3. AIM
• To study the relationship b/w the presence
and influence of Unerupted Mandibular 3rd
Molar and #’s of the Mandibular Condyle.
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4. INTRODUCTION
• It’s reported that Pts with unerupted Mand molar
were likely to have an angle # than those Pts
without unerupted Mand 3rd
molar’s.
• Reason for this is, Angle region that contains the
unerupted 3rd
molars has a decreased cross
sectional area of bone, and this weakens the
Mand because the tooth occupies more of
Osseous space ,so its an area of lowered
resistance to External forces
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5. • Based on this evidence, some authors
advocated removing unerupted Mand 3rd
molar to
prevent Mand angle #, however its been
observed that Pts without unerupted Mand 3rd
molar were more likely to have a Condyle # than
those with unerupted mand 3rd
molars.
• If the Mand #’s more often at the Condyle, rather
than at the angle in the absence of Unerupted 3rd
molar,it may not be beneficial to remove the
unerupted 3 rd molar as a means of preventing
Mand angle #, because the treatment of Condyle
# is more challenging than that of Angle #.
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6. MATERIALS & METHODS
• It’s a retrospective study of all Mand #’s treated
at the Univ from January 1999 to April 2004.
• During this period 439 Pts sustained Mand #’s,
data’s were collected from the Pts records and
X-rays for the following Information: Age, Sex,
causes of #’s presence and state of Lower 3rd
molars and the number and locations of Mand
#’s.
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7. • From the obtained information, the Pts
were divided into 2 groups according to
whether or not, there were the unerupted
3rd
molar teeth.
• {Any 3rd
molar partially or completely
covered by bone tissue was regarded as
unerupted}
• Data were analysed by calculating the
means and standard deviation, and the
Cohart comparison were made by the Chi
square test and Standard t test.
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8. RESULTS
• A total 439 Pts were divided into unerupted 3rd
molar present group and the unerupted 3rd
molar
absent group.
• 439 Pts had a total of 624 #’s of the mandible.
The unerupted 3rd
molar present group of 226
Pts had 328 #’s. The unerupted 3rd
molar absent
group of 213 Pts had 296 #’s.
• Unerupted 3rd
molar present group had a higher
proportion of Angle # than those pts in the
unerupted 3rd
molar absent group.
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9. • On the other hand, Condyle #’s were common in
the unerupted 3rd
molar absent group than in the
uneruprted 3rd
molar present group.
• With regard to Symphysis and Angle
combination #, there were more Symphysis and
Angle combination #’s in the unerupted 3 rd
molar present group than in the unerupted 3 rd
molar absent group.
• In contrast there were more Symphysis and
Condyle # in the unerupted 3rd
molar absent
group than in unerupted 3rd
molar present group.
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10. DISCUSSION
• Due to the reasons said earlier Angle #’s are
more common in Pts with unerupted 3rd
molars
• At the same time Pts without unerupted 3rd
molar
are more prone to have condylar #’s.
• Though Condylar #’s are considered to be a
safety valve mechanism to protect the Middle
cranial fossa in traumatic situations, precise
reduction and fixation of Condyle is always
challenging to Oral surgeons, due to risk of
involvement of facial nerve injury.
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11. • On the other hand reduction and fixation
of of Angle #’s are easily performed due to
easy access and visibility during plating.
• This should not be the criteria for
prophylactic removal of symptom free
unerupted 3rd
molar to strenghten the
Angle.
• At the same time the Pt is at high risk for
Condylar #’s.
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12. • More over, when large force are applied to a
small area of the mandible, the # will occur at
the point of Impact, regardless of the
architecture of the mand at that site. Therefore
the majority of the Pts who had a high force of
Impact on their chins as a result of a fall suffered
# of the Symphysis inspite of the fact Symphysis
has the largest cross section area of the Mand.
• So irrespective of the unerupted 3rd
molar being
removed or retained, #’s of Mand do occur (At
Condyl or at othe regions).
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13. CONCLUSION
• The findings in these cases emphasize
that #’S of the Condyle region showed a
significantly higher incidence In Pts
without unerupted 3rd
molar than in Pts
with unerupted 3rd
Molars….
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14. Thank you
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