Endodontics
Course Review
Enoch Ng, DDS 2014
Examination
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Etiology
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Carious lesion causes bacterial infection, leading to periapical granuloma
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Diagnosis and treatment plan
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Case selection and referral
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Treatment
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Prognosis
Sinus Tracts
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Is NOT a dental fistula
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Fistula = communication between 2 internal organs/organ and body surface
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Sinus tract = tract leading from area of inflammation to an epithelial surface
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Fairly evenly distributed between Mx and Mn (of 758, 400 Mx and 358 Mn)
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1600 teeth with PA lesions, 136 had sinus tracts (8.5%)
87.5% open to facial side
5.8% open to palatal
5.1% found extraorally
1.5% perforate Mn lingual sulcus
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In Monkeys, need >100 days to form sinus tract
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100-200days = 46% of openly exposed teeth develop sinus tracts (none epithelial lined)
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>200 days = 4/7 sinus tracts lined by epithelium
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Dentoalveolar sinus tract – usually route of drainage from inflammatory PA lesion
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Follows path of least resistance through bone, periosteum, and mucosa
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Usually close to source of drainage, but may be some distance as well
Radiography
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Aids in diagnosis
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Visualization of anatomy
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Used for estimating working length
Rubber Dam
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Potential leakage
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Subgingival caries
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Fractures
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Defective restorations
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Open margins