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4. IMPACTED TOOTH – DEFINITION
• Impacted tooth is one that fails to erupt & will
not eventually assume its anatomical arch
relationship beyond the chronological
eruption date.
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5. PELL & GREGROY’S CLASSIFICATION
• Relationship of teeth to Ramus
• Relative depth
• Long axis of the tooth
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33. CHISEL vs BUR
CRITERIA
Chances of fracture of bone
CHISEL & MALLET
Relatively High
BUR
Less Possibility
Healing of Bone
Good
Delayed
Post op Edema
Less
More
Dry Socket
Post op Infection
Deeply buried tooth
Incidence is less
High
Less
More
Difficult to Remove
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Relatively Easy
34. Split Bone Technique
VERTICAL ‘STOP CUT’
AT ANTERIOR END
HORIZONTAL CUT
JUST ABOVE LOWER
END OF ‘STOP CUT’
DISTO LINGUAL BONE
FRACTURED WITH CHISEL
AT AN ANGLE OF 45◦
PARALLEL TO E.O.R
LINGUAL PLATE GRASPED
BY HEMOSTAT
TOOTH ELEVATED
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35. Lateral Trephination Technique
• S shaped incision from retromolar fossa across
external oblique ridge
• Bur used to trephine buccal cortical plate over
3rd molar crypt
• Vertical cut anteriorly & posteriorly
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