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Paper Point Measurement

In a root canal with an immature (wide open) apex, one way of determining the working length is to gently pass the blunt end of a paper point into the canal after profound anesthesia has been achieved. The moisture or blood on the portion of the paper point that passes beyond the apex may be an estimation of working length or the junction between the root apex and the bone. In cases in which the apical constriction has been lost owing to resorption or perforation, and in which there is no free bleeding or suppuration into the canal, the moisture or blood on the paper point is an estimate of the amount the preparation is overextended.

Again, it must be kept in mind that this paper point measurement method is a supplementary one. The newer paper points have millimeter markings. These paper points have markings at 18, 19, 20, 22, and 24 mm from the tip and can be used to estimate the point at which the paper point passes out of the apex. These paper points were designed to ensure that they could be inserted fully to the apical constriction.

This will be dealt separately in detail in the next section

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