Six Keys to Normal Occlusion Flashcards
List the six keys to normal occlusion:
- molar relation
- crown angulation
- crown inclination
- rotations
- contact points
- occlusal plane
The distal marginal ridge of the maxillary first molar occludes on the mesial marginal ridge of the mandible second molar. This describes:
Key 1- Molar relation
Key 1- Molar relation:
The ____ marginal ridge of the maxillary first molar occludes on the _____ marginal ridge of the mandibular second molar
distal; mesial
Key 1- Molar relation describes the relationships between the:
(marginal ridges)
Distal marginal ridge of maxillary first molar; mesial marginal ridge of mandibular second molar
In this image what is the arrow pointing to? What does this satisfy?
Distal marginal ridge of maxillary first molar occluding with the mesial marginal ridge of the mandibular second molar
Key 1- Molar relation
Key 1- Molar relation:
the ____ cusp of the maxillary first molar must occlude on the _____ of the mandibular first molar
mesiolingual cusp; central fossa
According to Key 1- Molar relation, the mesiolignual cusp of the maxillary first molar must occlude:
on the central fossa of the mandibular first molar
Key 1- Molar relation describes the relationships between the:
(cusp & fossa)
The mesiolingual cusp of the maxillary first molar must occlude on the central fossa of the mandibular first molar
In this image, what are the arrows pointing to? What does this satisfy?
The mesiolingual cusp of the maxillary first molar occluding on the central fossa of the mandibular first molar; Key 1- Molar relation
According to Key 1- Molar relation, if the maxillary and mandibular molars are in normal relation, the _____ and _____ enjoy a cusp-embrasure relationship buccally and cusp-fossa relationship lingually
canine; premolar
According to Key 1- Molar relation, if the maxillary and mandibular molars are in normal relation, the canine and premolar enjoy a ______ relationship buccally and ______ relationship lingually
cusp-embrasure; cusp-fossa
In this image, what is the first arrow pointing to? What does this satisfy?
Canine & premolar enjoy a cusp-embrasure relationship buccally; Key 1- Molar relation
The gingival portion of the long axis of each tooth is distal to the incisal portion:
Key II- Crown angulation
According to Key II crown angulation:
The gingival portion the long axis of each tooth is distal to the incisal portion
What is this image showing?
Key II- Crown angulation: The gingival portion the long axis of each tooth is distal to the incisal portion
What is this image showing?
Key II- Crown angulation: The gingival portion the long axis of each tooth is distal to the incisal portion
The degree of tip of the incisors determines the among of mesiodistal space they consume:
Key II- Crown angulation
Key II- Crown angulation states that the degree of tip of the incisors determines the amount of:
mesiodistal space they consume
Key II- Crown angulation states the _________ determines the amount of mestiodistal space they consume
Degree of tip of the incisors
(Crown angulation)
+ Reading = _____ tip of the crown
- Reading = _____ tip of the crown
+: distal tip
-: mesial tip
Key III =
Crown inclination
Would the crown inclination in the following image be positive or negative?
Positive (+7) labiolingual inclination
Would the crown inclination in the following image be positive or negative?
Negative (-7) labiolingual inclination
Anterior teeth-torque falls under what key?
Key III- Crown inclination
According to Key III, the crown inclination should be _____ from canines through second molars
progressively increased
What is the ratio of inclination & angulation?
Ratio 4:1
What do we mean by saying there should be a ratio of 4:1 for inclination & angulation?
For every 4 degrees of lingual root torque there is 1 degree of mesial root tip
For every four degrees of _______ there is 1 degree of _____
lingual root torque; mesial root tip
A rotated molar occupies more mesiodistal space & a rotated anterior tooth occupies less mesiodistal space:
Key IV rotations
According to Key IV rotations, a rotated molar occupies:
more mesiodistal space
According to Key IV rotations, a rotated anterior tooth occupies:
less mesiodistal space
In the absence of genuine tooth size discrepancies “ideal” occlusions should have tight contacts:
Key V- Tight contacts
Key V- Tight contacts states that in the absence of genuine tooth size discrepancies:
“ideal” occlusions should have tight contacts
- A flat occlusal plane should be a treatment goal
- Intercuspation of teeth is best when the plane of occlusion is relatively flat
Key VI- Occlusal plane
Key VI- Occlusal plane states that a ____ should a treatment goal
flat occlusal plane
Key VI- Occlusal plane states that intercuspation of teeth is best when:
the plane of occlusion is relatively flat
Key VI- Occlusal plane states that the _______ of teeth is best when the plane of occlusion is relatively flat
intercuspation
