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Dahl principle

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    Figure 1. Patient A before treatment showing inter-canine collapse and crowding.
    Figure 2. Immediately after alignment and whitening.
    Figure 3. Six years with retention post-treatment.
    Figure 4. Patient B before treatment.
    Figure 5. Following alignment and increase of inter-canine width.
    Figure 6. Patient C in occlusion with deep bite. Note the posterior contacts.
    Figure 7. Patient in occlusion with Dahl composite added to lower anterior teeth. Note posteriors in contact at 3 months.
    Figure 8. Occlusal view before.
    Figure 9. Spacewize calculation shows 3.8mm crowding.
    Figure 10. Occlusal after eight weeks of alignment and commencement of bleaching.
    Figure 11. After 12 weeks with bleaching complete and additive bonding in place.
    Figure 12. Close side view before. Note differential wear.
    Figure 13. Close side view after alignment with Inman Aligner, bleaching and Dahl principle bonding.
    Figure 14. Close view before.
    Figure 15. Close view after.
    Figure 16. Patient protrusive, edge to edge before.
    Figure 17: After protrusive. Note how upper alignment has improved on its own by just aligning the lowers correctly.

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