Primary 85 (ICDAS 3, C3, shadow, 70% root): applying…
Prevention and cariology questions test evidence-based decision-making — fluoride protocols, caries risk assessment, recall scheduling. This high-difficulty vignette tests your ability to work through clinical details and arrive at the correct management.
An 8-year-old at-risk recall boy presents with: Primary tooth 85 — ICDAS 3, C3 bitewing, shadow visible below marginal ridge, 70% root remaining. Permanent tooth 16 — ICDAS 3, C4 bitewing, no shadow visible. Permanent tooth 26 — ICDAS 1 only (visible after 5 seconds air drying). He drinks fluoridated water and uses 1000 ppm toothpaste. Primary 85 (ICDAS 3, C3, shadow, 70% root): applying the primary C3 further consideration pathway in order — what is the management?
- A. Do not restore — C3 in primary teeth is always managed non-invasively with fluoride varnish only
- B. Separate the tooth to confirm cavitation before deciding — shadow alone is insufficient
- C. Restore — exfoliation is not imminent (70% root remains), and shadow below marginal ridge satisfies the restoration criterion
- D. Extract — C3 with shadow in a primary tooth indicates the tooth is unsalvageable
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Integration: Primary C3 further consideration (Table 5, sequential): Step 1 — within 12 months of exfoliation? No (70% root = >50%). Step 2 — shadow below marginal ridge? YES → restore. Step 3 (separation) is not reached because Step 2 triggered. SOURCE — Evans RW, Dennison PJ. CMS for children, ADJ 2009;54:381-389, Table 5, C3 further consideration
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