title: Photogrammetric measurement of initial tooth displacement under tensile force.
abstract: The purpose of this study was to quantitatively measure tooth displacement under low horizontal tensile force (≤18 N) and to test the reproducibility of measurements. Anterior tooth mobility was measured using a photogrammetric measurement technique in 23 periodontally healthy subjects. While slowly increasing the tension on each tooth, an automated software program recorded three-dimensional tooth displacement at 3 N intervals, up to 18 N. Measurements were repeated three-times for each tooth. The vector of absolute tooth mobility in the buccal direction was calculated. Intra-class correlations of the three repeated measurements of each tooth were calculated and ranged between "good" and "optimal". The agreement of measurements was significant (p≤0.05). The analysis of differences between the deviation vectors of contralateral teeth revealed that most differences emerged to be statistically non-significant. The combination of a mechanical loading approach with the optoelectronic system allowed the measurement of three-dimensional tooth mobility in vivo.
authors.affiliation: Dental Clinic 2, Department of Prosthodontics, University Clinic Erlangen, Glueckstr. 11, 91054 Erlangen, Germany. matthias.goellner@uk-erlangen.de
authors.forename: Matthias
authors.initials: M
authors.lastname: Goellner
authors.forename: Johannes
authors.initials: J
authors.lastname: Schmitt
authors.forename: Matthias
authors.initials: M
authors.lastname: Karl
authors.forename: Manfred
authors.initials: M
authors.lastname: Wichmann
authors.forename: Stefan
authors.initials: S
authors.lastname: Holst
mesh_terms: D000328:Adult; D001696:Biomechanical Phenomena; D003481:Cuspid; D005260:Female; D006801:Humans; D007180:Incisor; D007568:Jaw; D008297:Male; D010780:Photogrammetry; D015203:Reproducibility of Results; D014086:Tooth Mobility / Q000209:etiology; D055815:Young Adult