part ii-management of class ii malocclusion with speed appliance part ii
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Management of Class II Malocclusion with SPEED
AppliancePart II
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©Dr Sylvain Chamberland
Clinical Case presentation
• Class II div 1 and II
• Twin Force Bite Corretor
• Pendulum appliance and intrusive arch to level the curve of spee
• Biomechanical approach for cl II div 2 (mx anterior intrusive arch)
• TAD and extraction approach in hyperdivergent cases
Stacey (14 y 10 m)
©Dr Sylvain Chamberland
• Class I profile
• Retroclined 1/
©Dr Sylvain Chamberland
Cl II div 2
• Maxillary constriction
• Left posterior Xbite
• Severe 1st molar mesial rotation
St.De 010210, 14y 10 m
©Dr Sylvain Chamberland
Tx plan
• RPE + exo 2 premolars?
• RPE, non exo + cl II correctors?
• RPE, non exo, molar derotation, mx anterior intrusive arch
©Dr Sylvain Chamberland
•At 34 weeks!TFBC are installed
•At 52 weeks!TFBC removed
!A Hilgers RPE design would have achieved derotation of the 1st molar while an Hyrax had maintained it.
St.De 100111 Md:.020 x.020 SS
Mx:.018 SC™
St.De 140211 Md:.020 x.020 SS
Mx:.016 X .016 Sent
©Dr Sylvain Chamberland
At 58 weeks
• Mx molar de-rotation is needed
• Class II elastic to wear during night
• Coordination of arch form is necessary
St.De 280311
©Dr Sylvain Chamberland
• Mx molars distalized
• /1-MP proclined by 17°
• Rotation of occlusal plane noted
©Dr Sylvain Chamberland
At 80 weeks
• Finishing bends here and there
• Incisal recontouring
St.De 280311
Roxane (11 y)
©Dr Sylvain Chamberland
• Class II div 1
• Constricted maxilla
Ro.Lé 061009
©Dr Sylvain Chamberland
• Skeletal class II
• Proclined lower incisors
• Lip trapping
• Low MPA
©Dr Sylvain Chamberland
• Fixed class II correctors (Forsus, Twin force, Herbst, etc) have a tendency to procline the lower incisors
• Therefore, maxillary molar distallization was preferred for class II correction in this case
©Dr Sylvain Chamberland
At 22 weeks
• Class I molar relationship obtained
• Elastomeric chain to distalize the U5'S
• 17x25 niti intrusive arch attached at the canine to level the lower arch and minimize /1 proclination
Ro.Lé 060410 Md:.016 x.022 neost + 17x25 niti
Mx:.018 SC™
©Dr Sylvain Chamberland
At 45 weeks
• Sliding mechanics on a .016 SS, cinch back
! Elastomeric chain attached to U4’s
• Class I canine relationship is obtained
Ro.Lé 160910 Md:.020 x.025 Niti
Mx:.016 SS, cinch back
©Dr Sylvain Chamberland
At 60 weeks
• Bond 7's/
! EC 12 to 22
! Anteriors will be retracted with .017 x .025 mushroom loop
• /7's will be bonded at next RV
Mx:.016 x .016 sent
Ro.Lé 281010
©Dr Sylvain Chamberland
At 67 weeks
• Mx: Elastomeric chain 6 to 6 to maintain space closure
• .020 x .025 niti for leveling prior finishing
• .020 x .025 SS for finishing " 17 weeks
Ro.Lé 170211
Mx:.020 x .025 Nitisw
Md:.020 x .025 Nitisw
©Dr Sylvain Chamberland
At 97 weeks
Ro.Lé 140711
©Dr Sylvain Chamberland
6 weeks into retention
Ro.Lé 250811
©Dr Sylvain Chamberland
©Dr Sylvain Chamberland
Emmanuel (14 y)
©Dr Sylvain Chamberland
• Cl II div 2
• Deep overbite
• Mx molar mesially rotated
Em.Be 250610
©Dr Sylvain Chamberland
• Dished in profile
• Retroclined 1/-SN & /1-MP
• Increased 1/1 " 147°
©Dr Sylvain Chamberland
Tx objective
• Decreased interincisal angle
• Procline 1/ and /1
• Obtain class I molar and canine relationship
©Dr Sylvain Chamberland
Tx Plan
• Forsus?
• RPE?
• Exo of 2 mx premolars?
©Dr Sylvain Chamberland
• Mx 3 segments (016 x 022 niti) for alignment
• Overlay 17x25 niti intrusive arch
! Anterior intrusion
! Posterior extrusion
! Tip back at buccal segment
Em.Be 060710
• TPA .032 SS activated to de-rotate the molars
• Molars distalization
©Dr Sylvain Chamberland
Why the intrusive arch is overlayed and not engaged into the brackets of the incisors?
• The rectangular wire would create a torquing moment
• This would be balanced by anterior extrusion and posterior intrusion
• That would substract from the anterior intrusive force and posterior extrusive force
• The efficacy of the force sytem would be reduced
• Also the intrusive force would be in-line or lingual to the center of resistance of the incisor negating the desired flairing effect
©Dr Sylvain Chamberland
Do we need to understand orthodontic mechanics
• Yes, because I said so
• Yes, because...
«...when a case is challenging,orthodontists know what to do.»
©Dr Sylvain Chamberland
At 6 weeks
• Anterior mandibular teeth are bonded
• Unraveling the lower curve of Spee will assist cl II correction
Em.Be 190810 Md:.016 SC™
©Dr Sylvain Chamberland
At 13 weeks
• Mx: 16 SC™ engaging the canines
• Derotation of mx molars noted
Em.Be 051010
Mx:.016 SC™
Md:.016 Sent
©Dr Sylvain Chamberland
At 20 weeks
• Md: 016 x 022 neosent
• Mx: 016 sent + cl II elastics
• Intrusive arch is removed
Em.Be 221110 Md:.016 x .022 neosent
Mx:.016 Sent
©Dr Sylvain Chamberland
At 27 weeks
• Remove the TPA
• Continue cl II eastics
• Class I relationship is almost achieved
Em.Be 100111 Md:.020 x .020 neosent
Mx: 016 x .022 neosent
©Dr Sylvain Chamberland
At 40 weeks
• Reassessment of bk position
! Rebond 12, bond 16, 26, 47
• Continue cl II elastics
Em.Be 120411
Mx: .020 x .020 neosent
Md:.020 x .020 neosent
©Dr Sylvain Chamberland
Em.Be 220811
At 59 weeks
• Mx: ! elastomeric chain
• Md: rebond #47 , #33, .020 x .020 neost
Rebonded
©Dr Sylvain Chamberland
• May be some improvement in lip support can be noted
• Incisors display is adequate
©Dr Sylvain Chamberland
• Is such a treatment approach repeatable?
! Same mechanics: 28 weeks into treatment
Wi.Ja. 270111
Wi.Ja. 260811
3 Segments 16 x16 sent" 16x22 neo"16SC + cl II"16sent + cl II"16x22 neost + cl II
2 Segments 16sent"16sent continuous "20 x 20 neost + cl II"20x25 niti + cl II
©Dr Sylvain Chamberland
Eloïse (9 y 7 m)
©Dr Sylvain Chamberland
• Cl II div 1
• Mx crowding
El.Re 060510
©Dr Sylvain Chamberland
• Slight vertical facial asymmetry
• Retrognathic mandible
• Low FMA, brachycephalic
El.Re 060510, 9 y 7 m
©Dr Sylvain Chamberland
• At 29 weeks
! Forsus are engaged
! Md: .020 x .025 SW, loop distal to the canine, cinch back
El.Re 310111
• At 35 weeks
! E-links to sliding the canine distally on .020 x .025 SW
El.Re 201210 Md:.020 x .025 sw
Mx:.020 x .025 swCinch Cinch
©Dr Sylvain Chamberland
At 41 weeks
• Reassessment of bk position
! Rebond 12, 16, 26,
! Bond 37, 46, rebond 33, 35, 45
©Dr Sylvain Chamberland
At 41 weeks
• Forsus and Hyrax removed
• Canines distalized and a space opened mesially
• Side effect: posterior intrusion
El.Re. 140311 Md:.016 sent
Md:.016 x .022 neosent
©Dr Sylvain Chamberland
• Molar distallization and intrusion
• Increased smile display
• /1-PM was maintained at 109°
El.Re 140311
©Dr Sylvain Chamberland
At 64 weeks
• Mx & Md: .020 SS SW
• Finishing bends, Cl II elastics
El.Re. 220811
©Dr Sylvain Chamberland
El.Re. 220811
Maude (16 y 7 m)
©Dr Sylvain Chamberland
• Cl II div 2
• Moderate ALD
Ma.Ma 310809, 16y 7 m
©Dr Sylvain Chamberland
• Straight profile
• Lips to E-plane = normal
• Retroclined 1/
• Proclined /1
•Tx Plan#Non extraction?#Extraction?
©Dr Sylvain Chamberland
At 61 weeks• Mx: 21x21x20 x 38 mm, E-links #5 at 17 & 27
• Md: 21x21x20 x 38 mm
! To include the canine in the rectangular section
! Upright spring on 1st premolars, E-links #3
! Cl II elastics 3/6
Ma.Ma 221110
©Dr Sylvain Chamberland
At 74 weeks
• Space closure is effective
• Lower curve of Spee remained flat
• Continue cl II elastics
Ma.Ma 240211
©Dr Sylvain Chamberland
At 81 weeks
• Mx: Continue en masse retraction
• Md: .020 x .025 SW + EC 6 to 6
! Continue cl II elastics
Md:.020 x .025 swMa.Ma 130411
©Dr Sylvain Chamberland
At 102 weeks
• Finishing bend
• Enamel recontouring
Ma.Ma 080911 Md:.020 x .025 sw
Mx:.020 x .025 sw
©Dr Sylvain Chamberland
Marie-Anne (10 y 9 m)
©Dr Sylvain Chamberland
• Cl II div 1
• Md deviated to the right
• Deep overbite
• Mesially rotated 1st molar
Ma.Co 250809, 10y 9 m
©Dr Sylvain Chamberland
• Proclined 1/ and /1 (1/-SN = 121°; /1-MP = 104°)
• Large overjet, 1/1 = 108°
• Deep overbite
©Dr Sylvain Chamberland
Tx plan
• Any cl II fixed corrector will procline lower incisors
• Lower incisor intrusion with a SW will procline /1
©Dr Sylvain Chamberland
At 11 weeks
• .032 TMA TPA to derotate U6’s
• Md: 3 segments + lingual arch
• Intrusive arch 17x25 niti attached at /3’s (distal to C rot) to intrude and retrocline /1
Ma.Co 011209
©Dr Sylvain Chamberland
At 23 weeks
• Md: 20x20 neost + intrusive arch on /3’s
• Mx: 20x25 nitisw (to detorque U1’s)
• Cl II elastics
• Molars are derotated
Ma.Co 230210
©Dr Sylvain Chamberland
At 29 weeks
• Mx: 21x21x20 to slide buccal segment distally
• TPA removed
• Md: 20x25 nitisw, LA + intrusive arch removed
• Unilateral FORSUS cl II corrector on the right side is installed
Ma.Co 070410
©Dr Sylvain Chamberland
• 1/ SN = 102, retracted to normal
• /1-MP = 105 maintained
• 1/1 = 125 = normal
©Dr Sylvain Chamberland
At 53 weeks
• Remove Forsus on the right side
• Mx: 17x25 TMA mushroom loop to retract anteriors (note the space mesial to U3’s)
• Md: 20x25 nitisw
• Class I molar and canine relationship achieved
Ma.Co 200910
©Dr Sylvain Chamberland
At 59 weeks
• Mx: 20x25nitisw + elastomeric chain
• Continue cl II
Ma.Co 011110
©Dr Sylvain Chamberland
At 78 weeks
• Mx: 20x25 sw + elastomeric chain
• Md: 20x25 nitisw
• Patient instructed to wear Cl II elastic during nightime
Ma.Co 210311
©Dr Sylvain Chamberland
At 103 weeks
• Class I molar and canine relationship
Ma.Co 070911
©Dr Sylvain Chamberland
©Dr Sylvain Chamberland
Estelle (28 y 4 m)
©Dr Sylvain Chamberland
• Class I, congenitally missing #45
• Xbite 22/33
Es.Gr 040609
©Dr Sylvain Chamberland
• Bimax protrusion
• Mx midline to the left
• Tx plan
! Exo???
©Dr Sylvain Chamberland
• Tx initiated with .016 SC™ for 12 weeks, then .018 SC™ for 8 weeks
• At 20 weeks:
! Mx: 18 SC; Md: .016 sent
• Followed by .016 x .022 neost, .020 x .020 neost, .020 x .025 niti, then .021 x .021 x .020 en masse retraction
Es.Gr 231109, 20 weeks Md:.016 Sent
Md:.018 SC™
©Dr Sylvain Chamberland
• Sliding #13 on the round section of HDGW
• Note the slight curve of Spee in lower arch
! The squared anterior section is limited to lower incisors
! This reduce the stiffness of the anterior segment
! The canine and the 1st premolar have a tendency to tip lingually as the E-links press on the labial surface
! When spaces are closed, it is most often not possible to engage a .020 x .025 SS wire
Es.Gr 071210, 74 weeks #45 was protracted alone before engaging #46
©Dr Sylvain Chamberland
• Md: .021x.021x.020 x 58 mm
! Extended square anterior section include the 1st premolars
! This increased the wire stiffness in torsion
! Hence it help to maintain a flat curve of Spee
! Once the space are close, a .020 x .025 SS sw can be engage
• Mx: #13 distalized into cl I
Es.Gr 180111, 80 weeks
©Dr Sylvain Chamberland
• Mx cl I canine is achieved
! EC 7-6-5-3-o-2
! 6 weeks later (92w), the EC was changed and an active coil was added
Es.Gr 010311, 86 weeks
Md: .020 SS
Es.Gr 240511, 98 weeks Md: .020 x.025 nitisw
• 98 weeks: midline improved
! Sliding mechanics: Light force + round wire
©Dr Sylvain Chamberland
At 110 weeks
• Mx: rebond #22 to move the root mesially
! .020 x.025 nitisw + EC
• Md: .020 x .025 SSsw + EC
Es.Gr 150811, 110 weeks
A.G.Class II div 1 OB
©Dr Sylvain Chamberland
• Cl II div 1
• Open bite
• Moderatle ALD
An.Gr. 160309, 14 y 4 m
©Dr Sylvain Chamberland
• Hyperdivergent
• Bimaxillary protrusion
• Lip incompetency
©Dr Sylvain Chamberland
Tx planTx initiated: July 15-2009
• Extraction?
• Surgery?
• Non-surgery
• TADs
©Dr Sylvain Chamberland
At 13 weeks
• Mx:
! TADs 6 x 1,4 mm
! 3 segments .020 x.020 neost + TPA .032 x .032 activated mesial out
• Md: .018SC™
An.Gr. 131009
©Dr Sylvain Chamberland
At 21 weeks
An.Gr. 131009
• Mx: Replace TAD distal to 1st m, .016 sent
• Md: TADs 8 x 1,4 mm + .016 sent
An.Gr. 071209
©Dr Sylvain Chamberland
At 26 weeks
• Mx: .016 x .022 neost, ! EC
• Md: .016 x .022 neost, ! EC
! .032 TMA LA
An.Gr. 071209
An.Gr. 15-01-10
©Dr Sylvain Chamberland
At 34 weeks
• Mx: .21 x .021 x .020 x 38 mm -E5 7-3
• Md: .020 x .025 niti
An.Gr. 15-01-10
An.Gr. 08-03-10Class 1I
©Dr Sylvain Chamberland
At 46 weeks
• Mx: .E links: Hook to the TADs
• Md: ! E4
• TPA and LA removed
An.Gr. 08-03-10
An.Gr. 07-06-10 Md: .021 x .021 x .020
Class 1
©Dr Sylvain Chamberland
Md: .020 x .025 niti + ECAn.Gr. 02-09-10
At 59 weeks
• Mx: E links: Shep-Hk to the TAD
! EC 11-27
• Md: .020 x .025 niti
An.Gr. 15-07-10 Md: .021 x .021 x .020
©Dr Sylvain Chamberland
At 66 weeks
An. Gr. 191010
! Mx: .021 x .021 x .020. Lig. tie TAD-U3, E links
! Mx: EC 6 to 6
! Md: .020 x .025 SW
An. Gr. 231210 Md: .020 x .025 SS
At 75 weeks
©Dr Sylvain Chamberland
At 94 weeks
• After 2 missed rendez-vous: lost 12 weeks!
• Patients involved in a fight!!!
! Luxation of 12, 11, 42, 41, 31
An. Gr. 020511 Md: .020 x .025 SS
Mx: .021 x .021 x .020 SS
Mx: .016 x .022 neost
Md: .06 sent
©Dr Sylvain Chamberland
• Significant facial changes
• Lip competency improved
©Dr Sylvain Chamberland
• Condilar growth
• Almost no aveolar growth
• Finishing stages to improveroot parallelism
©Dr Sylvain Chamberland
At 111 weeks
• TAD are removed
• Wire cut distal to lower 5’s
• Debond in 2 weeks
An. Gr. 290811
Ma.An. Vo. Bo.
©Dr Sylvain Chamberland
• Cl II div 1 open bite
Ma.An.Vo.Bo 260109, 16 y 4 m
©Dr Sylvain Chamberland
• Lip incompetency
• Bimaxillary protrusion
• Vertical maxillary excess (posterior)
©Dr Sylvain Chamberland
Tx Plan
• Extraction
• Would usually involve bimaxillary surgery
! The patient was tx planned for surgery.
! Tx initiated: March 5, 2009
©Dr Sylvain Chamberland
52 weeks into treatment• The patient and his father declined the surgery: No way!
Ma.An.Vo.Bo 030310 Md: .021 x .021 x .020 E-4
Md: .020 x .025 sw
• Pull out the TAD box!• TAD: 8 x 1,8 mm
©Dr Sylvain Chamberland
• Mx arch was treated in segments
©Dr Sylvain Chamberland
At 67 weeks
• Upper left TAD is replaced
• Lower expansion occurred because of the absence absence of a lingual arch
Ma.An.Vo.Bo 150610
©Dr Sylvain Chamberland
At 110 weeks
• Upper left TAD failed 3 times
• TFBC was used unilaterally on the left from Dec. 2010 to April 2011
Ma.An.Vo.Bo 190411
©Dr Sylvain Chamberland
At 128 weeks
• A compromised posterior occlusion was accepted
• Mandibular asymetry to the left may explain the cl II relationship
Ma.An.Vo.Bo 110811
©Dr Sylvain Chamberland
• Smile display improved
• Lip competency improved
• Mandibular déviation to the left is noted
©Dr Sylvain Chamberland
• Right condyle larger than left condyle
©Dr Sylvain Chamberland
• Forward rotation of the mandible
! Intrusion of mx molars
! Intrusion of md molars
! AFH !
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