craniofacial growth

Question 1

What are the three factors to consider in evaluating somatic growth

Answer 1

• Timing and duration
• Physiologic indicators
• Vertebral maturation

Question 2

Onset of growth, PHV, end of growth for female and males

Answer 2

Female: 10, 12, 17
Male: 12, 14, 19

Question 3

physiologic indicators for female and male and what do they signify

Answer 3

• Female: menarcheMenarche occurs 12 months after PHV. Peak already over and growth is decelerating, but there is still growth potential
• Male: voice changeIf voice change has begun, the boy is IN pubertal growth spurt. Male voice means that growth rate has begun to decelerate

Question 4

when is the ideal treatment period for growth modification

Answer 4

Ideal treatment period is late accelerative to PHV to mid decelerative phase

Question 5

Compare features of forward vs backward mandibular growth rotation

Answer 5

• Condyle inclination

    Forward: forward/vertical
  
    Backward: backward 

  • Curvature of mandibular canalForward: GreaterBackward: Less
  • Mandibular border shapeForward: ConvexBackward: Antegonial notch
  • SymphysisForward: Forward symphysis, prominent chinBackward: Backward symphysis, weak chin
  • Interincisal angleForward: ObtuseBackward: Acute
  • LAFHForward: DecreasedBackward: Increased

Question 6

Define DAC

Answer 6

Dentoalveolar compensation is a physiologic mechanism by which development of dental and alveolar arches are controlled to secure occlusion and adaptation to basal parts of the jaw. This helps to maintain normal arch relationship with varying jaw relationships

Question 7

What are the factors affecting DAC

Answer 7

• Healthy eruptive system for continuous eruption of teeth during growth
• Forces acting on teeth by soft tissues

Question 8

What is the mechanism of DAC

Answer 8

Vertical discrepancy

• Increased LAFH: mand and max incisors retrocline
• Decreased LAFH: mand and max incisors procline

Sagittal discrepancy

• class II max incisors retrocline, mand incisors procline
• class III max incisors procline, mand incisors retrocline

Transverse discrepancy
- narrow maxillary and wide mandibular base: buccal tilting of upper teeth and alveolar arches, lingual tilting of lower teeth and alveolar arches