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Orthodontics - 3 Questions
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
SOLUTION
Maxillary splint appliance will hold the maxilla and worsen skeletal Cl –III malocclusion.
Analysis which is similar to Pont’s analysis is_______?
1) Linder Harth index 2) Korkhaus analysis 3) Bolton’s analysis 4) (A) and (B)
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 cranial vault, which protects the brain, closely follows the neural growth curve, characterized by rapid growth early in life. Neural tissue (brain, spinal cord, eyes, and related structures) grows very rapidly in early childhood, reaching nearly adult size by age 6 or 7. The cranial vault growth mirrors this to accommodate the expanding brain. Somatic or general tissue (skeletal, muscular, and most visceral organs) follows an S-shaped curve, with steady growth in childhood, a rapid spurt during puberty, and then leveling off. Dental tissue has a unique growth pattern related to the eruption of deciduous and permanent teeth. Genital tissue (reproductive organs) remains largely dormant during childhood and experiences a dramatic growth spurt during puberty.
MCQ