12 Questions
What is the defining characteristic of Class II occlusion?
Upper teeth project more forward than lower teeth
What can cause Class II occlusion?
All of the above
What type of surgery may be required for adults with skeletal Class II malocclusion?
Orthognathic surgery combined with orthodontic treatment
What distinguishes Class III occlusion from Class II occlusion?
Lower jaw projects more forward in Class III
Why do some cases of Class II occlusion require orthognathic surgery?
To correct the position of the upper and lower jaw
How does finger sucking contribute to Class II problems?
Can exacerbate genetic predisposition to malocclusion
What is the prominent feature in patients with Class III malocclusion?
Prominent chin
Which jaw is usually associated with excessive growth in Class III malocclusion?
Lower jaw
What is the indicated treatment for skeletal Class III malocclusion?
Orthodontics combined with orthognathic surgery
Which type of elastics are typically used for full dentition Class III correction to align the upper and lower arches in rectangular wires?
Bear
What can cause an open bite?
Tongue thrust
What should be done in case of a patient with an open bite 'bad enough'?
Bond tongue tamers
Study Notes
Malocclusion Types and Corrections
- Class III malocclusion: characterized by a concave profile with a prominent chin, often due to excessive growth in the lower jaw or lack of upper jaw growth.
- Class III correction: requires orthodontics combined with orthognathic surgery.
Class III Elastics
- Used for CL3 correction and to help squeeze bite in posterior.
- Elastics:
- Penguin (.014 or .018 wires)
- Seal (.018 or 20x20 wires)
- Bears (rectangular CN wires or TMA)
- Ram (TMA or SS wires)
- Shorty CL3 elastics can be used in light wires or for someone who is detorqued in anterior.
- U6/L3 Elastics used:
- Penguin
- Seal
- Bears
- Ram
- Shorty CL3 elastics
- U6/L4 Elastics used:
- Rabbit (.014, .018, 20x20 wires)
- Kangaroo (rectangular CN or TMA wires)
- Impala (TMA or SS wires)
Open Bite Correction
- Caused by tongue thrust or tongue resting on anterior teeth.
- Elastics used:
- Rainbow-U1’s/L3’s with monkey
- May require bonding tongue tamers if severe.
Midline Elastics
- Used to align the center of the upper and lower arches.
- Teeth to hook elastic up to will depend on how the bite needs to be adjusted.
- Size elastic will depend on the teeth hooked up.
Class II Occlusion
- Characterized by a convex profile with a retracted chin and lower lip.
- Caused by insufficient growth of the lower jaw, excessive growth of the upper jaw, or a combination of both.
- May be inherited genetically and aggravated by environmental factors like finger sucking.
Class II Correction
- Requires orthodontic treatment combined with orthognathic surgery.
- Elastics used:
- Penguin (.014 or .018 wires)
- Seal (.018 or 20x20 wires)
- Bears (rectangular CN wires or TMA)
- Ram (TMA or SS wires)
- Shorty CL2 elastics can be used in light wires or for someone who is detorqued in anterior.
- U3/L6 Elastics used:
- Penguin
- Seal
- Bears
- Ram
- Shorty CL2 elastics
- U4/L6 Elastics used:
- Rabbit (.014, .018, 20x20 wires)
- Kangaroo (rectangular CN or TMA wires)
- Impala (TMA or SS wires)
Explore the characteristics and causes of Class II occlusion in dentistry, where the upper teeth protrude more forward than the lower teeth. Understand how insufficient growth of the lower jaw, excessive growth of the upper jaw, or a mix of both can lead to this malocclusion.
Make Your Own Quizzes and Flashcards
Convert your notes into interactive study material.
Get started for free
