Class III Treatment
- Created by: Catherine Gough
- Created on: 13-03-17 13:09
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- Treatment of Class III
- Class III = lower incisor occluding in front of cingulum plateau of upper incisor
- Cause?
- - Maxillary retrusion(34%) - Mandibular protrusion (40%) - Both (26%)
- Prognosis depends on..
- - Skeletal pattern - Amount of overbite - Growth
- Upper incisor Proclinication
- Edge-to-Edge bite
- Minimal OB = relapse
- - Skeletal pattern - Amount of overbite - Growth
- Treatment Approaches
- Normal OB
- Mild Moderate Severe
- Avoid upper XLA if no lower crowding
- Fixed appliance, Loss of overbite, Poor prognosis (laterals can move back)
- Crossbite, No edge-to-edge, Surgery + Ortho
- Mild Moderate Severe
- Reduced OB
- Mild Moderate
- Accept incisors, Align teeth ONLY, Procline to reduce OB, XLA lower PMs, Bring lower anteriors back
- Poor prognosis, Accept incisors, Align ONLY / Surgery + Ortho
- Mild Moderate
- Normal OB
- Interceptive Treatment
- 1. Skeletal pattern (growth modification)
- - Mandible back - Maxilla forward - Both
- - Chin-cup - Face mask 20 hrs/day (4-6 months) - Twin block - Frankel 3
- PROBLEMS - Small activation - Maxillary retrusion - Continued growth
- - Mandible back - Maxilla forward - Both
- 2. Simple interception (move incisor over the bite)
- PROBLEMS - Class II skeletal - Enough OB - Primary canine Xbite - Space between canines - Lateral incisor resorption
- 1. Skeletal pattern (growth modification)
- No XLA in upper if no XLA in lower arch
- Removable Appliances?
- Class I / Mild Class III Skeletal + normal OB
- Can achieve edge-to-edge
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