6 Keys to Normal Occlusion Flashcards
List the 6 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 mandibular 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 too? 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 Key 1- molar relation, the mesiolingual 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)
mesiolingual cusp of maxillary first molar; central fossa of mandibular first molar
In this image, what are the arrows pointing too? What does this satisfy?
mesiolingual cusp of 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 ___ & ___ enjoy a cusp-embrasure relationship bucally & cusp-fossa relationship lingually
canine & premolar
According to Key 1-molar relation, if the maxillary and mandibular molars are in normal relation, the canine & premolar enjoy a ______relationship bucally & _____ relationship lingually
cusp-embrasure; cusp-fossa
In this image, what is the first arrow pointing too? What does this satisfy?
canine & premolar enjoy a cusp-embrasure relationship buccal
Key 1- molar relation
The gingival portion of the long axis of each tooth is distal to the incisal portion:
Key 2- Crown angulation
According to Key 2- crown angulation:
The gingival portion of the long axis of each tooth is distal to the incisal portion
What is this image showing?
Key 2- crown angulation -The gingival portion of the long axis of each tooth is distal to the incisal portion
What is this image showing?
Key 2- crown angulation -The gingival portion of the long axis of each tooth is distal to the incisal portion
The degree of tip of the incisors determines the amount of mesiodistal space they consume:
Key 2- crown angulation
Key 2- crown angulation states that the degree of tip of the incisors determines the amount of:
mesiodistal space they consume
Key 2- crown angulation states that the ____ determines the amount of mesiodistal space they consume
The degree of tip of the incisors
(Crown angulation)
+ reading = ____ tip of the crown
- reading = _____ tip of the crown
+ = distal tip
- = mesial tip
Key 3 =
crown inclination
Would the crown inclination in the following image 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 3- 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?
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 4 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 abscence of genuine tooth size discrepancies, “ideal” occlusions should have tight contacts:
Key V- Tight contacts
Key V- Tight contacts states that in the abscence 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 be 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
