- ICH GCP
- Rejestr badań klinicznych w USA
- Badanie kliniczne NCT07708363
Bracket Positioning Techniques and Quality of Orthodontic Finishing
Comparison of Three Bracket Positioning Techniques (Smile Arc Protection, Smile Arc and Marginal Ridge Approach, and McLaughlin-Bennett-Trevisi) on the Quality of Orthodontic Finishing, Mini-Esthetics, and Anterior Tooth Tip and Torque: A Three-Arm Randomized Clinical Trial
Przegląd badań
Status
Szczegółowy opis
Bracket positioning is one of the most influential operator-dependent factors affecting the quality of orthodontic finishing and the resulting smile esthetics. Three contemporary positioning philosophies are compared in this trial.
Design. Eligible participants are randomly allocated 1:1:1 to one of three parallel arms. Allocation is generated with an online randomizer, concealed in sequentially opaque sealed envelopes held by a co-supervisor, and revealed only on the day of intervention. Outcome assessors are blinded; operator blinding is not feasible.
Intervention. All arms receive a fully digital indirect-bonding workflow (intraoral scanning, virtual bracket placement in 3Shape Ortho-Analyzer, 3D-printed casts, vacuum-formed transfer trays) using a 0.018-inch MBT prescription, and an identical arch wire sequence ending in a 0.017 in × 0.025 in stainless steel wire maintained for three months. The arms differ only in the vertical/angular bracket-positioning rule applied (SAP, SAMRA, or MBT chart).
Assessment. Records are captured before bonding (T₀) and at the end of levelling and alignment (T₁). The ABO-OGS is scored on 3D-printed casts and the panoramic radiograph; tip and torque are measured on dentoalveolar CBCT; mini-esthetic parameters are measured on standardized frontal posed-smile photographs calibrated in Adobe Photoshop.
Typ studiów
Zapisy (Rzeczywisty)
Faza
- Nie dotyczy
Kontakty i lokalizacje
Lokalizacje studiów
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Cairo Governorate
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New Cairo, Cairo Governorate, Egipt, 11835
- Department of Orthodontics, Faculty of Oral and Dental Medicine, Future University in Egypt, Cairo, Egypt
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Kryteria uczestnictwa
Kryteria kwalifikacji
Wiek uprawniający do nauki
- Dziecko
- Dorosły
Akceptuje zdrowych ochotników
Opis
Inclusion Criteria:
- Males and females aged 14-25 years with a full permanent dentition.
- Mild to moderate crowding requiring non-extraction orthodontic treatment (2-6 mm per Graber's classification).
- Angle Class I malocclusion.
- Normal skeletal vertical dimension (SN-MP angle 32° ± 5°).
Exclusion Criteria:
1. Medication that may cause gingival inflammation (e.g., cyclosporine, phenytoin).
2. Impacted, extracted, or missing permanent teeth (except third molars). 3. Periodontal disease or parafunctional habits (bruxism, tongue thrusting, mouth breathing).
4. History of previous orthodontic treatment. 5. Craniofacial anomalies, facial asymmetry, or skeletal discrepancy.
Plan studiów
Jak projektuje się badanie?
Szczegóły projektu
- Główny cel: Leczenie
- Przydział: Randomizowane
- Model interwencyjny: Przydział równoległy
- Maskowanie: Pojedynczy
Broń i interwencje
Grupa uczestników / Arm |
Interwencja / Leczenie |
|---|---|
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Eksperymentalny: Group SAP
Bracket positioning by the Smile Arc Protection technique (anterior brackets placed relatively more gingival, referenced to canine crown height).
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Bracket positioning by the Smile Arc Protection technique (anterior brackets placed relatively more gingival, referenced to canine crown height).
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Eksperymentalny: Group SAMRA
Bracket positioning by the Smile Arc and Marginal Ridge Approach (digital workflow referencing the marginal-ridge line and facial axis).
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Bracket positioning by the Smile Arc and Marginal Ridge Approach (digital workflow referencing the marginal-ridge line and facial axis).
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Aktywny komparator: Group MBT (Control)
Bracket positioning by the McLaughlin-Bennett-Trevisi bracket placement chart (bracket-to-incisal-edge distances from the standardized chart).
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Bracket positioning by the McLaughlin-Bennett-Trevisi bracket placement chart (bracket-to-incisal-edge distances from the standardized chart).
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Co mierzy badanie?
Podstawowe miary wyniku
Miara wyniku |
Opis środka |
Ramy czasowe |
|---|---|---|
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Quality of orthodontic finishing - ABO Objective Grading System (ABO-OGS) total score
Ramy czasowe: At completion of the levelling and alignment phase (T₁), after the 0.017 in × 0.025 in stainless steel arch wire has been maintained for 3 months - approximately 7 months after bonding.
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Total ABO-OGS score obtained on the Cast-Radiographic Evaluation (CRE) form.
Seven parameters - alignment/rotations, marginal ridges, buccolingual inclination, occlusal contacts, occlusal relationships, overjet, and interproximal contacts - are scored on 3D-printed casts with the ABO measuring gauge; root angulation is scored on the panoramic radiograph.
Point deductions are summed to give the total score (a lower total indicates better finishing).
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At completion of the levelling and alignment phase (T₁), after the 0.017 in × 0.025 in stainless steel arch wire has been maintained for 3 months - approximately 7 months after bonding.
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Miary wyników drugorzędnych
Miara wyniku |
Opis środka |
Ramy czasowe |
|---|---|---|
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Anterior crown angulation (tip) - CBCT
Ramy czasowe: Change from before bonding (T₀) to end of levelling and alignment (T₁), approximately 7 months after bonding
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Change in mesiodistal crown angulation (tip) of the anterior teeth, measured in degrees on dentoalveolar CBCT using defined landmarks and reference planes.
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Change from before bonding (T₀) to end of levelling and alignment (T₁), approximately 7 months after bonding
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Anterior crown inclination (torque) - CBCT
Ramy czasowe: Change from before bonding (T₀) to end of levelling and alignment (T₁), approximately 7 months after bonding
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Change in labiolingual crown inclination (torque) of the anterior teeth, measured in degrees on dentoalveolar CBCT.
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Change from before bonding (T₀) to end of levelling and alignment (T₁), approximately 7 months after bonding
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Maxillary gingival display
Ramy czasowe: Change from before bonding (T₀) to end of levelling and alignment (T₁), approximately 7 months after bonding
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Change in maxillary gingival display - the vertical distance (mm) between the inferior border of the upper lip and the gingival zenith of each maxillary anterior tooth (central incisor, lateral incisor, canine, both sides) on standardized posed-smile frontal photographs, measured in Adobe Photoshop after calibration against a metric ruler.
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Change from before bonding (T₀) to end of levelling and alignment (T₁), approximately 7 months after bonding
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Maxillary incisal display
Ramy czasowe: Change from before bonding (T₀) to end of levelling and alignment (T₁), approximately 7 months after bonding
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Change in maxillary incisal display - the vertical amount (mm) of maxillary incisor crown visible relative to the upper lip during a posed smile, on standardized photographs.
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Change from before bonding (T₀) to end of levelling and alignment (T₁), approximately 7 months after bonding
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Buccal corridor width
Ramy czasowe: Change from before bonding (T₀) to end of levelling and alignment (T₁), approximately 7 months after bonding
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Change in buccal corridor (lateral negative space) - the linear distance (mm) between the most posterior visible maxillary tooth and the corner of the mouth during posed smile, measured on each side and averaged.
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Change from before bonding (T₀) to end of levelling and alignment (T₁), approximately 7 months after bonding
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Smile arc category
Ramy czasowe: Change from before bonding (T₀) to end of levelling and alignment (T₁), approximately 7 months after bonding
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Smile arc classified as consonant, flat, or reversed based on the relationship between the curvature of the maxillary incisal/canine/premolar edges and the curvature of the lower lip during posed smile.
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Change from before bonding (T₀) to end of levelling and alignment (T₁), approximately 7 months after bonding
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Współpracownicy i badacze
Sponsor
Daty zapisu na studia
Główne daty studiów
Rozpoczęcie studiów (Rzeczywisty)
Zakończenie podstawowe (Rzeczywisty)
Ukończenie studiów (Rzeczywisty)
Daty rejestracji na studia
Pierwszy przesłany
Pierwszy przesłany, który spełnia kryteria kontroli jakości
Pierwszy wysłany (Rzeczywisty)
Aktualizacje rekordów badań
Ostatnia wysłana aktualizacja (Rzeczywisty)
Ostatnia przesłana aktualizacja, która spełniała kryteria kontroli jakości
Ostatnia weryfikacja
Więcej informacji
Terminy związane z tym badaniem
Słowa kluczowe
Dodatkowe istotne warunki MeSH
Inne numery identyfikacyjne badania
- FUE.REC(42)/10-2024
Plan dla danych uczestnika indywidualnego (IPD)
Planujesz udostępniać dane poszczególnych uczestników (IPD)?
Opis planu IPD
Informacje o lekach i urządzeniach, dokumenty badawcze
Bada produkt leczniczy regulowany przez amerykańską FDA
Bada produkt urządzenia regulowany przez amerykańską FDA
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