Comparison of Clear Aligner Treatment in First-Treatment and Re-Treatment Patients: A Retrospective Cohort Study

Timm, Lan Huong; Rößler, Ralf; Baxmann, Martin

doi:10.3390/app13074303

Cited by 5 publications

(3 citation statements)

References 26 publications

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“…This suggests that a treatment plan incorporating both approaches can optimize their respective advantages in managing certain malocclusions [ 6 , 9 , 15 ]. Orthodontists’ reports of the need to refine and complete CAT cases with fixed appliances may suggest a limitation in the DTP software to estimate individual tooth movements and treatment outcomes precisely [ 9 , 16 ].…”

Section: Discussionmentioning

confidence: 99%

Clear aligner therapy practices among orthodontists practicing in Canada

Miranda e Paulo,

Moreira-Santos,

Tavares

et al. 2024

Prog Orthod.

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Background The acceptability and preference for clear aligner therapy (CAT) has been increasing among orthodontists, but there is still a lack of consensus regarding CAT best practices. Consequently, this study aimed to investigate CAT practices among orthodontists practicing in Canada. Methods The survey was conducted among orthodontists practicing in Canada using a modified previously published survey. Sixty orthodontists participated (6.1% response rate). It consisted of 11 sections with open and closed questions related to demographic information and particularities about using or not using CAT. The survey responses were exported from REDCap to a Microsoft Excel (Microsoft, Redmond, Wash) spreadsheet, then statistically analyzed using SPSS software (SPSS for Windows, version 21.0; IBM Inc., Armonk, NY, USA). The comments were categorized under themes and subthemes. Data were organized in descriptive statistics, expressing frequencies and percentages. Results Almost 30% of the orthodontist’s annual caseload was treated with CAT, most frequently prescribed to adult patients. Case complexity and patient cooperation were the factors that most influenced the decision to prescribe CAT. Almost half of orthodontists reported sometimes combining CAT with adjunctive fixed appliances. Conclusions Most orthodontists prescribe CAT, and its use is based on the malocclusion’s complexity. Orthodontists who do not prescribe CAT believe that fixed appliance therapy has superior treatment outcomes.

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Section: Discussionmentioning

confidence: 99%

Clear aligner therapy practices among orthodontists practicing in Canada

Miranda e Paulo,

Moreira-Santos,

Tavares

et al. 2024

Prog Orthod.

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“…Additionally, they underwent initial and continuous training through the Clear Aligner Academy program. This program ensures that all practitioners are equipped to handle a range of cases, from simple to moderately complex clear aligner therapy (CAT), and to conduct standardized clinical examinations for appropriate case selection within the treatment scope [20]. The treatment protocol employed a series of custom-designed aligners tailored to the complexity of each case.…”

Section: Setting Participants and Sample Sizementioning

confidence: 99%

Predicting Outcome in Clear Aligner Treatment: A Machine Learning Analysis

Wolf,

Farrag,

Flügge

et al. 2024

JCM

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Background/Objectives: Machine learning (ML) models predicting the risk of refinement (i.e., a subsequent course of treatment being necessary) in clear aligner therapy (CAT) were developed and evaluated. Methods: An anonymized sample of 9942 CAT patients (70.6% females, 29.4% males, age range 18–64 years, median 30.5 years), as provided by DrSmile, a large European CAT provider based in Berlin, Germany, was used. Three different ML methods were employed: (1) logistic regression with L1 regularization, (2) extreme gradient boosting (XGBoost), and (3) support vector classification with a radial basis function kernel. In total, 74 factors were selected as predictors for these methods and are consistent with clinical reasoning. Results: On a held-out test set with a true-positive rate of 0.58, the logistic regression model has an area under the ROC curve (AUC) of 0.67, an average precision (AP) of 0.73, and Brier loss of 0.22; the XGBoost model has an AUC of 0.67, an AP of 0.74, and Brier loss of 0.22; and the support vector model has a recall of 0.61 and a precision of 0.64. The logistic regression and XGBoost models identify predictors influencing refinement risk, including patient compliance, interproximal enamel reduction (IPR) and certain planned tooth movements, for example, lingual translation of maxillary incisors being associated with the lowest risk of refinement and rotation of mandibular incisors with the highest risk. Conclusions: These findings suggest moderate, well-calibrated predictive accuracy with both regularized logistic regression and XGBoost and underscore the influence the identified factors have on the risk of refinement in CAT, emphasizing their importance in the careful planning of orthodontic treatment and the potential for shorter treatment times, less patient discomfort, and fewer clinic visits. Identification of at-risk individuals could support tailored clinical decision-making and enable targeted interventions

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“…Previous studies on thermoformed aligners have extensively explored their resistance to staining, attributing their color stability to material properties and manufacturing processes [ 16 , 17 ]. Research has shown that thermoformed aligners retain their color when exposed to common dietary agents such as coffee, tea, and wine, primarily due to the surface characteristics and the chemical composition of the polyurethane material used [ 18 ].…”

Section: Introductionmentioning

confidence: 99%

Color and Chemical Stability of 3D-Printed and Thermoformed Polyurethane-Based Aligners

Šimunović,

Čekalović Agović,

Marić

et al. 2024

Polymers

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The significant rise in the use of clear aligners for orthodontic treatment is attributed to their aesthetic appeal, enhancing patient appearance and self-confidence. The aim of this study is to evaluate the aligners’ response to common staining agents (coffee, black tea, Coca-Cola, and Red Bull) in color and chemical stability. Polyurethane-based thermoformed and 3D-printed aligners from four brands were exposed to common beverages to assess color change using a VITA Easyshade compact colorimeter after 24 h, 48 h, 72 h, and 7 days, as well as chemical stability using ATR-FTIR spectroscopy. The brand, beverage, and manufacturing method significantly influence color stability. ATR-FTIR analysis revealed compositional differences, with variations in response to beverage exposure affecting the integrity of polymer bonds. Color change analysis showed coffee as the most potent staining agent, particularly affecting Tera Harz TC85 aligners, while ClearCorrect aligners exhibited the least susceptibility. 3D-printed aligners showed a greater color change compared to thermoformed ones. Aligners with a PETG outer layer are more resistant to stains and chemical alterations than those made of polyurethane. Additionally, 3D-printed polyurethane aligners stain more than thermoformed ones. Therefore, PETG-layered aligners are a more reliable choice for maintaining the aesthetic integrity of aligners.

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Comparison of Clear Aligner Treatment in First-Treatment and Re-Treatment Patients: A Retrospective Cohort Study

Cited by 5 publications

References 26 publications

Clear aligner therapy practices among orthodontists practicing in Canada

Clear aligner therapy practices among orthodontists practicing in Canada

Predicting Outcome in Clear Aligner Treatment: A Machine Learning Analysis

Color and Chemical Stability of 3D-Printed and Thermoformed Polyurethane-Based Aligners

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