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  • Online Resource  (6)
  • Lapatki, Bernd G.  (6)
  • 2020-2024  (6)
  • 1
    Online Resource
    Online Resource
    Are aligners capable of inducing palatal bodily translation or palatal root torque of upper central incisors? A biomechanical in vitro study
    Springer Science and Business Media LLC ; 2023
    In:  Clinical Oral Investigations Vol. 27, No. 8 ( 2023-05-27), p. 4289-4300
    Details
    In: Clinical Oral Investigations, Springer Science and Business Media LLC, Vol. 27, No. 8 ( 2023-05-27), p. 4289-4300
    Abstract: Previous studies have shown that aligners have limited ability to control root movements. The purpose of this study was to investigate which modification geometry and foil thickness are optimal for generating the force-moment (F/M) systems required for palatal root torque of maxillary central incisors. Materials and methods Tooth 11 was separated from a maxillary acrylic model and connected to a movement unit via a 3D F/M sensor. Different modification geometries (crescent, capsular, double-spherical) with different depths were digitally implemented in the labio-cervical region of tooth 11 to induce an increased contact force. We evaluated the F/M systems exerted by aligners with thicknesses of 0.4–1.0 mm. F/M measurements were taken with tooth 11 in the neutral position and during palatal displacement of tooth 11 (simulating its initial clinical movement). Results The mechanical requirements of palatal root torque are a palatally directed force (− Fy) and a palatal root torquing moment (− Mx). These requirements were reliably achieved with modification depths  〉  0.5 mm. The modification depth and foil thickness had a significant influence on − Fy magnitudes (linear mixed-effect models, p   〈  0.01). With the 0.75-mm aligners combined with 1.5-mm deep modifications, the palatal root torque range (palTR) started after an initial palatal crown displacement of 0.09, 0.12, and 0.12 mm for the capsular, crescent, and double-spherical modification geometries, respectively. Conclusions A relatively early start of the palatal torque range (after a 0.1-mm palatal crown displacement) and appropriate − Fy magnitudes were achieved with 0.75-mm-thick aligners containing 1.5-mm deep capsular or crescent pressure regions. Subsequent clinical trials are required to confirm the clinical effects of these modifications. Clinical relevance In vitro testing indicated that modified aligners are capable of generating the F/M components required for palatal root torque of upper central incisors.
    Type of Medium: Online Resource
    ISSN: 1436-3771
    URL: Article
    DOI: 10.1007/s00784-023-05046-7
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 2023
    detail.hit.zdb_id: 1472578-2
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  • 2
    Online Resource
    Online Resource
    Mechanical loads exerted by different configurations of Burstone’s 3-piece segmented mechanics during a simulated intrusion of the mandibular incisors
    Elsevier BV ; 2023
    In:  American Journal of Orthodontics and Dentofacial Orthopedics Vol. 164, No. 1 ( 2023-07), p. 106-115
    Details
    In: American Journal of Orthodontics and Dentofacial Orthopedics, Elsevier BV, Vol. 164, No. 1 ( 2023-07), p. 106-115
    Type of Medium: Online Resource
    ISSN: 0889-5406
    URL: Article
    DOI: 10.1016/j.ajodo.2022.11.014
    Language: English
    Publisher: Elsevier BV
    Publication Date: 2023
    detail.hit.zdb_id: 2021368-2
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  • 3
    Online Resource
    Online Resource
    Experimental and numerical evaluation of simulated dental arch expansion during orthodontic therapy
    Walter de Gruyter GmbH ; 2022
    In:  Current Directions in Biomedical Engineering Vol. 8, No. 1 ( 2022-07-01), p. 85-88
    Details
    In: Current Directions in Biomedical Engineering, Walter de Gruyter GmbH, Vol. 8, No. 1 ( 2022-07-01), p. 85-88
    Abstract: In this publication, methods are presented to improve predictions of perioral soft-tissue changes following the expansion of the dental arches during orthodontic therapy. Acrylic veneers with different thicknesses were reversibly attached to the buccal surfaces of the upper and lower incisors to simulate their protrusion. The resulting morphological changes of the perioral soft-tissue surface were determined by 3D face scans. Experimentally-determined 3D soft-tissue changes are compared to numerical predictions using detailed finite-element (FE) models of the face of two individuals differing in the body mass index (BMI). The results suggest that common estimates of material constants used by the detailed and individualized FE models might be sufficient to explain absolute soft-tissue displacements although differences occurred between experimental and modeling results regarding the directions of displacements. The aim of this investigation is to create predictions of post-treatment appearance that are helpful for therapy planning.
    Type of Medium: Online Resource
    ISSN: 2364-5504
    URL: Article
    DOI: 10.1515/cdbme-2022-0022
    Language: English
    Publisher: Walter de Gruyter GmbH
    Publication Date: 2022
    detail.hit.zdb_id: 2835398-5
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  • 4
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    Online Resource
    Effects of preventing intercuspation on the precision of jaw movements
    Wiley ; 2021
    In:  Journal of Oral Rehabilitation Vol. 48, No. 4 ( 2021-04), p. 392-402
    Details
    In: Journal of Oral Rehabilitation, Wiley, Vol. 48, No. 4 ( 2021-04), p. 392-402
    Abstract: Closing movements are among the jaw’s basic physiological motor actions. During functional movements, the jaw changes position continually, which requires appropriate proprioception. However, the significance of the various proprioceptive receptors involved and how they interact is not yet fully clear. Objectives This study’s main objective was to test whether preventing intercuspation (IC) for 1 week would affect the precision of jaw‐closing movements into IC and the functional space of habitual chewing movements (HCM). A secondary objective was to compare precision of jaw‐closing movements into IC with the precision of movements into a target position (TP) far from IC. Methods Fourteen participants’ HCM and jaw‐closing movements into IC were recorded on two sessions (T1 and T2) 1 week apart. Between sessions, participants wore posterior bite plates to prevent IC. They also received a 10‐minute training session at T1 to guide their jaw‐closing movements into TP. The precision of the closing movements into IC and TP was analysed. For HCM, the vertical amplitude, lateral width and area of chewing cycles were evaluated. Results The precision of jaw movements into IC increased as the jaw gap decreased, but precision did not differ significantly between T1 and T2. For HCM, the vertical amplitude and area of chewing cycles increased significantly between T1 and T2. The precision of the closing trajectory into TP increased significantly during the training session. Conclusion Our results confirm the excellent adaptability of the craniomandibular system, controlled by stringent motor programmes that are supported by continuous peripheral sensory input.
    Type of Medium: Online Resource
    ISSN: 0305-182X , 1365-2842
    URL: Issue
    URL: Article
    DOI: 10.1111/joor.v48.4
    DOI: 10.1111/joor.13137
    Language: English
    Publisher: Wiley
    Publication Date: 2021
    detail.hit.zdb_id: 2007587-X
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  • 5
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    Online Resource
    Nicht beabsichtigte Nebenwirkungen festsitzender Retainerdrähte : Eine In-vitro-Untersuchung
    Springer Science and Business Media LLC ; 2022
    In:  Journal of Orofacial Orthopedics / Fortschritte der Kieferorthopädie
    Details
    In: Journal of Orofacial Orthopedics / Fortschritte der Kieferorthopädie, Springer Science and Business Media LLC
    Abstract: Um Nebenwirkungen festsitzender Lingualretainer besser zu verstehen, wurde eine In-vitro-Studie an einem Zweizahnmodell durchgeführt, bei der die dreidimensionalen (3-D) Kraft-Moment-Komponenten bestimmt wurden, die auf aneinandergrenzende Zähne in Kombination mit verschiedenen Komposit-Draht-Grenzflächen wirken. Methoden Dreifach verseilte runde Retainerdrähte wurden in ausgehärtete Scheiben aus fließfähigem Komposit eingebettet. Auf der einen Seite wurde die Komposit-Draht-Grenzfläche unbearbeitet belassen und auf absolute Festigkeit geprüft. Auf der anderen Seite wurde die Komposit-Draht-Grenzfläche entweder mit (1) Petrolatum isoliert oder als feste Verbindung (2) ohne weitere Bearbeitung, (3) mit Ethanol-Reinigung oder (4) mit Ethanol-Reinigung und rechtwinkligem Umbiegen der Drahtenden gestaltet. Die Kraft-Moment-Komponenten wurden dreidimensional erfasst, während der Zwischenzahnabstand in Schritten von 0,01 mm vergrößert wurde, was zu einer zunehmenden Spannung des Drahtes führte. Die Messungen wurden nach einer künstlichen Alterung der Proben wiederholt. Ergebnisse Drähte mit festem Kunststoffhaftverbund (2, 3 und 4) zeigten negative Drehmomente in vestibulooraler Richtung mit Maximalwerten zwischen −0,3 und −0,9 Nmm. Proben mit gelöstem Verbund (1) zeigten ein entgegengesetztes positives Drehmoment mit Maximalwerten von 1,9 Nmm. Relevante „tipping moments“ traten in der Gruppe mit isoliertem Verbund bei geringeren Kräften auf als in den Gruppen mit adhärentem Verbund. Vergleichbare Effekte wurden an künstlich gealterten Probenkörpern beobachtet. Schlussfolgerung Nebenwirkungen treten unter spezifischen Bedingungen, wie eine veränderte Haftverbindung in Kombination mit dem Einwirken von oralen Kräften, auf. Verbindungen mit gelöstem Haftverbund an der Grenzfläche zwischen Komposit und Draht zeigten Drehmomente in Richtung der Drahtwindungen. Dies war selbst bei geringen Zugkräften, ähnlich denen, die in klinischen Situationen entstehen können, zu beobachten. Umgekehrte Drehmomente, die zu einem Entwinden des Drahtes führen, können bei fester Verbindung und höheren Zugkräften auftreten. Die Verwendung von runden, dreifach verseilten Retainerdrähten ohne umgebogene Enden stellen ein erhöhtes Risiko für das Auftreten von nicht beabsichtigten Nebenwirkungen dar.
    Type of Medium: Online Resource
    ISSN: 1434-5293 , 1615-6714
    URL: Article
    DOI: 10.1007/s00056-022-00432-4
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 2022
    detail.hit.zdb_id: 2023540-9
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  • 6
    Online Resource
    Online Resource
    Evaluation of orthodontic loads and wire–bracket contact configurations in a three-bracket setup: Comparison of in-vitro experiments with numerical simulations
    Elsevier BV ; 2021
    In:  Journal of Biomechanics Vol. 121 ( 2021-05), p. 110401-
    Details
    In: Journal of Biomechanics, Elsevier BV, Vol. 121 ( 2021-05), p. 110401-
    Type of Medium: Online Resource
    ISSN: 0021-9290
    URL: Article
    DOI: 10.1016/j.jbiomech.2021.110401
    RVK:
    WA 15000
    Language: English
    Publisher: Elsevier BV
    Publication Date: 2021
    detail.hit.zdb_id: 1498351-5
    SSG: 12
    SSG: 31
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