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Zahnheilkunde 6. Oktober 2011

A three-dimensional computerized tomography study into the morphological interrelationship between anterior and posterior guidance and the occlusal scheme in human Caucasian skulls

Background The articular eminence of the glenoid fossa
together with the occlusal guiding surfaces represent two
fundamental determinants of mandibular movement
and even though subject to numerous investigations the
relationship between both structures still remains unclear
today. The purpose of this 3D investigation was to
characterize the inclinations of the articular eminence,
measure the inclinations of maxillary occlusal guiding
surfaces, investigate the occlusal scheme present and
examine the relationship between anterior and posterior
Methods Several three-dimensional measurements
obtained through computerized analysis of virtual models
of 163 human skulls reconstructed from cone-beam
computed tomography (CBCT) images were analyzed
and correlated.
Results The inclinations of the articular eminence
and of the occlusal guiding surfaces revealed large individual
variation. Second molars showed the lowest
inclination values with a significant number of first
and second molars presenting buccally inclined guiding
elements. Anterior guidance showed slightly higher
inclination values than posterior guidance. Significant
correlations were found between the inclination of the
articular eminence and the posterior passive centric line
of occlusion.
Conclusions The occlusal scheme of sequential guidance
with front canine dominance was confirmed. Inferring
a direct etiologic anatomical interrelationship
between anterior and posterior guidance may be an
oversimplification of the craniomandibular system.

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