Growth Flashcards
What are the 3 pieces of evidence of somatic growth status?
- Time and duration
- Physiological indications- menarche, voice change
- Vertebral maturation
Elaborate on time and duration of growth
authors
context girl/boy
conclusion
Taranger and Hagg
swedish children average ONSET, PEAK, END of adolescent height growth and duration
Females: onset 10
Males: onset 12
onset to peak height velocity is 2 years, to end is 5 years
onset-2-PHV-5-end
Elaborate on physiological indicators
authors
context girl/boy
conclusion
Hagg and Taranger
girls: menarche average 12 months after PHV (growth rate is decelerating) but growth modification still applicable because growth is still happening
boys: prepubertal = not yet PHV, voice change = currently reaching PHV, male voice = deceleration.
no boys will reach end of pubertal spurt without having male voice
Elaborate on Vertebral indicators
Authors
context
refer to McNamara and Franchi
C2-C4, CS1-CS6
Prepubertal x2, circumpubertal x2 (PHV), postpubertal x2
1-2: C2 becomes concave but C3 and C4 still trapezoid
2-3: C3 becomes concave, C4 can turn rectangular horizontal
3-4: all are curved now, becoming rectangular
5&6: C3 C4 getting longer, going from square to vertical
Why do you gotta know somatic growth
Shines light on patient's growth stage based on growth rate- onsent, prepubertal, PHV, post pubertal, little to no more growth guides clinicians on treatment: when to start hong long to delay duration window of treatment opportunity
How does the maxillary face grow normally?
direction of growth is downwards and forwards (equal P/A and R/L)
from: nasal cartilage (growth centre), sutural growth (growth site), surface remodelling (growth site)
angle from A point to SN line is 50 degrees
What happens when the maxilla grows wonky?
R/L: cant
P/A: skeletal open bite, deep bite
cleft lip/palate repair surgery stops growth, redirection of growth vertically through mandibular growth
How does the maxillary face grow normally?
direction of growth is downwards and forward
from: condylar growth (growth site), mandibular body elongation, surface remodelling
infuenced by facial and oral soft tissue muscle environment, changes direction of mandibular growth
bolton-brush study
What happens when the mandible grows wonky
chin point deviation, occlusal plane parallel to infra-orbital margins
Syndromes that give you wonky occlusion (4)
goldenhar syndrome, hemifacial microsomia, treacher collins, binder syndrome
forward growth rotation
Condylar inclination: vertical/forward mandibular canal: more curved Shape of border of mandible: convex symphysis inclination: forward strong chin inter-incisal angle: obtuse inter-molar/inter-pm angle: obtuse LAFH: decreased
backward growth rotation
Condylar inclination: backward mandibular canal: less curvature Shape of border of mandible: antegonial notch symphysis inclination: weak chin inter-incisal angle: more acute inter-molar/inter-pm angle: more acute LAFH: increased
Dento-alveolar compensatory mechanism definition
Beni Solow
due to large individual variability in jaw growth
physiological process by which development is controlled so as to secure occlusion of teeth and adaptation
attempts to maintain normal inter-arch relationships under varying jaw relationships
dento-alveolar compensation factors
healthy eruptive system
forces of soft tissue
adequate means its good occlusal relationship but may have crowding
inadequate means abnormal occlusion (rate of growth > teeth adaptation)
DAC and inter-incisal angle
interincisal angle should be 120-130 (chinese), 125-135 (angmoh).
changing ANB can still have ideal interincisor angle
