ackerman-proffit classification Flashcards
what did angle do
describe the ideal arrangement of teeth
how did angle define normal occlusion
arrangement of teeth relative to the line of occlusion
arrangement of maxillary teeth relative to the madibular teeth
what was angle’s belief about establishment of occlusion
people would look best when ideal occlusion obtained
forcecs against teeth would maintain them in possition
what was the primary goal of ortho to angle
align all 32 teeth in perfect relationship
- once obtained, everything else would fall into place
what problem did angle’ view cause
Extraction of teeth was never needed
ideal occlusion “always” lead to ideal face looks
dental protrusion was not a problem
what did case really dissagree with angle about
That expanding the dental arch was the goal
- coud lead to face deformity
how does angle feel about the arch length discrepency
Did not see it as a problem since he thought all dental arches could and should be expanded
what are the types of class I malocclusions
Dental crowding
Cross bite buccal or lingual
open/deep bite
what problem does strang have of angle classifcation
Only evaluates dental occlusion in the anteroposterior plane of sapce
does not include transverse or verticle fit
what are analogous problems
Similar problems
what are homologous problems
identicals
what is the problem with analgous problems
Mistakes in treatment
what is angle’s line
the functional line of occlusion
where is the esthetic line of dentins
Runs along the outer surface of the upper teeth
what does the esthetic line define
the extent of incisor display(evaluated in the context of dentofacial appearance)
what does the functional line
estimation of the extent of malalignment of the teeth
how does one specify the severity of the alignment field
space discrepancy by comparing space available for teeth and space required
how exact do we neeed to specify crowding
mild, moderate, and severe
what does the ackerman-proffit scheme look at
orientation relative to the 3 perpendicular axises of the face(pitch-up down,roll, yaw: right left)
what is pitch
an excessive up/down rotation of the dentition relative to natural head position and to the lips anc cheeks
what is roll
up or down on one side relative to the other
what is used to evalute roll
the facial soft tissues from the orientation of the esthetic line to the inter-commisure line
what tool is used to evalute roll
Fox plane
problem with a fox plane
impossible to see how the teeth relate to the intercommisure line
what is yaw
rotation of jaw or dentition to one side along a verticle axis
what does yaw problems lead to
creates a skeletal or dental midline discrepancy unilateral class II and CLass II molar relationship
