EFFICACY OF TEMPORARY FIXED RETENTION FOLLOWING ...

straight edge across the occlusal plane to the deepest portion of the Curve of
Spee (Figure 3-10).
4. MC, Molar Correction: With casts held in occlusion, the distance is recorded
from mesiobuccal cusp tip of U6 to 1 mm distal of the mesiobuccal groove of
L6 (Figure 3-2).
5. ASR, Anterior Segment Ratio: The ratio of the Anterior Segment Depth
divided by the Anterior Segment Width (Figure 3-6).
6. ISR, Incisor Segment Ratio: Similar to the ASR, but this dimension contains
only the four mandibular incisors. Incisor segment ratio is the measure of the
width of the four incisors divided by the distance from the midline point to
this line (Figure 3-8). A lesser value indicates a more curved arc formed by
the incisal edges of the four incisors as viewed occlusally.
7. IAR, Incisor Aspect Ratio: The ratio of the depth of the lingual aspect of the
mandibular left central incisor divided by the width as viewed occlusally
(Figure 3-8). A greater value indicates a more upright incisor position.
8. ASP, Anterior Segment Perimeter: The calculated distance available for the
placement of six anterior teeth in alignment between the right and left divide
points and the midline point (Figure 3-7).
9. UMW, Maxillary Intermolar Width: The linear distance (in millimeters) from
the mesiobuccal cusp tip of the upper (maxillary) right first molar to the
mesiobuccal cusp tip of the upper (maxillary) left first molar.
10. LMW, Mandibular Intermolar Width: The linear distance (in millimeters)
from the mesiobuccal cusp tip of the lower (mandibular) right first molar to
the mesiobuccal cusp tip of the lower (mandibular) left first molar.
11. UCW, Maxillary Intercanine Width: The linear distance (in millimeters) from
the upper (maxillary) right canine cusp tip to the upper (maxillary) left canine
cusp tip.
12. LCW, Mandibular Intercanine Width: The linear distance (in millimeters)
from the lower (mandibular) right canine cusp tip to the lower (mandibular)
left canine cusp tip.
13. ISD, Incisor Segment Depth: The perpendicular distance (in millimeters)
from the midline point (Figure 3-5) to the Incisor Segment Width line (Figure
3-8; the line that delineates the width of the four incisors).
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