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?
- Expansion greater anterior, less posterior
- Increase in volume and area
