Endodontics
Course Review
Enoch Ng, DDS 2014
Endodontic Surgery
Root End Resection
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Most common cause for NSRCT failure, need for root end resection = incomplete cleansing of root canal system
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Amount of root end resection
1mm 2mm 3mm
Apical ramifications 52%
78%
98%
Lateral canals
40%
86%
93%
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Root End Surgery
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Flap resection
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Ostectomy
o
Root end resection – apicoectomy
o
Root end preparation – retro-prep
Class I prep – 3mm in depth
Centered in canal in along axis of tooth
Include all canals and isthmus area between canals
o
Root end filling – retro-filling
Materials – superEBA, IRM, amalgam, GP, ZOE, cavit, GIC, resin bonding agents, MTA
Best choices – MTA, IRM, superEBA
Hazardous material = Portland cement (75% by weight)
o
Root end finishing
o
Closure and suturing
Extraction replantation
o
Good candidates – straight root (some furcation)
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Good/bad candidate – fused roots
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Bad candidate – wide/dilacerated roots
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Cut off 2-3mm off bottom of roots before reimplantation
Other Procedures
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Root resection/horizontal root amputation – 4.5month postop
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Repair of resorptive defect
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Repair of procedural complications
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Autotransplantation
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Decompression of large apical lesions – syringe used to withdraw fluid
Advances in endo surgery
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Dental operating microscope
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Microsurgical instruments
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Soft tissue management principles
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Ultrasonic root end preparations
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Improved root end filling materials
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Regenerative techniques