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Quantitative computerized analysis of lower incisor changes: a longitudinal implant study in man.

Computer aided interpretation of longitudinal growth data has been presented in summary fashion for four or thirty-six young patients with maxillary and mandibular tantalum implants employing the U.C.S.F. computer program. Broad generalizations of changes in mandibular morphology cannot be made from the small sample. Caution is the watchword in employing so-called natural reference points for superpositioning over an extended period of growth. Identification of cephalometric point B is difficult on a long-term serial basis. The direction of eruption of the lower incisor tip can be followed rather easily and accurately in patients with mandibular implants but varies considerably from patient to patient. Discrepancies arising between customary anatomic tracing methods and implant references have been demonstrated.