in which current is conducted through two copper electrodes. The copper electrode in a welding unit serve the following purposes :

1. Transmit current to the metals to be joined so as to cause a rapid increase in temperature.
2. The electrodes help in conducting the heat produced away from the area so as to preserve the properties of stainless steel around the weld spot.
3. The electrode also help in holding together the two metals to be joined.
4. The electrodes are designed to apply pressure on the metals being joined. As soon as the temperature increases, the pressure exerted by the electrodes helps in squeezing metal into each other.

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Answer

The basic principle of Orthodontic spot welder lies on the concept of :-

1 Heat technique
2) Quenching
3) Diodelasers
4) Electrode Technique

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#2 Orthodontics

The labial bow is a component of the maxillary denture framework that helps in stabilizing the denture and providing support. The diameter of the labial bow is typically measured to ensure proper fit and function. The standard range for the diameter of the labial bow is generally accepted to be between 0.7 mm and 0.8 mm

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Answer

The diameter of labial-bow of the maxillary plate
1) 0.5-0.6 mm
2) 0.6-0.8 mm
3) 0.7-0.8 mm
4) 0.8-1.0 mm

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#3 Orthodontics

Classification of appliances for thumb-sucking

1. Removable appliances- These are passive appliances. These are retained in the oral cavity by means of clasps and they norm have one of these following additional components:
a. Tongue spikes
b. Tongue guard
c. Spurs/rake

2 Fixed appliances

a. Quad helix
b. Hay rakes
c. Maxillary lingual arch with palatal crib

The ideal appliance to correct posterior cross-bite caused due to digit sucking is Quad Helix. It is a lingual arch which is adjustab and needs very little patient cooperation because it is fixed and is reliable and easy to use.

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Answer

Which of these is the ideal appliance for correction of posterior cross bite due to digit sucking habit?

1) Tongue spikes
2) Hay rakes
3) Maxillary lingual arch with palatal crib
4) Quad helix

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#4 Orthodontics

Contraindications for activator include high FMA angle, severe protruded maxilla, and severe crowding. It is indicated for growing patients.

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Answer

Contraindications of activator are all except
1) High FMA angle
2) Severe protruded maxilla
3) Growing patient
4) Severe crowding

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#5 Orthodontics

The lymphoid system, which includes lymph nodes, spleen, and other lymphatic tissues, undergoes significant growth during childhood. By the age of 9-10 years, the lymphoid tissue can reach approximately 200% of its adult size due to the increased demand for immune function during this period. This growth is part of the body's preparation for increased exposure to pathogens as children interact more with their environment.

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Answer

Which of the following shows 200 % of its adult growth by age 9-10 years
1) Lymphoid
2) General
3) Genital
4) Neural

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#6 Orthodontics

Distal shoe is used for premature loss of a primary second molar before the eruption of the permanent first molar.

Space regainers are used when space has already been lost.

Nance holding arch or other extensive maintainers are unnecessary for a single, late-stage primary first molar loss with good arch stability.

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Answer

Space management in the case of loss of primary first molar in a 10-year-old girl is by
1) Distal shoe appliance
2) Space regains
3) No treatment, radiographic observation
4) Nancy holding arch

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#7 Orthodontics

Passive tooth-borne functional appliances are removable and do not require active muscle participation, such as Andersen activator, Woodside and Hawley activator, and expansion activator. The Herbst appliance is a fixed functional appliance.

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Answer

All the following are passive tooth borne functional appliances except
1) Andersen activator
2) Woodside and Hawley activator
3) Expansion activator
4) Herbst appliance

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#8 Orthodontics

SOLUTION

Maxillary splint appliance will hold the maxilla and worsen skeletal Cl –III malocclusion.

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Answer

Which appliance is not suitable for skeletal Class –III malocclusion at the age of 8 years?

1) Frankel III
2) Activator III
3) Chin cap
4) Maxillary splint appliance

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#9 Orthodontics

A high FMA angle indicates a vertical growth pattern, which is associated with a poorer prognosis for Class II correction due to increased difficulty in achieving stable results.

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Answer

High FMA angle indicates
1) Good prognosis
2) Bad prognosis
3) Good bone growth
4) Class III relation

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