Dental OSCE Practice Exam 2025 – The All-in-One Guide to Master Your Clinical Skills!

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What is the maximum size that a post should exceed in relation to the diameter of the canal?

1/2 diameter of the canal

1/3 diameter of the canal

The maximum size of a post relative to the diameter of the canal is best recommended to be no larger than one-third of the canal's diameter. This ratio is based on the need to retain sufficient dentin around the canal to maintain tooth integrity and strength after endodontic treatment. When a post is excessively large compared to the canal, it compromises the remaining tooth structure, potentially leading to dentin fracture or failure of the restoration due to a lack of support.

A post that is one-third the diameter of the canal strikes a balance between effective retention of the post while ensuring enough dentin remains to provide support and prevent the risks associated with over-preparation. Maintaining this proportionality also aids in effective sealing and reduces the chances of complications that may arise if the post takes up too much space within the canal itself.

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Equal to the diameter of the canal

1/4 diameter of the canal

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