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A Novel Bi-dimensional Archwire for Miniscrew-supported En-masse Retraction

17. juni 2026 opdateret af: Damascus University

Preliminary Clinical Evaluation of a Novel Bi-dimensional Archwire During Miniscrew-Supported En-masse Retraction of the Maxillary Anterior Teeth

This study aims to provide a preliminary clinical evaluation of a novel bi-dimensional archwire used during miniscrew-supported en-masse retraction of the maxillary anterior teeth. Adult patients with Class II Division 1 malocclusion requiring extraction of the maxillary first premolars will be screened at the Department of Orthodontics, Faculty of Dentistry, Damascus University. Eligible participants will receive fixed orthodontic treatment followed by en-masse retraction using a custom-made laser-welded bi-dimensional stainless-steel archwire consisting of a 0.019 × 0.025-inch anterior segment and 0.016 × 0.022-inch posterior segments. Retraction will be supported by orthodontic miniscrews and nickel-titanium closed-coil springs. The main outcome will be the monthly rate of maxillary anterior retraction assessed on three-dimensional digital dental models. A secondary outcome will be the change in maxillary incisor torque assessed on lateral cephalometric radiographs. This pilot study is intended to generate preliminary clinical data regarding the feasibility and performance of this novel archwire design.

Studieoversigt

Status

Afsluttet

Betingelser

Intervention / Behandling

Detaljeret beskrivelse

This study was designed as a prospective single-arm pilot clinical trial to provide an initial clinical evaluation of a novel bi-dimensional archwire specifically developed for miniscrew-supported en-masse retraction of the maxillary anterior teeth. In adult orthodontic patients requiring extraction-based treatment, effective space closure depends not only on anchorage control, but also on the ability of the active retraction system to maintain acceptable control of the maxillary incisors during sliding mechanics. Conventional continuous rectangular stainless-steel archwires provide rigidity, but they may still be associated with frictional resistance, wire deformation, and incomplete torque control during retraction.

The archwire investigated in this study was newly developed as a single continuous stainless-steel assembly composed of a 0.019 × 0.025-inch anterior segment and 0.016 × 0.022-inch posterior segments joined by laser welding. The design was intended to combine greater anterior stiffness, to support better torque control of the maxillary incisors, with reduced posterior friction and binding during sliding mechanics. The intervention was applied under direct skeletal anchorage using self-drilling orthodontic miniscrews inserted bilaterally between the maxillary second premolars and first molars. Retraction was performed using nickel-titanium closed-coil springs delivering approximately 250 g of force per side.

Eligible participants were adult patients with skeletal Class II malocclusion and Class II Division 1 dental malocclusion who required extraction of the maxillary first premolars and en-masse retraction of the maxillary anterior teeth as part of their treatment plan. After leveling and alignment, the novel bi-dimensional archwire was inserted and the retraction phase was initiated. Participants were followed prospectively until completion of the en-masse retraction phase.

The primary outcome of the study was the monthly rate of maxillary anterior en-masse retraction assessed on three-dimensional digital dental models. The secondary outcome was the change in maxillary incisor torque measured on standardized lateral cephalometric radiographs using the bracket-archwire angle. This pilot trial was undertaken to determine whether this newly developed archwire could function as a clinically feasible biomechanical option and to generate preliminary outcome estimates for future randomized controlled trials.

Undersøgelsestype

Interventionel

Tilmelding (Faktiske)

6

Fase

  • Ikke anvendelig

Kontakter og lokationer

Dette afsnit indeholder kontaktoplysninger for dem, der udfører undersøgelsen, og oplysninger om, hvor denne undersøgelse udføres.

Studiesteder

      • Damascus, Syrien, DM20AM19
        • Department of Orthodontics, Faculty of Dentistry, University of Damascus

Deltagelseskriterier

Forskere leder efter personer, der passer til en bestemt beskrivelse, kaldet berettigelseskriterier. Nogle eksempler på disse kriterier er en persons generelle helbredstilstand eller tidligere behandlinger.

Berettigelseskriterier

Aldre berettiget til at studere

  • Voksen

Tager imod sunde frivillige

Ingen

Beskrivelse

Inclusion Criteria:

  • Adults aged 18-28 years with skeletal Class II malocclusion (ANB angle 5°-7°)
  • Class II Division 1 dental malocclusion according to Angle classification
  • An average or vertical facial growth pattern
  • A treatment plan requiring extraction of the maxillary first premolars
  • A need for maxillary anterior en-masse retraction
  • The presence of all permanent maxillary teeth except the third molars

Exclusion Criteria:

  • Patients with previous orthodontic treatment,
  • Craniofacial anomalies, systemic diseases affecting bone metabolism
  • Active periodontal disease
  • Poor oral hygiene
  • Missing maxillary permanent teeth, or were using
  • The use of medications known to influence bone metabolism

Studieplan

Dette afsnit indeholder detaljer om studieplanen, herunder hvordan undersøgelsen er designet, og hvad undersøgelsen måler.

Hvordan er undersøgelsen tilrettelagt?

Design detaljer

  • Primært formål: Behandling
  • Tildeling: N/A
  • Interventionel model: Enkelt gruppeopgave
  • Maskning: Ingen (Åben etiket)

Våben og indgreb

Deltagergruppe / Arm
Intervention / Behandling
Eksperimentel: Bi-dimensional archwire
Participants will be treated using a novel bi-dimensional stainless-steel archwire during miniscrew-supported en-masse retraction of the maxillary anterior teeth
The retraction procedure is going to be conducted using a bi-dimensional archwire which is a single continuous stainless-steel assembly composed of a 0.019 × 0.025-inch anterior segment and 0.016 × 0.022-inch posterior segments joined by laser welding.

Hvad måler undersøgelsen?

Primære resultatmål

Resultatmål
Foranstaltningsbeskrivelse
Tidsramme
Change in the monthly rate of maxillary anterior en-masse retraction
Tidsramme: Time 0: completion of leveling and alignment which happens within three months); Times 1, 2, 3, 4, 5 after one, two, three, four, and five months following the end of the leveling and alignment stage; Time Final: at the end of the retraction stage.
The amount of maxillary anterior retraction is assessed on three-dimensional digital dental models using the distance between the incisal edge of the maxillary central incisors and the medial point of the third palatal rugae as a stable intraoral reference. The monthly retraction rate is calculated in millimeters per month by dividing the amount of anterior retraction by the corresponding duration of the retraction interval.
Time 0: completion of leveling and alignment which happens within three months); Times 1, 2, 3, 4, 5 after one, two, three, four, and five months following the end of the leveling and alignment stage; Time Final: at the end of the retraction stage.

Sekundære resultatmål

Resultatmål
Foranstaltningsbeskrivelse
Tidsramme
Change in maxillary incisor torque
Tidsramme: Time 0: completion of leveling and alignment stage which is expected to occur within three months, and Time Final: completion of en-masse retraction stage which occurs within 9 - 10 months following the end of the leveling and alignment stage.
Maxillary incisor torque is assessed on standardized lateral cephalometric radiographs using the bracket-archwire angle. A tangent is drawn along the base of the maxillary central incisor bracket, and another tangent is drawn parallel to and superimposed on the working archwire. The obtuse angle formed between the two tangents is measured, and the actual torque value is calculated by subtracting 90° from this angle. The change in torque is determined by comparing the measurements recorded at T0 and T1.
Time 0: completion of leveling and alignment stage which is expected to occur within three months, and Time Final: completion of en-masse retraction stage which occurs within 9 - 10 months following the end of the leveling and alignment stage.

Samarbejdspartnere og efterforskere

Det er her, du vil finde personer og organisationer, der er involveret i denne undersøgelse.

Sponsor

Efterforskere

  • Ledende efterforsker: Abdulmalek M. H. Almasri, DDS, Damascus University

Publikationer og nyttige links

Den person, der er ansvarlig for at indtaste oplysninger om undersøgelsen, leverer frivilligt disse publikationer. Disse kan handle om alt relateret til undersøgelsen.

Datoer for undersøgelser

Disse datoer sporer fremskridtene for indsendelser af undersøgelsesrekord og resumeresultater til ClinicalTrials.gov. Studieregistreringer og rapporterede resultater gennemgås af National Library of Medicine (NLM) for at sikre, at de opfylder specifikke kvalitetskontrolstandarder, før de offentliggøres på den offentlige hjemmeside.

Studer store datoer

Studiestart (Faktiske)

1. juli 2025

Primær færdiggørelse (Faktiske)

27. april 2026

Studieafslutning (Faktiske)

1. maj 2026

Datoer for studieregistrering

Først indsendt

13. juni 2026

Først indsendt, der opfyldte QC-kriterier

17. juni 2026

Først opslået (Faktiske)

24. juni 2026

Opdateringer af undersøgelsesjournaler

Sidste opdatering sendt (Faktiske)

24. juni 2026

Sidste opdatering indsendt, der opfyldte kvalitetskontrolkriterier

17. juni 2026

Sidst verificeret

1. juni 2026

Mere information

Begreber relateret til denne undersøgelse

Andre undersøgelses-id-numre

  • UDDS-2026-Ortho-4

Plan for individuelle deltagerdata (IPD)

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