Week 7 Mani- Self correcting anomalies Flashcards
What are self correcting anomalies found in pre-dental period?
- Infantile swallowing
- Retrognathic md
- Anterior open bite
How does pts mandible often appear from birth to eruption of 1st deciduous teeth?
Retrognathic mandible
- Md lateral sulcus lies posterior to mx lateral sulcus
- Upper gum pad protrudes
What are causes of retrognathic mandible prior to eruption of teeth?
- Growth magnitude and duration greater for anterior maxilla than anterior md
- Upper anterior gum pad (intercuspid width) > lower anterior gum pad
- Mandibular undergoes largest amount of growth post-natally rather than prenatally.
How is retrognathic md prior to eruption of teeth self corrected?
Within 6-7 months by downward and forward growth of md
What are self correcting anomalies in primary dentition?
- Anterior deep bite
- Spacing
- Flush terminal plane
- Edge to edge bite
What are self correcting anomalies in mixed dentition?
- Anterior deep bite
- Md anterior crowding
- Ugly duckling stage
- End on relationship
Why is anterior deep bite present in primary dentition?
- Incisors are more upright (more vertical inclination- interincisal angle around 150°)
- Infra-occlusion of partially erupted molars
EXAM NOTE
pic may be given and we could be asked what tx is required → may just be observation
When do you correct anterior deep bite?
Wait until both upper and lower incisors have erupted completely. Approx 10 years.
Why is midline diastema present in ugly duckling stage?
Permanent canine force exerts pressure on lateral incisor which then exerts pressure on central, leading to midline diastema
9-10 year old- large front teeth, midline diastema. How to treat?
Ugly duckling stage. No need for ortho treatment. Condition will correct by itself.
3 types of spacing
- Physiologic (generalised spacing- less likely to get crowding)
- Leeway (contributes to future class I molar relationship in permanent dentition)
- Primate
Can retrognathic md during pre dental period be used as a reliable diagnostic criteria for predicting subsequent arch relationship?
No. But if A-P dimension of gum pads is greater, the possibility of child developing malocclusion is greater
What does anterior open bite and retrognathic md help with in pre dentate children?
Helps in suckling
How does anterior open bite in pre-dental child present?
Upper and lower gums pads are approximated
- Contacts only at molar region
- Space exist in anterior region
How is anterior open bite in pre dental child self corrected?
At 6-7 months by eruption of primary incisors