Occlusion and Malocclusion - Class I Malocclusions
6 important questions on Occlusion and Malocclusion - Class I Malocclusions
Skeletal features of Class I malocclusion?
- Usually skeletal Class I
- May be mild Class II or Class III with dentoalveolar compensation
- Vertical and transverse anomalies may be found e.g. AOB, crossbites
Dental features of Class I malocclusion?
- Most common problem is crowding, usually due to local factors
- Spacing
- Bimaxillary proclination
- Vertical anomalies, e.g. AOB
- Transverse anomalies, e.g. Crossbites, scissorbites
Facial growth in Class I malocclusions?
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Principles of managing a crossbite. (ref)
Gill et al., 2004 (Dental Update)
Treatment options for crossbite? (refs)
- URA with midline screw/coffin spring
- Quadhelix
- RME
- AW expansion in fixed appliances
- Expansion arch (attached in molar tubes)
- Surgical assisted expansion
Agostino et al., 2014 (Cochrane)
McNally et al., 2005 (RCT Quad vs Expansion Arch)
What is a lingual crossbite (scissorbite)? Management principle?
Needs mandibular expansion and maxillary contraction
If severe may need surgery
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