Which anatomical landmark is generally considered the ideal apical limit for root canal instrumentation and obturation?
- Correct answer
The apical constriction (minor apical diameter)
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The major apical foramen
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The radiographic apex
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The cementoenamel junction
This question is one of 15 in AFK practice: Endodontics. Test yourself on all of them.
Practice quiz FlashcardsExplanations
The apical constriction is the narrowest part of the canal and lies slightly coronal to the major foramen and the radiographic apex, so it is the traditional apical endpoint for instrumentation and obturation. Working to the radiographic apex risks over-instrumentation, because the foramen usually exits short of it.
Source: Cohen's Pathways of the Pulp — oneguy
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