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Invisalign European scientific symposium part 3: Expansion. Episode 12. May 25th 2020

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Hosted by
Farooq Ahmed

Summary of studies looking at expansion of aligners using invisalign First

Overall conclusions

· Greater expansion anteriorly

· Greater predictability of expansion anteriorly Vs posteriorly

· Greater predictability of expansion buccally, unpredictable palatally

Summary of webinar: Invisalign European scientific symposium part 3: Expansion

Arch expansion pattern using clear aligners: a three-dimensional retrospective study in paediatric subjects with posterior crossbite. Dr. Silvia Caruso

WHAT’S THE QUESTION?

  • How effective is the Invisalign system at expansion
  • Previous papers: not predicable but change in material to smart track since

WHO DID THEY TREAT?

  • N20
  • Age 6-10
  • Mod-severe crowding

WHAT DID THEY DO?

  • Retrospective
  • Maxillary dentition
  • Gingival width and buccal cusp width of teeth

WHAT DID THEY FIND?

Buccal expansion

  • C-C expansion:   very predicable: 99% achieved (4mm)
  • 1st permanent molar-molar expansion:  predicable  88% achieved (3.8mm)
  • Primary molar expansion:  least predicable buccal and palatal

Palatal expansion

  • Primary molar expansion:  unpredictable 42% achieved (1.9mm)
  • 1st permanent molar-molar   unpredictable 38% achieved (1.4mm)

CONCLUSION

  • Buccal expansion predictable with invisalign
  • Palatal expansion predictable at C-C region, unpredictable Molar regions

Summary of webinar: Invisalign European scientific symposium part 3: Expansion

First maxillary expansion with aligners in growing patients. Dr. Tommaso Castroflorio & Dr. Francesco Garino

WHAT WAS THE QUESTION?

  • What expansion can be achieved with Invisalign first

WHO DID THEY TREAT?

  • N = 43
  • Age 8
  • Morphological superimposition

WHAT DID THEY DO?

  • Expansion using Invisalign protocols

WHAT DID THEY FIND?

  • C-C expansion:   Greatest: 3mm +
  • Primary molar expansion:  3mm
  • Permanent molar-molar expansion:   Least: 2mm
  • 19% area increased
  • 38% volume increase

CONCLUSION?

  1. Expansion greater anterior, less posterior
  2. Increase in volume and area

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