Seminar 1 Flashcards
What special investigations are used in ortho?
- Radiographs
- Study models
- Photos and facial profile aesthetics
- Cone Beam CT
- Sensibility tests
- Planning models
Why do we use alginates for study models?
- Baseline record
- Facilitate communication
- Facilitate assessment and diagnosis
What do you need to find out about MH?
- Is the patient fit and well
2. Any allergies eg nickel which is found in SS brackets and arch wire
Why is a history of Trauma important?
Increased risk of root resorption.
Follow up with a Trauma stamp
How do we assess A-P class?
- Visually assess Antero-Posterior class with FP parallel to the floor.
- Palpate skeletal bases
- Lateral Ceph
What is AP Class I?
when the maxilla is 2-3mm anterior to the mandible
How do we assess the vertical skeletal pattern?
By looking at the FMPA
What is a Low FMPA?
When it meets much further away than the back of the head
What should the LAFH be?
50: 50 clinically
55: 45 in a Ceph
What important facts about a pts DH is important for Ortho assessment?
- regular attender
2. previous treatment
How do we assess the Transverse Skeletal Pattern?
View from FRONT and ABOVE
What should the average Naso-Labial Angle be?
100deg
What is moderate crowding?
4-8mm
How do we measure the degree of crowding?
- Space available / space required
- Overlap technique
- Mixed dentition analysis
How much space does a lower canine need?
7mm
How much space does an upper canine need?
8mm
What teeth are approx. 7mm?
All the pre-molars and the lower canines
Key features of Class II div 1?
- Lower incisor edges lie posterior to the cingulum plateau of the upper central incisors
- Increased overjet
Key features of Class II div 2?
- Lower incisor edges lie posterior to the cingulum plateau of the upper central incisors
- Upper central incisors are retroclined
Key features of Class III?
- Lower incisor edges lie anterior to the cingulum plateau of the upper central incisors
- Overjet is reduced or reversed
In Class I canine relationship, where should the upper canine occlude?
Between the Lower canine and lower pre-molar
In Class I molar relationship, where should the upper 1st molar occlude?
Upper 1st molar MB cusp should occlude between the MB and DB cusp of lower 1st molar
What skeletal class would you use a function appliance?
Class 2 div 1
What are the types of supernumerary teeth?
Conical
tuberculate
supplemental
odontome
Where are ectopic canines usually found?
95% palatal
What is the most common reason for a central to not erupt?
tuberculate supernumerary
