Dentale Anomalien bei palatinaler Eckzahnverlagerung unter besonderer Berücksichtigung der Zahnbreiten im Oberkiefer

AIM: The aim of this retrospective trial was to investigate
differences in mesiodistal and vestibulo-oral crown sizes of
naturally, fully-erupted permanent maxillary teeth between patients
with and without palatal canine displacement. PATIENTS AND METHOD:
115 patients (mean age: 14 years 10 months; females: 77 males: 38)
treated in the Department of Orthodontics, University of Munich
were included in the study. 65 of the patients showed at least one
palatally-displaced canine. Diagnosis and the location of the
displacement were determined on the basis of standardized
radiographs and confirmed by surgical documentation. Each maxillary
tooth's mesiodistal and vestibulo-oral width was measured using a
dial caliper on each dental cast. Excluded were partially-erupted
teeth and surfaces with caries or restorations that had to be
measured. An analysis of available space was made by evaluating the
pre-treatment dental casts of all patients included in the study.
RESULTS: Comparing the tooth widths of patients with unilateral
canine displacement with the corresponding contralateral quadrants,
we noted a statistically significant difference, namely that the
central and lateral incisors and the canines of the affected side
were narrower than those of the non-affected side in the same
patient. Moreover, the displaced upper canines showed an increase
in vestibulo-oral dimension. Overall tooth width (including all
tooth groups) in patients with palatally-displaced canines was
significantly less than that in the control group. However, when
comparing the crown diameters of unilaterally- and
bilaterally-affected patients, no differences in tooth-size were
observed. The space-analysis showed excessive dental-arch space in
patients with a palatally-displaced canine. CONCLUSION: Patients
affected by palatal canine displacement showed significantly
smaller maxillary tooth size.