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
