Clincial analysis of facial form Flashcards
what matters from the frontal view
Symmetry
Vertical and transverse facial proportions
tooth display
what matters from the lateral view
Anteroposterior jaw relationships
inciscor protusion or retrusion
what is done first when looking at the face
evaluate enough facial asymmetry to cause a problem
what side of the face tends to be larger
right
what is often included in facial asymmetry
mandible
then nose
what tends to be off in many asymmetric faces
nose
chin
how far does the mandible deviate before it is noticable
4mm
what is the second most important symmetry relationship
midline of the upper and lower dental arches to the skeltal midline
what is the maximum tolerable value of midline shift
2.9mm
how can the width of the face be devided
central region and 2 lateral regions on each side
- all roughly the same width
how wide should eyes be
the same width of one eye is the distance between the eyes
how wide should a nose be
the same as the distance between the eyes
how wide should a mouth be
inter-pupillary distance
how wide should the mandible be
at the gonial angles, it should equal the width across the eyes
how is the face devided vertically
highline to bridge of nose
bridge of nose to bottom of nose
bottom of nose to chin
- equal, iwth bottom a bit longer
where should the mouth be placed on the face
1/3 of the distance from the nose base to chin
how much tooth display is there at rest
2-4 mm(more in younger children)
how big is the enjoyment smile
enough to show gingiva
how big is the social smile
100% exposure of max incisor with small amounts of gingiva - minimal
-75% of incisor is minimum
what happens if the buccal corridor is large
non-asthetic, and should widden mouth
what happens if buccal corridor is too smile
undo the wideness
what is the smile arc
relationship of the curve of the lower lip on smile to the contours of the maxillary dentition
what is the ideal smile arc
follows that of the lower lip
what is the deal breaker of smile evaluation
smile arc- cant overcome with other aspects of ortho
what do contours of the soft tissue repressent
the bony tissue underneith
what is the problem with skeletal class II
hard to make normal dental occclusion possible
how much of the population is class III
1-2%
short faces are associated with what occlusion
deep overbite
what are the 6 major q’s to be answered in facial form analysis
- what is the anteroposterior position of each jaw and how do they relate
- what are the vertical facial proportions, especially the lower 1/3
- is the face symmetic
- are the upper incisors in the center of the face, are the buccal corridors normal
- are incisors correctly possitioned so that incisor display in optimal
- do they provide correct lip support
how is lip position and incisor prominence evaluated
viewing the profile with lips relaxed and observing the position of the upper lip relative to the true vertical line through the concavity at the base of the upper lip
the position of the lower lip relative to a true verticle line through the bottom of the concavity between the lip and chin is observed
when are the anterior teeth seen as excessively protrusive
when lips are prominent, impcompetent(separated) and strained on clusre
