In-vivo von Mises strains during Invisalign treatment

Introduction The Invisalign (Align Technology, Santa Clara, Calif) force delivery system has not been investigated. Since forces are related to the strains developed on the aligner surface, the behavior of the maxillary incisor and premolar von Mises strains (IVM, PVM) were studied during biweekly w...

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Bibliographic Details
Published in:American journal of orthodontics and dentofacial orthopedics 2010-10, Vol.138 (4), p.399-409
Main Authors: Vardimon, Alexander D, Robbins, Daniel, Brosh, Tamar
Format: Article
Language:English
Subjects:
Adolescent
Adult
Analysis of Variance
Bicuspid - physiology
Biological and medical sciences
Cohort Studies
Dental Stress Analysis
Dentistry
Female
Humans
Incisor - physiology
Male
Maxilla
Medical sciences
Orthodontic Anchorage Procedures
Orthodontic Appliance Design
Orthodontic Appliances, Removable
Otorhinolaryngology. Stomatology
Pain Measurement
Prospective Studies
Statistics, Nonparametric
Stress, Mechanical
Young Adult
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Summary:Introduction The Invisalign (Align Technology, Santa Clara, Calif) force delivery system has not been investigated. Since forces are related to the strains developed on the aligner surface, the behavior of the maxillary incisor and premolar von Mises strains (IVM, PVM) were studied during biweekly wear of an aligner. Methods Maxillary aligners (n = 61) were examined from 3 patients requiring maxillary incisor retraction and stationary anchored premolars. Two series of maxillary aligners were manufactured. Series 1 was worn by the patient, and series 2 served for in-vivo measurements with 2 strain gauge rosettes bonded to each aligner on the vestibular sides of the incisor and the premolar. Measurements were taken at days 1, 2, 9, and 15. Results All aligners demonstrated a peak IVM strain at day 1 ( P IVM). Conclusions Each aligner should be worn close to 24 hours in the first 2 days, with the time subsequently reduced (remaining 12 days). Final aligners should be thicker or worn for longer period (eg, 3 weeks). In spite of the inherent anchorage property of the aligner, attachment reinforcement should be considered in demanding anchorage requirements.
ISSN:0889-5406
1097-6752
DOI:10.1016/j.ajodo.2008.11.027