OWN - Quintessenz Verlags-GmbH
CI - Copyright Quintessenz Verlags-GmbH
OCI - Copyright Quintessenz Verlags-GmbH
TA - J CranioMand Func
JT - Journal of Craniomandibular Function
IS - 1868-4149 (Print)
IP - 3
VI - 1
PST - ppublish
DP - 2009
PG - 229-239
LA - en
TI - The functional relevance of cusp angles in naturally healthy dentition
FAU - Müller, Matthias
AU - Müller M
FAU - Ruge, Sebastian
AU - Ruge S
FAU - Kordaß, Bernd
AU - Kordaß B
CN -
OT - Bennett angle
OT - condylar path
OT - cusp angle
AB - Three-dimensional scans and measurements were taken of casts of the maxillary arches
of 18 subjects with naturally healthy tooth structures. The cusp angles of the
premolars and molars and the palatal inclines of the canines were determined. The
functional measurements in relation to the joints were taken using the Cadiax
Compact. The results of the measured tooth angles showed a sequential decrease in the
palatal incline of the buccal cusps from the canines towards the second molars,
whereas the buccal angles of the palatal cusps increased from mesial to distal. The
inner angle between the two cusp angles at the flanks sloping towards the fissure
widened from mesial to distal in all casts. In principle, this confirmed the occlusal
scheme of sequential guidance, with canine dominance through the general distribution
of cusp angles. A direct relationship between the cusp angles and the measurements of
condylar function (as it exists between the horizontal condylar guidance inclination
and Bennett's angle) could not be verified (r < 0.6 and P > 0 according to Spearman's
rank correlation coefficient). However, evidence of other complex relationships
became apparent. A steep condylar path and canine guidance indicated that the lateral
cusps were just as steep. A wide Bennett angle resulted in flat cusp angles.
Considering the fact that it is not the individual cusp angles, but the
three-dimensional torsion curve of sequential cusp angles that is influenced, there
are clear dependencies with bilateral symmetry (with r >= 0.6 and P < 0.05). This
interdependence is found between two indices: one is derived from the quotient of the
sums of the buccal divided by the palatal cusp angles and the other index is derived
from the addition of the canine inclination angle with the contralateral condylar
path and the subtraction of the respective Bennett angle.
AID - 856086