How well does Invisalign work? A prospective clinical study evaluating the efficacy of tooth movement with Invisalign

Objectives: To investigate the predictability of arch expansion using Invisalign. Materials and Methods: Sixty-four adult white patients were selected to be part of this retrospective study. Pre-and posttreatment digital models created from an iTero scan were obtained from a single orthodontist practitioner. Digital models from Clincheck were also obtained from Align Technology. Linear values of upper and lower arch widths were measured for canines, premolars, and first molars at two different points: lingual gingival margins and cusp tips. A paired ttest was used to compare expansion planned on Clincheck with the posttreatment measurements. Variance ratio tests were used to determine if a larger change planned was associated with larger error.

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“…The level of significance was set at 5%. The amount of change achieved was also calculated in percentage 10 :…”

Section: Methodsmentioning

confidence: 99%

“…9 In a prospective clinical study by Kravitz et al 10 in 2009, the mean accuracy of tooth movement in the anterior region was found to be 41% with Invisalign. An internal study from Align Technology found that one should expect about 80% of tooth movement seen on Clincheck.…”

Section: Introductionmentioning

confidence: 99%

The predictability of transverse changes with Invisalign

Houle

Piedade

Todescan

et al. 2016

The Angle Orthodontist

132

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“…This orthodontic treatment modality, the most renowned of which is Invisalign, becomes more and more attractive than traditional fixed appliances because it offers a number of advantages including less pain, fewer office visits, virtually transparent, and can be removed for eating and brushing 7) . Despite being increasingly accepted by patients, the mechanical properties and tooth-moving process of orthodontic thermoplastic appliances remains unclear 8,9) .…”

Section: Introductionmentioning

confidence: 99%

Dynamic stress relaxation of orthodontic thermoplastic materials in a simulated oral environment

et al. 2013

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Mechanical properties are crucial for screening orthodontic thermoplastic materials for invisible aligners. However, most of previous studies were carried out within laboratory conditions which limit our understanding of the mechanical behaviors of aligners within oral environment. In this study, we studied the dynamic stress relaxation of thermoplastic materials by combination of Bose ElectroForce and a homemade temperature-controlled water bath. The 3-h stress relaxation curves of five orthodontic thermoplastic materials were measured within 37°C water bath as well as comparatively in ambient atmospheric environment (~20°C). The percentage residual stress at 0, 30, 60, 90, 120, 150, and 180 min was selected for statistical analyses. As expected, the experimental results showed that the residual stress within all five materials decreased with time, and that this process was significantly accelerated in the 37°C water bath (p<0.05). Compared with other materials, Erkodur and Masel exhibited slower relaxing rates in the 37°C water bath (p<0.05).

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“…However, orthodontists reported that 70% to 80% of their patients required midcourse correction, case refinement, or conversion to fixed appliances before the end of treatment 5,6) . Efficacy of tooth movement with clear thermoplastic appliances was also lower than with fixed appliances 7) . These lackluster clinical results clearly showed that the application of thermoplastic materials for orthodontic tooth movement requires a sufficient understanding of the material characteristics, optimal material selection, and design.…”

Section: Introductionmentioning

confidence: 99%

Preparation and characterization of thermoplastic materials for invisible orthodontics

Zhang

Bai

Ding

et al. 2011

Dental Materials Journal

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PETG/PC/TPU polymer blend was prepared by mechanical blending. The mechanical properties of modified PETG/PC/TPU blend were characterized using a universal testing machine, and results were compared against two commercial thermoplastic products -Erkodur and Biolon. Blending modification improved the properties of PETG/PC/TPU. When blending ratio (wt%) was 70/10/20, PETG/PC/TPU exhibited optimal mechanical properties which exceeded those of Erkodur and Biolon. Tear strength was 50.23 MPa and elongation at break was 155.99%. Stress relaxation rate was 0.0136 N/s after 1 hour, which was significantly slower than Erkodur and Biolon (p<0.05). Water absorption rate was 0.57% after 2 weeks, which was significantly lower than Erkodur and Biolon (p<0.05).

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How well does Invisalign work? A prospective clinical study evaluating the efficacy of tooth movement with Invisalign

Cited by 463 publications

References 10 publications

The predictability of transverse changes with Invisalign

The predictability of transverse changes with Invisalign

Dynamic stress relaxation of orthodontic thermoplastic materials in a simulated oral environment

Preparation and characterization of thermoplastic materials for invisible orthodontics

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