Journal article
Sixteen-week analysis of unaltered elastomeric chain relating in-vitro force degradation with in-vivo extraction space tooth movement
American journal of orthodontics and dentofacial orthopedics, Vol.151(4), pp.727-734
04/01/2017
DOI: 10.1016/j.ajodo.2016.10.020
PMID: 28364896
Abstract
The purposes of this study were to evaluate whether unaltered elastomeric chain can continue to move teeth for 16 weeks and to relate it to the amount of force remaining for the same batch of elastomeric chains.
The in-vivo portion of the study had a sample of 30 paired extraction space sites from 22 subjects who were measured for closure of the space every 28 days. The altered side elastomeric chain served as the control and was replaced at 28-day intervals whereas the experimental side remained unaltered. In the in-vitro portion of the study, 100 each of 2-unit and 3-unit segments of the same batch of elastomeric chains were placed in a water bath, and the force was measured for 20 of each segment length at the 28-day measurement points.
Statistically significant amounts of space closure occurred at both the altered and unaltered sites at all measurement time points. The mean space closure at the altered sites was minimally greater than that observed at the paired unaltered sites. The mean differences of space closure between the altered and unaltered sites ranged from a minimum of –0.05 mm at 4 weeks to a maximum of –0.14 mm at 8 weeks. The elastomeric chain force degraded rapidly by 4 weeks but continued a gradual diminution of force to 86 g at 16 weeks.
Unaltered elastomeric chain continued to move teeth into extraction spaces for 16 weeks in this sample from both statistically and clinically significant standpoints. There were minimal and statistically insignificant differences in the mean space closure measurements between the paired altered and unaltered sites. The elastomeric chain force at 16 weeks was less than 100 g, yet at the same time point, teeth continued to move clinically.
•Elastomeric chains can continue to move teeth for a minimum of 16 weeks.•Elastomeric chain measured in vitro demonstrated diminishing force to a mean of 86 g at 16 weeks.•Use of a practice-based network of clinicians is a promising approach for clinical research.
Details
- Title: Subtitle
- Sixteen-week analysis of unaltered elastomeric chain relating in-vitro force degradation with in-vivo extraction space tooth movement
- Creators
- Kristin S. Evans - Private practice, Dallas, TexCory M. Wood - Private practice, Nashville, TennAllen H. Moffitt - Division of Orthodontics, Vanderbilt University Medical Center, Nashville, TennJohn A. Colgan - Network clinician, Paducah, KyJ. Kevin Holman - Network clinician, Tupelo, MissSteven D. Marshall - University of Iowa, OrthodonticsD. Spencer Pope - Network clinician, Flossmoor, IllLew B. Sample - Network clinician, Decatur, AlaStephen L. Sherman - Network clinician, Baton Rouge, LaPeter M. Sinclair - Network clinician, Torrance, CalifTim S. Trulove - Network clinician, Montgomery, Ala
- Resource Type
- Journal article
- Publication Details
- American journal of orthodontics and dentofacial orthopedics, Vol.151(4), pp.727-734
- Publisher
- Elsevier Inc
- DOI
- 10.1016/j.ajodo.2016.10.020
- PMID
- 28364896
- ISSN
- 0889-5406
- eISSN
- 1097-6752
- Language
- English
- Date published
- 04/01/2017
- Academic Unit
- Orthodontics
- Record Identifier
- 9984558246702771
Metrics
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