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A method for quantifying positional change of the condyle on lateral tomograms by means of digital subtraction
Author(s) -
Hiroki Sato,
Masafumi Ohki,
Hideki Kitamori
Publication year - 1998
Publication title -
journal of oral rehabilitation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.991
H-Index - 93
eISSN - 1365-2842
pISSN - 0305-182X
DOI - 10.1046/j.1365-2842.1998.00252.x
Subject(s) - subtraction , condyle , translation (biology) , rotation (mathematics) , temporomandibular joint , tomography , joint (building) , computer science , mathematics , biomedical engineering , artificial intelligence , orthodontics , medicine , physics , optics , biology , engineering , architectural engineering , biochemistry , arithmetic , messenger rna , gene
A method is described for quantifying the positional change of the condyle on lateral tomograms of the temporomandibular joint (TMJ) by use of digital subtraction. This method permits rotational and translational changes of condylar reference points for easy measurement. Accuracy was evaluated in vitro using both TMJs of two dry human skulls and in vivo with seven volunteers. The average absolute error of the angle of rotation in vitro was 0·67°. For the anterior–posterior element of translation the average absolute error was 0·07 mm, and for the superior–inferior element of translation it was 0·06 mm. From these results, we could conclude that the method provides clinically acceptable measurement accuracy. To verify the usefulness of the method, a clinical application is presented.