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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
2000
1999
2001
2002
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+ bracket
2000
2001
2002
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- 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 OBA’s
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
Mandible:
31
Piriform aperture
Maxilla:
13
Distal to 5,6,7
4
Zygomatic crest
11
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Delayed versus immediate loading
Removed OBAs
Years in
situ
Always 5mm coronally
#
Premature
loss
Mobile screws upon removal
5mm (30): 5
7mm (13): 4
5mm (46): 7
7mm (8): 0
Immediate
mandible
23
15
1
2 mob+infl
1 lost mob
Delayed
mandible
30
20
0
Always coronal
Immediate
maxilla
7
5
0
0
Delayed
maxilla
35
19
0
3 mob+infl
5mm (11): 1
7mm (4): 0
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 > 3 m)
1 5
mandible
4
3
4
maxilla
8
ec
om
pe
tr
co
v
n
a
en
er
sa
m
ct
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i
es
ti
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i
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a
is
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l
3
35
11
ag
ex
d
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0
10
20
30
40
50
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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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2 important
Coronal 5mm screws are vulnerable
No big difference between
immediate & delayed loading in
mandible
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Simple hook = workhorse
March 2003
October 2005
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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!
April 2002
October 2003
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Incision not necessarily in fixed gums!
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Thank you!