Comeau, David2018-10-312018-10-3116115392b14341542https://hdl.handle.net/2144/31781PLEASE NOTE: This work is protected by copyright. Downloading is restricted to the BU community: please log in with a valid BU account to access and click Download. If you are the author of this work and would like to make it publicly available, please contact open-help@bu.edu.Thesis (M.Sc.D.)--Boston University School of Graduate Dentistry, 1973. Orthodontics.Bibliography included.The relationship between tooth size and shape, as expressed by the MD/FL index, and post orthodontic stability of the mandibular incisors was studied in two groups of subjects. One group of J6 subjects was selected for perfect post retention mandibular incisor alignment. The other group, consisting of SO subjects, exhibited some post retention mandibular incisor crowding. Those subjects in the group with post retention mandibular incisor crowding had mean MD/FL values which were significantly higher than those in the perfect alignment group. Since the correlation coefficient between the two variables was quite low, the predictive value of the MD/FL index in individual situations is questionable. Nevertheless, tooth shape, as expressed by the MD/FL index, should be considered when evaluating the potential factors contributing to post orthodontic mandibular incisor malalignment.en-USThis work is protected by copyright. Downloading is restricted to the BU community. If you are the author of this work and would like to make it publicly available, please contact open-help@bu.edu.MalocclusionIncisorMandibleThesis/Dissertation99175047090001161