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NEET MDS Quiz - Practice Test
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Practice Test

Orthodontics - 3 Questions

1
Orthodontics

What is Sunday bite related to?

1) Angle’s class I with anterior open bite
2) Angle’s class I with anterior deep bite and posterior cross bite (unilateral)
3) Angle’s class II
4) Angle’s class III

📝 Explanation:

SOLUTION 

Children and adults with a skeletal Class II relationship and an underlying skeletal Class II jaw relationship position the mandible forward in a “Sunday bite,” making the occlusion look better than it really is.

2
Orthodontics
If PMBAW% is 44 in Howe"s analysis, it indicates
1) Extraction case
2) Expansion case
3) Borderline case
4) None of the above

📝 Explanation:

  • The primary purpose of Howe's Analysis is to assess the width of the dental arches and to identify any discrepancies between the maxillary (upper) and mandibular (lower) arches. This is particularly important in cases of malocclusion, where the alignment of the teeth and the relationship between the jaws may be compromised.

 

  • The analysis involves measuring specific distances on the dental casts, including:
    • Intercanine Width: The distance between the cusp tips of the canines.
    • Interpremolar Width: The distance between the cusp tips of the first premolars.
    • Intermolar Width: The distance between the cusp tips of the first molars.
  • These measurements are used to calculate the Percentage of Maxillary Buccal Arch Width (PMBAW%), which is a key indicator in the analysis.

 

  • The results of Howe's Analysis can indicate different treatment needs:
    • Normal Case: A PMBAW% within a certain range (typically around 50-60%).
    • Narrow Case: A PMBAW% below the normal range, indicating a need for arch expansion.
    • Wide Case: A PMBAW% above the normal range, which may suggest the need for extraction or other interventions.
    • Borderline Case: A PMBAW% around 44, indicating that the arch width is at a threshold where careful consideration is needed for treatment options.

3
Orthodontics

Facial profile of a typical mouth breather is

1) Long and wide     
2) Short and wide
3) Long and narrow     
4) Short and narrow

📝 Explanation:

SOLUTION

Altered respiratory pattern, such as breathing through the mouth rather than the nose, could change the posture of the
head, jaw, and tongue. This in turn could alter the equilibrium of pressures on the jaws and teeth and affect both jaw growth and tooth position. 
In order to breathe through the mouth, it is necessary to lower the mandible and tongue, and extend (tip back) the head. 

If these postural changes were maintained, face height would increase, and posterior teeth would super-erupt;
unless there was unusual vertical growth of the ramus, the mandible would rotate down and back, opening the bite
anteriorly and increasing overjet; and increased pressure from the stretched cheeks might cause a narrower maxillary dental arch.

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