Tips to Optimize Treatment Results Using Forsus Class II Corrector Dr. Lisa Alvetro
Advantages
· Independent of patient compliance
· Adaptable installation, AOB, deep bite, mandibular retrognathic, maxillary distalisation, maxillary anchorage
· Control upper and lower incisor inclination to maximise skeletal correction
Different components
· Spring: L pin, Easy module, headgear tube, wire mount
· Rod: Allows activation of spring
· Archwire
Forces generated
· Maxilla: Distal vector and intrusion (posteriorly)
o Occlusal plane control – intrusion = autorotation and class 2 correction
· Mandible: Mesial vector and intrusion (anteriorly)
o Intrusive vector aids deep bite correction
Spring
Horizontal vector
· Occlusal tube,
Vertical vector
· Gingival tube, Wire mount
Push rod
Horizontal
· Canine / omega loop
Vertical
· 1st or 2nd premolar
Cases
Deep bite case with reduced lower anterior face height
· Spring: Occlusal tube
o Reduce intrusion of upper molar
· Rod: Canine – 1st molar
o Canine = intrusion of lower incisors
· Archwire
o Lower TMA with bite opening curve, increase vertical changes to the lower arch
· Tip: Not engage U7s to allow eruption
High angle case
Prevent posterior vertical changes
· Spring
o Gingival tube
· Rod
o 1st premolar / 2nd premolar – 6 = greater intrusion vector upper posterior teeth (similar to high bul headgear)
o Rod less forward = less proclination, better lower incisor control
· Posterior intrusion
· Archwire
o Upper flexible archwire to enhance posterior intrusion
o Bond 2nd molar
o Lower SS to reduce lower incisor intrusion
o Consider lower bracket position gingival / bite closing sweeps
· Can transition from 1nd premolar to 2nd premolar in treatment, after AP correction, then focus on powerioer vertical intrusion
Forsus as anchorage
Extraction class 2 case Forsus with NiTi closing coils
NiTi closing coils upper and lower
· Upper force vector
o Forsus distal vector molar
o NiTi closing coil retract anterior teeth and protract molar
§ Net effect molar doesn’t move, anchorage preserved, anterior retraction
· Lower force vector
o Forsus mesial vector to anterior teeth
o NiTi closing coil: retract anterior teeth and protract molar
§ Net effect anterior teeth don’t move, anchorage preserved, posterior teeth protract
User manual for Forsus
https://multimedia.3m.com/mws/media/823065O/forsus-fatigue-resistant-device-treatment-guide.pdf
Youtube channel installation
