In Vitro and In Vivo Performance of the Leaf Expander®: Agreement Between Laboratory Testing and Clinical Expansion
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Le résumé fourni par la source
(1) Background: Posterior crossbite associated with maxillary transverse deficiency is commonly managed with maxillary expansion, yet the correspondence between laboratory activation behavior and the clinical response of nickel–titanium leaf-spring expanders remains insufficiently defined; therefore, this study aimed to compare in vitro and in vivo performance of the Leaf Expander® and to assess their agreement. (2) Methods: A retrospective sample of 15 mixed-dentition patients (7–10 years) treated at two university centers with a Leaf Expander® (6 mm screw; 900 g) was evaluated; interpremolar (E–E), intermolar (6–6), and intercanine (C–C) distances were recorded at baseline (T0, digital models) and at follow-up visits (T1–T5, caliper measurements), while mechanical compression testing (Instron 3365) quantified force release across the activation sequence; normality (Shapiro–Wilk), parametric analyses, and Pearson correlation were used. (3) Results Posterior crossbite correction was achieved in all completed cases, with mean total increases (T0–T5) of 5.4 mm (E–E), 4.4 mm (6–6), and 6.0 mm (C–C); early expansion (T1–T0) averaged 2.5 mm at E–E, and laboratory curves showed an activation peak followed by sustained force release (~6.5–9 N) and a residual-load phase. Agreement between declared activation and clinical response was higher for E–E and 6–6 than for C–C, which showed greater variability. (4) Conclusions: These findings support the Leaf Expander® as an effective compliance-free slow expansion device and indicate that laboratory force behavior can help interpret the clinical expansion timeline, including delayed expression after activation.
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Le contrôle bibliographique ouvert
DOI retrouvé dans Crossref DOI retrouvé ; titre concordant.
- Titre Crossref
- In Vitro and In Vivo Performance of the Leaf Expander®: Agreement Between Laboratory Testing and Clinical Expansion
- Date Crossref
- 29/04/2026
- Éditeur
- MDPI AG
- Type
- journal-article
Ce recoupement confirme des métadonnées liées au DOI. Il ne confirme ni la méthode ni les conclusions de l’étude, et il ne compte pas comme une seconde source scientifique indépendante.
Où se fait cette recherche
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University of Genoa pays non établi dans la noticeUniversité ou école supérieure
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University of Modena and Reggio Emilia Medical and Dental Department pays non établi dans la noticeUniversité ou école supérieure
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University of Milan pays non établi dans la noticeUniversité ou école supérieure
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Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico Fondazione IRCCS Cà Granda pays non établi dans la noticeÉtablissement de santé
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University of Genova Department of Sciences Integrated Surgical and Diagnostic pays non établi dans la noticeUniversité ou école supérieure
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School of Dentistry Department of Biomedical pays non établi dans la noticeUniversité ou école supérieure
University of Genoa, Medical and Dental Department — University of Modena and Reggio Emilia et University of Milan, avec 3 autres affiliations.
Une affiliation ne permet pas de déduire la nationalité d’un auteur.