الفهرس 
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Abstract
Aim: To evaluate the incidence of impacted mandibular third molar in different anteroposterior and
vertical facial skeletal patterns and to evaluate the angle of impaction of mandibular third molar.
Methodology: 207 Panoramic and lateral cephalometric radiographs for patients above 20 years old
with impacted mandibular third molar were recruited from the orthodontic department clinics in
multiple universities in Egypt and traced using WebCeph ™ software. from the lateral cephalograms,
three anteroposterior measurements were taken which were termed as ANB, A-B difference and Wits
appraisal and three vertical angles were measured which were SN/MP, MMPA and FMPA to
determine different skeletal facial types. The angulation of mandibular third molar impaction was
determined by β angle according to Winter’s classification from the orthopantomogram.
Results: Among all 207 analyzed cases, impacted third molars were detected in (38.6%) cases
unilaterally and (61.4%) bilaterally. Anteroposteriorly, the higher percentage of total impactions was
found in subjects with a class 2 skeletal pattern (97.2%). Vertically, the higher percentage of total
impactions was found in subjects with a mesocephalic facial pattern (45.9%). The most common type
of impaction was mesioangular based on Winter’s classification.
Conclusions: A higher incidence of lower third molar impaction was found in subjects with a class
2 skeletal pattern. A higher incidence of lower third molar impaction was found in subjects with a
mesocephalic facial pattern. In almost all skeletal facial types, the mesioangular position of the
impacted mandibular third molar was the most prevalent position.