© 1983 by European Orthodontic Society
Normal and abnormal growth of the mandible. A synthesis of longitudinal cephalometric implant studies over a period of 25 years*
Copenhagen, Denmark
Address for correspondence Arne Björk, Vibeke Skieller, Institute of Orthodontics, Royal Dental College, Jagtvej 160, DK-2 100 Copenhagen, Denmark.
This paper examines the complex rotation processes that occur during growth in normal and abnormal mandibular development. The bony mandibular corpus and its soft tissue covering, the matrix, are considered as independent tissue systems capable of independent rotation. Both forward and backward rotation can be divided into three components: the total rotation, the matrix rotation, and the intramatrix rotation, showing different individual interrelationships and a changing composition in each individual during the entire period of development. Dividing the mandibular rotation into these components permits measurement of the, often considerable, remodelling at the lower border of the mandible.
Orthodontic treatment influences the components of mandibular rotation and thus induces a change in the remodelling of the mandible.
The findings do not support the view that the matrix is a dominating factor and that bone formation is secondary in mandibular growth, but point to considerable independence in development of the two tissue systems.
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