1st Class Flashcards
______ is a specialty branch of dentistry that deals with the
diagnosis, prevention, and correction of mal-positioned teeth and
jaws.
Orthodontics
It can also focus on modifying facial growth, known as ________
dentofacial orthopedics.
____ = straight
Ortho
_____ = tooth
Odont
__________ = The Science of Straight Teeth
Orthodontics
_________ created the first simple system for classifying malocclusion, a system which is still used today.
Edward Angle
What is the ideal occlusion in relation to first max molars?
Mesiobuccal cusp of the upper molar occludes in the buccal groove of the lower molar.
Angle’s postulate was that the ________ were the key to occlusion and that the upper and lower molars should be related so that the:
Mesiobuccal cusp of the upper molar occludes in the buccal groove of the lower molar.
upper first molars
Angle’s statement, which 100 years of experience has proved to be correct, except when there are aberrations in the ____ of teeth.
size
• Normal relationship of the molars, but line of occlusion incorrect because of malposed
teeth, rotations, or other causes.
•Class I:
• Lower molar distally positioned relative to upper molar, line of occlusion not specified.
- upper molar mesial
•Class II:
• Lower molar mesially positioned relative to upper molar, line of occlusion not specified.
- upper molar distal
•Class III:
Which class of angles is the most likely to be seen?
Class 2
Which class of angles can be described by 1/4, 1/2, 3/4, and full cusp classification?
Class 2
The canine classification says that the max canine should sit where on mandibular arch?
In embrasure btwn Mand canine and mand 1st PM
Class 2 Div _____:
Has proclined upper incisors
Class 2 Div 1
Class 2 Div ____:
Retroclined upper incisors
Class 2 Div 2
The ________ is a smooth (catenary) curve passing through the central
fossa of each upper molar and across the cingulum of the upper canine and
incisor teeth.
The same line runs along the buccal cusps and incisal edges of the lower teeth.
line of occlusion
Where does the line of occlusion run thru the maxillary teeth?
Central fossa of molars/PMs and across cingula of anteriors
Where does the line of occlusion run thru the mand teeth?
Buccal cusps and and incisal edges
Is proper occlusion the only thing needed to have balanced ortho stability?
No
Dr Tweed and Begg introduced ____ back into Ortho:
•Enhance facial esthetics
and
•Achieve better stability of the occlusal relationships.
Extraction of teeth
A ______ can be defined as a set of shared beliefs and
assumptions that represent the conceptual foundation of an
area of science or clinical practice.
paradigm
“Both the goals and limitations of modern orthodontic and
orthognathic surgeries are determined by the soft tissues of
the face, not by the teeth and bones.”
Soft tissue paradigm
•The primary goal of treatment becomes _______ relationships and adaptations, not Angle’s ideal occlusion.
soft tissue
The secondary goal of ortho treatment becomes _______
functional occlusion.
Contemporary thinking focuses more on soft tissues or skeletal disturbances/occlusion?
Soft tissue
\_\_\_\_\_\_\_ (Crowding) usually is expressed as the irregularity index. •The total of the millimeter distances from the contact point on each incisor tooth to the contact point that it should touch.
Incisor irregularity
_____ population show the higher percentage with moderate and severe crowding compared to other groups.
Hispanic
A space between adjacent teeth is called
a ______.
diastema
Spontaneous correction of a childhood
diastema is most likely when its width is
not more than ____ mm.
2 mm
_______ exists when the maxillary posterior teeth are lingually
positioned relative to the mandibular teeth.
Posterior crossbite
Posterior crossbite most often reflects a ______ maxillary dental arch but can
arise from other causes.
narrow
______ is defined as horizontal overlap of the incisors.
Overjet
If the lower incisors are in front of the upper incisors,
the condition is called _______ or _______
reverse overjet or anterior
crossbite.
_____ is defined as the vertical overlap of
the incisors.
Overbite
If there is no vertical overlap, it is called _______
open bite.
There is almost one chance in three
of an injury to a _____ incisor
protruding incisor
Do Most of the accidents occur during
normal activity or in sports?
Normal activity
