For the C3 on primary tooth 75 (40% root remaining, no…
Prevention and cariology questions test evidence-based decision-making — fluoride protocols, caries risk assessment, recall scheduling. This exam-level vignette tests your ability to work through clinical details and arrive at the correct management.
A 10-year-old has primary molar 75 with C3 distal radiolucency and 40% root remaining (no marginal ridge shadow). Permanent molar 36 has an identical C3 mesial radiolucency. For the C3 on primary tooth 75 (40% root remaining, no shadow), what comes next?
- A. Do not restore — less than half root remaining means exfoliation is approaching
- B. Restore immediately — C3 in a primary tooth with resorption always needs filling
- C. Place a stainless steel crown to protect the tooth until natural exfoliation
- D. Apply fluoride varnish and monitor 6 months before deciding on operative care
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Primary C3 further consideration: (1) Do not restore within 12 months of exfoliation (clue: <50% root remaining — met here at 40%). (2) Restore if shadow below marginal ridge — no shadow. (3) Otherwise separate to confirm cavitation. Check 1 met → do not restore. SOURCE — Evans RW, Dennison PJ. CMS for children, ADJ 2009;54:381-389, Table 5, C3 further consideration
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