Tuesday, 20 September 2011

Root resorption and orthodontics

A Swedish prospective clinical trial (Gothenburg), of 152 orthodontic patients, is published at the current issue of The Angle Orthodontist. The study is performed on CBCT data collected at baseline, 6-months in treatment, and treatment finish.

CBCT allows for differentiation of the exact root surface that has been resorbed, such as lingual/palatal, buccal, or mesio-distal. This cannot be differentiated by conventional 2D radiographs.

A case of severe root resorption
  • As expected up to 91% of all teeth showed some degree of root shortening.
  • 7% of the sample had at least one tooth with more than 4mm of root shortening (however no more than 3 of those teeth per patient)
  • The root shortening rate/month, was significantly larger for the period after the 6 months in treatment when compared to the first months.
  • The upper dentition was affected more than the lower.
  • Lastly, the palatal surface of the upper centrals and laterals was the most affected region (that could be associated with the compression of those regions when torquing moments, or intrusional forces are applied at the bracket level)

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