Orthomidterm 2

robbypowell's version from 2016-03-02 16:57


this lecture looked pretty straightforward...
Question Answer
90-95% of neural growth is finished by what age?7 yo
mandibular growth more closely follows the ____ growth curvegeneral
maxillary growth more closely follows the ____ growth curveneural
adolescent growth spurt starts at ____ yo for girls and ___ yo for boys11; 13
do boys or girls have the longest adolescent growth spurt?boy (5 yrs vs. girls' 3.5)
what can menarche tell us about a girl's growth spurt?toward end, well after peak velocity
what can hair on upper lip tell us about boys growth spurt?appears just at point of peak velocity
what % of children with fractured condyle will have affected growth?20-25%


Question Answer
the ____ ____ is composed of line segments and shapes which relate to each other through the Golden or Divine Proportion (1:1.618)Phi Mask (or Facial Mask)
what is the "golden or divine proportion" that the Phi Mask is based on?1.618
Macro-esthetics of face refer to what?overall face
Mini-esthetics of face refer to what?lip/tooth area
micro-esthetic refer to what?dental view
Less than ____ mm of facial asymmetry goes unnoticed5mm
Many asymmetries originate in the ___ and may be due to deficient or excessive growthmandible
The ideal face is ____ (#) eye-widths wide5 (rule of fifths)
Glabella (between eyebrows) to the base of the nose and upper lip and the most prominent point on the chin should all be on a ____ linestraight (vertical)
what are the 3 points for assessing profile?Glabella, Subnasion, Pogonion (prime)
A mildly ___ profile is considered normal in the prepubertal patient. This is usually related to the lag in mandibular growth with respect to maxillary growthconvex
A straight profile in a pre-pubertal patient indicates the presence of a developing class _________ skeletal patternClass 3
rule of fifths is used to assess the _____ of facewidth
rule of thirds is used to assess the _____ of faceheight (vertical)
t/f: competent lips touch at restTrue


soft tissue landmarks
Question Answer
midline point at the junction of the hairline and foreheadTrichion (Tr)
most prominent midline point of the forehead between the brow ridgesGlabella (G’)
deepest midline point on the nasal radixNasion (N’)
most prominent point on the nasal tipPronasale (Prn)
anterior most point on the columnellaColumnella (Cm)
midline point where the upper lip meets the columnellaSubnasale (Sn)
midline point representing the mucocutaneous border of the upper lipLabrale Superioris (Ls)
the most anterior point of contact between the upper and lower lips when in reposeStomion (St)
midline point representing the mucocutaneous of the lower lipLabrale Inferioris (Li)
the most prominent point on the soft tissue chinPogonion (Pg’)
most inferior midline point on the soft tissue chinMenton (Me’)


normal numbers
Question Answer
Normal nasolabial angle range90-120 deg
upper lip distance from Rickett's E-line-4 (give or take 2)
lower lip distance from Rickett's E-line-2 (give or take 2)
normal depth of mentolabial sulcus4 mm (give or take 2)
Optimal Interlabial Gap0-3 mm
_________ to ___ mm of gingival display at full smile is acceptable1-2
how much of the exposed tooth is optimal to see at full smile?all of tooth (w/ 1-2mm ging display)
Lip Length (height) males; females22mm; 20mm
Average lip elevation at smile is ___ to ___ mm7-8
Mid-Philtral height should be equal to or no more than ____ less than commissure height.3mm


Question Answer
Science dealing with measurement of the skullcraniometrics
method for quantitatively measuring decriptive information about the dentofacial complex from a lateral head film taken under standardized conditions.Cephalometrics
when taking a lat-ceps... how far is the X-ray tube from the mid-sagittal?60 inches (5 ft)
when taking a lat-ceph... how far is the film/sensor from the mid-sagittal?15 inches
Central x-ray beam passes through transmeatal axis at ___ degrees to film90 deg
which plane is horizontal when we take a lat ceph?Frankfort horizontal
what side of the hide is least magnified on lat-ceph?Left side (closer to film)
if the source (of lat-ceph) is closer to patient does this create more or less magnification?more
if the source (of lat-ceph) is further from patient does this creat more or less magnification?less
vector of growth is _____ and ____down & forward
most stable skeletal landmark despite growthSella Turcica
what is the name for meeting of anterior clinoid process and sella turcica?Walker's point
what is the name for the meeting of post cranial base and foramen magnum?Boltmann's point
when does the spheno-occipital synchondrosis close?late teens
what teeth are traced on cephalogram?first molars & central incisors


skeletal points
Question Answer
most anterior point of intersection between the nasal and frontal bonesNasion (Na)
most superior point of the external auditory meatusPorion (Po)
lowest point on the inferior margin of the orbitOrbitale (Or)
most anterior point on the maxilla at the level of the palatal planeAnterior Nasal Spine (ANS)
most posterior point on the outline of the maxilla between ANS and the Alveolar crestA point (subspinale)
most posterior point on the contour of the mandible between the alveolar crest and the bony chinB point
most anterior point on the contour of the bony chinPogonion (Pg)
lowest or most inferior point on the symphyseal outlineMenton (Me)
Midway point between pogonion and mentonGnathion (Gn)
most posterior and inferior point at the angle of the mandibleGonion (Go)
midpoint in the saggital plane on the anterior rim of the foramen magnumBasion (Ba)
most posterior point of foramen magnumOpsithion


planes and angles
Question Answer
what plane represents anterior cranial base?SN plane (sella-nasion)
represents a horizontal reference plane that is perpendicular to the floorFrankfort Horizontal (Porion-Orbitale)
which plane represent the angle of the mandible?Mandibular Plane (Menton-Gonion)
adult normal range for ANB angle0-4 deg
angle used to determine the AP position of the maxilla in relation to the anterior cranial baseSNA angle
normal range for SNA angle80-84 degrees
angle used to evaluate the mandibular postion relative to the cranial baseSNB angle
normal range for SNA angle78-82 degrees
angle used to characterize a patient’s facial type or growth patternSN-MP (formed between the SN plane and the MP)
normal SN-MP angle range27-35 degrees (31 plus-minus 4)
Normal range of FMA22-30 degrees
the norm of upper facial height/anterior facial height (%)45%
the norm of lower facial height/anterior facial height (%)55%
norm angle for upper incisor to SN plane111 (+-6)
norm angle for lower incisor to Mandibular plane (IMPA)93 (+-5)