Favorable change in the length or position of the mandible

Lower incisor mesial movement, relative to upper incisor IMP, will be augmented if there is a favorable change in the length of the mandible and hence a mesial change in 'B' point. This greatly assists treatment mechanics and in most cases enhances the facial profile of the result. Also, less lower incisor proclination will be needed if'IV point moves forward during treatment.

An increase in mandibular length is therefore desirable for most (Mass II cases, but it is questionable whether there is any procedure which the orthodontist can follow which will achieve this. It is a large topic, but it may briefly be discussed under the following headings:

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