Similar to supernumerary teeth, an extra root or several more can develop beyond the normal number of root(s) typical for the specific tooth type (Figures 42‑43). Whether primary or permanent, any tooth can form an accessory root.7 Third molars are especially prone to supernumerary roots, but the other molars from either arch may be involved as well as mandibular canine and premolar teeth.7,10 At times, the extra root is easily seen radiographically while in other instances it may be fused to the other root(s) or so small as not to be visible.7,10 Although not typically a problem, the extra root may present a challenge if endodontic treatment or extraction is indicated.7,10
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