Ortho One Flashcards
Extra oral features to look at (6)
1, face shape 2 symmetry 3. Smile line 4. Lip position 5. Face - convex, straight or concave 6. Mandibular plane - high, average or low
Extra oral features to note (3)
- Contra lateral eruption - within 6 months
- Tooth size
- Midline - floss is helpful
What is mandibular remodeling?
The distance between the mandibular first molar and the ramus that increases dramatically over time
What is more concerning, the pattern of eruption or time variations?
The pattern or sequence of eruption
What are the ages of primary teeth?
6 months to 6 years
What are the ages of mixed dentition?
6 years to 12 years
What teeth erupt during early mixed dentition?
6’s and incisors erupt
When is the late mixed dentition?
10-12 years
What teeth erupt during late mixed dentition?
Canines, premolars and second molars
Crowded primary teeth meant what for permanent teeth?
100% chance of crowded permanent adult teeth
What does aligned baby teeth mean for permanent teeth?
70% chance of crowding in permanent teeth
3-6mm of spacing in the deciduous teeth means what for permanent teeth?
20% chance of crowding in the permanent teeth
The transition from a flush terminal plane to a class one molar relationship is due to what?
A result of differential mandubular growth and/or leeway space
What dentition has a flush terminal plane?
The mixed dentition
When does the early mixed dentition occur?
6-8 years old
What is incisor liability?
The difference between the space needed for the permanent incisors and the space available
Size difference between the maxillary deciduous and permanent?
8.2mm
What is the space difference between the mandibular deciduous and permanent teeth?
5.6mm
Where does the space come from for aligning mildly crowded lower incisors? (3)
- Slight increase in arch width across canines
- Slight labial repositioning of the central and lateral incisors (wider arch)
- Distal shift of the permanent lower canines when the 74/84 exfoliate
How does the ugly ducking state present? (5)
- Flared laterals
- Midline diastema
- Lower incisor crowding
- Upper lateral may tilt distally due to the canines pressing on the distal aspect of their roots
- Space if the primary canines are lost
Age 6
Almost symmultanious eruption of 31/41, 36/46 and 16/26
Age 7 (3)
- Eruption of 11/21 and 32/42
- Root formation of 12/22
- 3,4 and 5’s in state of crown completion or just starting root formation
Age 8
Eruption of 12/22
- no other teeth erupting for 1-2years
Age 9/10 (4)
- No erupting teeth
- Middle mixed dentition
- Check for buccal canine bulges 13/23
- Resorption of deciduous canines and molars
Age 11 (2)
- Eruption of 33/43, 34/44 and 14/24
2. The late mixed dentition - 2nd transitional period
Age 12
Eruption of 13/23, 5’s and 7’s
Age 13/14
Permanent dentition stage
Age 15 (2)
- Crown formation of 8’s often complete
2. All permanent roots complete accept the 8’s
What is leeway space
The difference in width between the primary and permanent teeth
Max = 1.5mm
Man = 5mm
Three things palatable impacted canines are associated with are?
- Females
- Peg/small laterals
- Missing lateral teeth
What teeth help to create space when they erupt?
13/23
