Orthodontic Bone Anchors

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Orthodontic Bone Anchors

• Parameters for Success

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1. OBA history MK I MK II
2. Delayed versus immediate loading
3. Common indications
4. Conclusion
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tube
1999
2002
2000
2001
4
bracket
2000
2002
2001
5
- slot
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Publications on MK I
Mommaerts M, Correia P, Nuttens S. Experiencia
clinica com o Ortho Bone Anchor OBA
Relatorio Preliminar Rev Port Estomat Med Dent
Cir Maxilofac 42 131-135, 2001
Mommaerts MY, Michiels ML, De Pauw GA. A 2-year
outcome audit of a versatile orthodontic bone
anchor. J Orthod. 32 175-81, 2005
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Results of MK I study

• Placement between 2000 2002
• Follow-up till 2004
• 18 patients
• 35 OBAs

8,6 premature loss
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Conclusions of MK I study
Bayonet shaping of neck
Diminishing height of coronal screw head
Subtitle
Texturising of fixation part
Protection by fixed appliances
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1. OBA history
2. Delayed versus immediate loading with MK
II
3. Parameters for success
4. Conclusion
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Location
Removed OBAs 2002-2005
Distal to 2,3,4
Distal to 5,6,7
Piriform aperture
Zygomatic crest
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Delayed versus immediate loading
Removed OBAs
Always 5mm coronally
Mobile screws upon removal
Premature loss

Years in situ
5mm (30) 5 7mm (13) 4
1 2 mobinfl 1 lost mob
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Immediate mandible
Delayed mandible
5mm (46) 7 7mm (8) 0
0
20
30
Always coronal
Immediate maxilla
0
0
5
7
Delayed maxilla
5mm (11) 1 7mm (4) 0
0 3 mobinfl
19
35
No inflam response
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1. OBA history
2. Delayed versus immediate loading
3. Common indications
4. Conclusion
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Indications (all OBAs in situ gt 3 m)
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most common indication

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2 anchors for closing diastemas in 4 q!
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1. OBA history
2. Delayed versus immediate loading
3. Indications
4. Conclusion MK II study
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Coronal 5mm screws are vulnerable
2 important
No big difference between immediate delayed
loading in mandible
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Simple hook workhorse
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Brackets in special cases
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Better pull than push!

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Do not remove a mobile OBA too quickly!
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Incision not necessarily in fixed gums!
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Thank you!