1. Clinical Exam Flashcards
Goal of preventative ortho is
preserve the integrity of developing occlusion (i.e space maintainer and habit breaker)
Goal of interceptive ortho
Abnormal situation already exists (i.e extractions, headgear for Class II malocclusion, and eliminating habits)
Goal of corrective ortho
Existence of malocclusion is recognized (special training usually required for these cases)
What are the three facial types and define them
- Leptoprosopia= long face
- Mesopropsopia= oval face
- Eurvprosopia= short broad face
What are the three major anatomic landmarks that divide the head into third vertical thirds
Hairline
Glabella- most prominent point on the forehead in the mid-sagittal plane
Subnasale- junction of the columella with the upper cutaneous lip in the midsagittal plane
Menton= Most inferior contour of the soft tissue chin in the midsagittal plane.
In skeletal open bite cases the lower third dimensions of the face will be (increased/decreased) while skeletal deep bite cases will be….
increased…. decreased .
Width of the face is divided into how many sections and what are the boundaries
5
- Lateral margins of the ears
- Outher canthus of eyes
- Inner canthus of eyes
- Central nasal area (inter-alae distance)
Inner canthus of the eye should pass tangent to
alae of the nose
T/F Proportions of head width can generally be changed with treatment
f
Describe nasion
deepest depression of the bridge of the nose in the midsagittal plane
Nasion to subnasale is _% of facial height
43%
Facial height from subnasale to menton is _%
57%
In skeletal open bite cases the facial height between subnasale and menton will be (greater than/less than) 57%? Deep bite?
Open bite= greater
Deep bite= less
Upper facial contour plane is defined by what two points
Glabella and subnasale
Lower facial contour plane is defined by what two points
subnasale to pogonion
Pogonion is where
most prominent point on the soft tissue chin
What angle range btwn the upper and lower facial contour lines defines a straight face? Convex? And Concave?
Striaght= 8-12 degrees Convex= 20 degrees or more Concave= 0 degrees or less
Convex facial profile is associated with angles class (I/II/III) Occlusion and Concave?
II, III
Long faced individuals tend to have excessive exposure of
maxillary incisors and gums (gummy smile)
Normal exposure for maxillary centrals is
1-3 mm (male)
Up to 5 mm (Female)
Short faced individuals have what problem with their upper lip contrary to long faced peopel
Lips appear protrusive and everted
T/F Class II or III occlusion can occur in either long or short face
t
Lip position is assessed how
relating the lips to the lower facial contour plane
or
Nasolabial angle
In the relaxed state the upper lip at the vermillion boarder and the lower lip vermillion boarder Are _ mm ahead of the lower facial contour plane
- 5 mm (upper lip)
2. 2 mm (lower lip)
The nasolabial angle is formed by
the intersection of a line tangent to the columella of the nose with a line drawn from the most anterior point on the upper lip to subnasale
Nasolabial angle averages for males and females are
Male= 100-110 degrees Female= 110-120 degrees
Bidental protrusion of both the upper and lower lips ahead of the lower facial contour plane ususally indicates what for treatment
extractions of first premolars
When should extractions be avoided
Lower lip is retrusive or when the “chin button” is excessive (Will permit “collapse” of the lower lip)
