2010 RWISO Journal - Roth Williams International Society of ...

illary cast in the vertical dimension, with a mean of 2.19 mm
for the maxillary right first molar, 2.45 mm for the maxillary
left first molar, and 1.90 mm for the maxillary right central
incisor.
2. Statistically significant differences (p < .001) were
found between the true hinge face-bow mounted maxillary
cast and the estimated earpiece face-bow hinge mounted
maxillary cast in the A-P direction, with a mean difference
of 3.82 mm between the maxillary right first molars, 3.10
mm between the maxillary left first molars, and 3.05 mm
between the maxillary right central incisors.
3. Statistically significant differences (p < .001) were
found between the true hinge face-bow mounted maxillary
cast and the estimated earpiece face-bow hinge mounted
maxillary cast in the transverse dimension, with a 2.23-mm
difference between the maxillary right first molars and a
2.60-mm difference between the maxillary left first molars.
4. This study found that there is a significant difference
between the arbitrary earpiece face-bow hinge axis and
the true hinge face-bow hinge aixs. Thus, when an arbitray
earpiece face-bow hinge axis transfer is used, the maxillarymandibular
complex is placed in an incorrect position in the
articulator. The end result is a lack of functional harmony. ■
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