Ortho ABGD Mock Oral Exam Flashcards
What will a mesial step become?
- 15% class 3 (if excessive) but can become class 1
What will flush terminal plane become?
- 75% a good starting point
- Class 1 if all else if normal
- Other factors could cause class 2 or 3
What does a distal step become?
- 10% almost always class 2 or end to end
What does primate space help with?
Where are they?
- Helps to compensate for incisor liability
- Max: mesial to the canine
- Man: distal to the canine
What is incisor liability?
What amount of space is available in the max and man arches?
- Permanent incisors are broader than primary incisors and a space discrepancy called incisor liability exists
- Maxilla: just enough space exists
- Mandible: 1.6 mm less space, normal to have some slight crowding until arch develops
What is incisor liability compensated for by?
- Intercanine distance: increases between ages 6-12, 1-3 mm in mandible, a little more in maxilla
- No increase seen after incisors are erupted
- Anterior teeth erupt more labial than the primary anteriors creating a broader arch and thus providing up to 2 mm of space
- Mandibular canine moves distal into primate space
What is the eruption sequence of pirmary teeth?
- ABDCE
- Girls before boys
How do you correct an anterior crossbite?
- Appliance therapy
- Removable: finger on maxilla or labial bow on mandible
- Will move the teeth 1 mm a month
What are some considerations when analyzing an anterior crossbite?
- Is there enough room available?
- Is the problem skeletal or dental?
- Can the patient tolerate an impression?
- Posterior biteplate to reduce the overbite if treatment goes beyond 2 months
What are some factors to consider when deciding to do molar up-righting?
- Third molar presence
- Distally inclined premolars
- Edentulous space management
- Occlusal reduction upon extrusion
- Periodontal condition (crown/root ratio)
- Tooth structure remaining
- Crown (ability to obne a bracket)
What might be some complicating factors in molar up-righting?
- High mandibular plane angle
- Open bite
- Periodontal disease
- Poor crown to rot ratio and/or short roots
- Presence of root resorption
- Temporary Anchorage Device (TAD) provides absolute anchorage
What do you know about clear aligner therapy?
- Series of trays and attachments cemented on teeth
- There is a template alginer which helps you position them correctly
- The attachments are necessary for extrusive and rotational forces
- Patients must wear the aligners a minimum of 22 hours per day
- Aligners fit tightly and patients may struggle placing and removing (without fingernails)
What is the name of the computer program that treatment plans clear aligner therapy?
Clincheck
Describe the movements of clear aligner therapy?
- Movements are 0.25 per aligner - 0.1 mm for finishing
- May involve IPR
What are some indications for clear aligner therapy?
- Appropriate for Class 1
- Mild (1-5 mm) max/man crowding
- Adult who had previous ortho and stopped wearing their retainer
- Esthetic (adults), could potentially bleach in conjunction with ortho
What is this?
Thermoforming pliers for fabricating clear aligners
