When a tooth undergoes root canal treatment, it often becomes weaker because a significant amount of its natural structure has been lost during the treatment. This is where the ferrule effect plays an important role. The ferrule effect is a band of 360 degree healthy tooth structure. It extends above the gingiva line and is circled by the final crown. A proper ferrule helps to eat and chew properly by distributing the forces equally. This force reduces the risk of root fractures and. Crown failure is also reduced by it. Studies have consistently shown that teeth restored with an adequate ferrule have a much better long term prognosis.
How is the ferrule effect achieved?
During root canal treatment and crown preparation, much of a healthy dentin is left as much as possible. For the crown to encircle the entire tooth, a 360 degree band should be there, this is achieved by maintaining 1.5-2 mm tooth above the gingiva. If adequate ferrule is not achieved , then extraction may be considered.
Did you know 2mm of healthy tooth structure can increase the lifespan of RCT treated teeth.
MBH/PS