Human tooth movement by continuous high and low stresses

Whitney N. DeForest, Jodi K. Hentscher-Johnson, Ying Liu, Hongzeng Liu, Jeffrey Nickel, Laura R. Iwasakif

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Objective: To compare three-dimensional tooth movements resulting from relatively higher and lower stresses in a split-mouth design. Materials and Methods: Eight volunteers whose maxillary first premolars were removed for orthodontic treatment participated. Each subject's maxillary canines were retracted by randomly assigned constant stresses of 78 kPa and 4 kPa via segmental mechanics. Dental casts depicting 8-10 visits per subject over 84 days and a three-axis microscope were used to measure movements serially. Descriptive statistics and mixed linear modeling were applied for data analyses (α = .05). Results: Teeth moved by 78 kPa had significantly faster (P = .0005) distal movement (0.066 ± 0.020 mm/day) compared to teeth moved by 4 kPa (0.031 ± 0.012 mm/day). Lateral movement and distopalatal rotation were also significantly faster (fourfold and 10-fold, respectively) with higher than with lower stress (P < .0001). Average extrusion-intrusion, crown torque, and tip were small (≤ |0.25| mm, |2.29|°, and |1.98|°, respectively), fluctuated, and not significantly different between high and low stresses. No lag phase of tooth movement was evident. Conclusions: Maxillary canines were retracted faster by 78 kPa than by 4 kPa. Controlled translation was possible with 4 kPa, but 78 kPa outstripped appliance constraints, causing distopalatal rotation.

Original languageEnglish (US)
Pages (from-to)102-108
Number of pages7
JournalAngle Orthodontist
Volume84
Issue number1
DOIs
StatePublished - Jan 1 2014
Externally publishedYes

Fingerprint

Tooth Movement Techniques
Tooth
Canidae
Bicuspid
Torque
Orthodontics
Mechanics
Crowns
Mouth
Volunteers
Therapeutics

Keywords

  • Human
  • Mechanical stress
  • Mechanics
  • Tooth movement

ASJC Scopus subject areas

  • Orthodontics

Cite this

DeForest, W. N., Hentscher-Johnson, J. K., Liu, Y., Liu, H., Nickel, J., & Iwasakif, L. R. (2014). Human tooth movement by continuous high and low stresses. Angle Orthodontist, 84(1), 102-108. https://doi.org/10.2319/041113-277.1

Human tooth movement by continuous high and low stresses. / DeForest, Whitney N.; Hentscher-Johnson, Jodi K.; Liu, Ying; Liu, Hongzeng; Nickel, Jeffrey; Iwasakif, Laura R.

In: Angle Orthodontist, Vol. 84, No. 1, 01.01.2014, p. 102-108.

Research output: Contribution to journalArticle

DeForest, WN, Hentscher-Johnson, JK, Liu, Y, Liu, H, Nickel, J & Iwasakif, LR 2014, 'Human tooth movement by continuous high and low stresses', Angle Orthodontist, vol. 84, no. 1, pp. 102-108. https://doi.org/10.2319/041113-277.1
DeForest WN, Hentscher-Johnson JK, Liu Y, Liu H, Nickel J, Iwasakif LR. Human tooth movement by continuous high and low stresses. Angle Orthodontist. 2014 Jan 1;84(1):102-108. https://doi.org/10.2319/041113-277.1
DeForest, Whitney N. ; Hentscher-Johnson, Jodi K. ; Liu, Ying ; Liu, Hongzeng ; Nickel, Jeffrey ; Iwasakif, Laura R. / Human tooth movement by continuous high and low stresses. In: Angle Orthodontist. 2014 ; Vol. 84, No. 1. pp. 102-108.
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