Despite these conventional analyses, a vertical reference plane (SV) from sella, perpendicular to Frankfort Horizontal plane, was reconstructed, and the vertical distances from the apex and incisal point of the maxillary central incisor were measured to determine the amount of horizontal movement of the maxillary incisor.
The distances from the apex and incisal point of the central incisor to SV reference plane also decreased significantly (p<0.01), revealing parallel movement of the incisors.
The maximum mesiodistal width (perpendicular to the longitudinal axis of the tooth) and the maximum crown-root length, (parallel to the longitudinal axis of the tooth and between the most apical point of the gingival margin and the most incisal point
of the anatomic crown) of the maxillary central incisors, lateral incisors, and canines was recorded for each tooth.
The authors identified changes in the distances from the lateral palatine rugae points of the first and third rugae to the incisal point
, the canine point and the tuberosity line.
* infraorbital foramen to incisal point
(IF-IP) (Figure 1).
The vertical distance between the marked point and the most prominent incisal point of the mandibular cuspid was measured with a CPITN probe.
In order to determine if and how much the occlusal vertical dimension (OVD) changed after placing a PMC, the vertical distance between the most prominent incisal points of the left maxillary and mandibular cuspid/canine was scored as the overbite (as displayed in Figure 1).
angle to disto-labio-incisal point angle was calculated and shown in Tables 1 & 2.
Using the skull radiographs, the following distances were measured bilaterally: TB-MR--tympanic bulla to the mesial root of the first molar; TB-IF--tympanic bulla to infraorbital foramen; and IF-IP --infraorbital foramen to incisal point