Extraction vs Non-Extraction- Part 5: How the decision to extract or not can have an affect on the length of the roots

Root resorption, or shortening of the roots, is often cited as having many factors for its occurrence; however, one of the most common causes for this pathology is expansion or flaring of roots into adjacent un-erupted crowns. Often flared upper lateral incisors are a result the unerupted canine crowns adjacent to the roots of the lateral incisors applying pressure on these roots as the canines are erupting. Any movement of these roots toward the crowns of the canines will create resorption of the lateral incisor’s roots. This is often seen in early treatment cases where an attempt is made on the part of the orthodontist to close spaces between the upper front four incisors at a young age to create more room for the canines or I-teeth. Sometimes it is better to remove the primary or baby canines rather than risk root resorption of the lateral incisors for such a small gain.

Another common cause is flaring of the upper incisor crowns causing the roots to tip putting pressure on the roof of the mouth or palate. The palate is comprised of extremely hard bone that does not resorb away when the roots of the teeth contact it; therefore the roots resorb and subsequently shorten after they are pressed against the palate. This is usually seen in cases when there is an under-bite present.

These are just a few common concerns associated with root resorption that must be taken into account when considering extraction or non-extraction of permanent teeth. The next blog will deal with the length of treatment associated with extraction and non-extraction treatment.