Shorts

Solution

This is because elastic supracrestal fibres remodel extremely slowly and can still exert forces capable of displacing a tooth even at 1 year after removal of an orthodontic appliance.

SOLUTION
· Pont’s in 1905 presented a system whereby the measurement of the four maxillary incisors automatically established the width of the arch in the premolar and molar region.  If measured value is less than calculated value, it indicates the need for expansion. 

· Linder Harth index: This analysis is very similar to Pont’s analysis except that a new formula has been proposed to determine the calculated premolar and molar value. 

· Korkhaus analysis: This analysis is also very similar to Pont’s analysis it makes use of Linder Harth’s formula to determine the ideal arch width in the premolar and molar region.
 In addition this analysis utilizes a measurement made from the midpoint of the inter-premolar line to a point in between the two maxillary incisors. 
 
· Bolton’s analysis: The Bolton’s analysis helps in determining disproportion in size between maxillary and mandibular teeth. 

The labial bow in an activator is constructed with 0.8 mm wire, slightly heavier to provide stability and retention.

In a child with a skeletal Class I relationship and slight overjet, thumb sucking can contribute to the maintenance of the overjet due to the anterior teeth being pushed forward by the thumb. If the child discontinues thumb sucking, the anterior teeth may naturally reposition themselves, leading to a reduction in overjet.
Option 2 is incorrect because while the eruption of permanent canines can influence the occlusion.
Option 3 is also incorrect; the lower incisors would not necessarily incline labially if the thumb sucking habit is stopped.

Terms used to describe the position of teeth.

Mesioversion - A tooth in the arch located more mesial than normal
Distoversion - A tooth in the arch located more distal than normal
Labioversion - An incisor or canine outside of arch towards the lips
Buccoversion - A  posterior tooth outside the arch toward the cheek
Linguoversion - A  tooth inside the arch form toward the tongue
Infraversion  - A tooth that has not erupted to the occlusal plane
Supraversion - A tooth the has over-erupted
Torsiversion - A tooth rotated on its axis
Transversion (Transposition) - Teeth that are in the wrong sequential order.

SOLUTION

 

SOLUTION

The reason is found in the concept of "dental compensation for skeletal discrepancy.  This can occur naturally as well as being created by orthodontic camouflage treatment.

In mandibular prognathism, for instance, as the individual grows the upper incisors tend to protrude while the lower incisors incline lingually.

By the time growth is completed, the dental discrepancy usually is smaller than the jaw discrepancy. 

Tooth position has compensated at least partially for the jaw discrepancy.

Thumb sucking-  Dental experts advise that children should be encouraged to stop the habit by age 4 to prevent structural changes in the mouth