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