title: Correlations between photogrammetric measurements of tooth mobility and the Periotest method.
abstract: OBJECTIVE
  The purpose of the present study was to investigate whether or not the quantitative Periotest values of anterior teeth correlate with quantitative metric values of tooth mobility under vertical (VL) and horizontal load (HL) in periodontally healthy subjects.
  
  
  METHODS
  Thirty-one subjects with good periodontal conditions were included and subjected to two different tooth mobility measurement techniques. Periotest values were measured at reproducible measurement points in the vertical (vPT) and horizontal (hPT) dimensions of upper central and lateral incisors and canine teeth. Using the optical measurement technique (photogrammetry), tooth mobility was measured under load in the horizontal (HL) and vertical loading directions (VL) at different load forces. Pearson's correlation coefficients were used to determine exploratory associations.
  
  
  RESULTS
  The comparison between hPT and HL showed no correlations between the two measurements except for 'weak' and 'moderate' correlations for teeth 21 and 23. The analysis of correlations between vPT and VL data showed statistically significant correlations for both the left and right canine teeth that ranged from 'weak' to 'high'. Comparisons between hPT values and VL and between vPT and HL showed significant correlations at a few loading forces only.
  
  
  CONCLUSIONS
  Quantitative Periotest values cannot be used to draw conclusions about the metric assessment of tooth mobility. For this purpose, the photogrammetric technique could be an additional tool for scientific questions.
authors.affiliation: Dental Clinic 2, Department of Prosthodontics, University Clinic Erlangen, Germany. matthias.goellner@uk-erlangen.de
authors.forename: Matthias
authors.initials: M
authors.lastname: Goellner
authors.forename: Christine
authors.initials: C
authors.lastname: Berthold
authors.forename: Stefan
authors.initials: S
authors.lastname: Holst
authors.forename: Manfred
authors.initials: M
authors.lastname: Wichmann
authors.forename: Johannes
authors.initials: J
authors.lastname: Schmitt
mesh_terms: D000328:Adult; D001732:Bite Force; D003481:Cuspid / Q000503:physiopathology; D003799:Dental Stress Analysis; D006801:Humans; D007091:Image Processing, Computer-Assisted; D021621:Imaging, Three-Dimensional; D007180:Incisor / Q000503:physiopathology; D010780:Photogrammetry; D023861:Photography, Dental; D018709:Statistics, Nonparametric; D014086:Tooth Mobility / Q000175:diagnosis*; D055815:Young Adult