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24 Cards in this Set
- Front
- Back
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Orthdontics
At what point can an unerupted Mesio-angularly tilted upper canine no longer be treated orthodontically? |
When the cusp tip is mesial to the canal of the central incisor radiographically
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Orthodontics
In what % of the population are upper and lower centerlines not co-incident? |
70%
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Cephlametrics
Where is Point 'S' located? |
Middle of the stella turscia
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Extra-Oral Ortho Assessment
What 4 points do we use to judge facial heights? |
Hairline
Glabella Base of Nose Chin |
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Cephlametrics
Where is Point 'N' located? |
Nasion (Naso-frontal symphysis)
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Cephlametrics
Where is Point 'A' located? |
Point of greatest concavity of the maxilla
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Cephlametrics
Where is Point 'B' located? |
Mandibular concavity
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Cephalometrics
At what age does the cranial base become fixed? |
Age 7
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Intra-Oral Occlusal Assessment
Which teeth form the anterior segment? |
Incisors only
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Radiographic Assessment
Is a DPT required as part of an orthodontic assessment? |
No - only if it progresses to treatment
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Orthodontic Assessment
Why is a DPT required prior to treatment? |
To give indication of root lengths
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Cephalmetrics
Where is Point 'Go' (Gonion) located? |
At the angle of the mandible, calculated by bisecting the tangents of the adjacent bone
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Cephalometrics
Where is Point 'Or' (Orbitale) located? |
Inferior border of the Orbit [Left]
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Cephalometrics
Where is Point 'ANS' located? |
Anterior Nasal Spine
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Cephalometrics
Where is Point 'PNS' located? |
Posterior Nasal Spine
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Cephalometrics
What two points are used to construct the maxillary plane? |
PNS -> ANS
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Cephalometrics
Where is Point 'Me' located? |
Menton (Anto-Inferior border of mandible)
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Cephalometrics
What is 'Rickett's E-Plane'? |
The line from chin to tip of nose
(soft tissue) |
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Where should the lips be in relation to Rickett's E-Plane?
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Upper = marginally posterior
Lower = 2mm anterior (±2mm) |
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IOTN Classification
DHC Grade 1 Criteria |
Extremely minor malocclusions, including displacements less than 1 mm
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IOTN Classification
DHC Grade 2 Criteria (7) |
Increased Overjet > 3.5 mm but <= 6 mm (with competent lips)
Reverse overjet greater than 0 mm but <= 1mm Anterior or posterior crossbite with <= 1mm discrepancy between retruded contact position and intercuspal position Displacement of teeth > 1mm but <= 2mm Anterior or posterior open bite > 1mm but <= 2mm Increased overbite >= 3.5mm (without gingival contact) Pre normal or post normal occlusions with no other anomalies. Includes up to half a unit discrepancy |
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IOTN Classification
DHC Grade 3 Criteria (6) |
Increased overjet > 3.5 mm but <= 6 mm (incompetent lips)
Reverse overjet greater than 1 mm but <= 3.5mm Anterior or posterior crossbites with >1mm but <= 2mm discrepancy between the retruded contact position and intercuspal position Displacement of teeth >2mm but <=4mm Lateral or anterior open bite > 2mm but <= 4mm Increased and incomplete overbite without gingival or palatal trauma |
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IOTN Classification
DHC Grade 4 Criteria (11) |
Increased overjet > 6mm but <= 9 mm
Reverse overjet > 3.5 mm with no masticatory or speech difficulties Anterior or posterior crossbites with > 2 mm discrepancy between the retruded contact position and intercuspal position Displacements of teeth > 4 mm Lateral or anterior open bites > 4 mm Deep and complete traumatic overbite Hypodontia requiring orthodontic treatment Posterior lingual crossbite with no functional occlusal contact in one or more buccal segments Reverse overjet > 1 mm but < 3.5 mm with masticatory and speech difficulties Partially erupted teeth, tipped and impacted against adjacent teeth Supernumerary teeth |
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IOTN Classification
DHC Grade 5 Criteria (6) |
Increased overjet > 9 mm
Extensive hypodontia with restorative implications (more than one tooth missing in any quadrant requiring pre-restorative orthodontics) Impeded eruption of teeth (apart from 3rd molars) due to crowding, displacement, the presence of supernumerary teeth, retained deciduous teeth, and any pathological cause Reverse overjet > 3.5 mm with reported masticatory and speech difficulties Defects of cleft lip and palate Submerged deciduous teeth |
