Das Wirkungsspektrum des Positioners
Beschreibung
vor 19 Jahren
Aim: The aim of this retrospective cast study was to determine the
spectrum of treatment possibilities with the tooth positioning
appliance. The data collecting process and the measurements should
be done by specially developed digital computer-based methods.
Patients and Methods: 738 teeth of 28 individuals, treated in the
department of orthodontics at the Ludwig-Maximilians-University
Munich, were examined over the time period of treatment with the
tooth positioning appliance. The casts at the end of multiband/
multibracket treatment, the setup models and the casts at the end
of positioner treatment were digitalized. These digital images were
measured and then examined by the computer software programme
DiagnoseFix 2001. The results were mathematically categorized and
statistically analysed with SPSS 10.0, mostly using non-parametric
tests. Results: The newly developed method on the basis of the
programme DiagnoseFix 2001 is cheap, sufficiently accurate and can
easily be adapted. It allows the fast and easy calculation of
distances and angles from two-dimensional digital pictures. It was
found that a mathematically defined axis of symmetry is a more
accurate reference for model measurements than the palatine raphe.
The tooth positioning appliance is not so efficient in the
prevention of a relapse. However the tooth positioner can move
teeth effectively according to the setup in a sagittal and
transversal direction and rotate them. The extent of movements is
nearly independent of anamnestic parameters as is age or gender of
the patient. For all kinds of movement one should consider an
overcorrection in the setup of approximately a third larger than
the desired result. The positioner-induced tooth movements were
about 4.8° in rotation, 0.6 mm in the sagittal direction and 0.4 mm
in the transversal direction. The average success rate was 62 % in
rotations, 48 % for sagittal and 50 % for transversal effects. A
large interindividual range concerning the success rate could be
observed (p
spectrum of treatment possibilities with the tooth positioning
appliance. The data collecting process and the measurements should
be done by specially developed digital computer-based methods.
Patients and Methods: 738 teeth of 28 individuals, treated in the
department of orthodontics at the Ludwig-Maximilians-University
Munich, were examined over the time period of treatment with the
tooth positioning appliance. The casts at the end of multiband/
multibracket treatment, the setup models and the casts at the end
of positioner treatment were digitalized. These digital images were
measured and then examined by the computer software programme
DiagnoseFix 2001. The results were mathematically categorized and
statistically analysed with SPSS 10.0, mostly using non-parametric
tests. Results: The newly developed method on the basis of the
programme DiagnoseFix 2001 is cheap, sufficiently accurate and can
easily be adapted. It allows the fast and easy calculation of
distances and angles from two-dimensional digital pictures. It was
found that a mathematically defined axis of symmetry is a more
accurate reference for model measurements than the palatine raphe.
The tooth positioning appliance is not so efficient in the
prevention of a relapse. However the tooth positioner can move
teeth effectively according to the setup in a sagittal and
transversal direction and rotate them. The extent of movements is
nearly independent of anamnestic parameters as is age or gender of
the patient. For all kinds of movement one should consider an
overcorrection in the setup of approximately a third larger than
the desired result. The positioner-induced tooth movements were
about 4.8° in rotation, 0.6 mm in the sagittal direction and 0.4 mm
in the transversal direction. The average success rate was 62 % in
rotations, 48 % for sagittal and 50 % for transversal effects. A
large interindividual range concerning the success rate could be
observed (p
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