IDEAL
ARCH FORM
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Dental arch vs. voussoir arch. As in a voussoir arch, the precise
positional relationship of each toothis necessary for proper transmission
of force to maintain the dental arch integrity. In the voussoir
arch, shape and position of each unit maintain arch integrity against
the force of gravity. In the dental arch, shape and position supported
by the root in the denture base (a very plastic material-bone) maintain
arch integrity against the competing forces acting in all three
planes. Although there is no keystone in the dental arch, the incisors
(A) may bethought of as haunches, the cuspids (B) as springers,
and the bicuspids and molars (C) as pillars.
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