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A study in orthodontic patients comparing a new method and a standard method for placing clear aligner attachments for placement accuracy and treatment outcomes

A novel indirect bonding technique for 3D accuracy and clinical performance of clear aligner attachments: a split-mouth randomized controlled trial in patients with full permanent dentition

Status
Active, not recruiting
Phases
Unknown
Study type
Interventional
Source
ANZCTR
Registry ID
ACTRN12626000515392
Enrollment
21
Registered
2026-04-24
Start date
2026-02-05
Completion date
2026-03-12
Last updated
2026-05-04

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

None listed

Brief summary

This study compares a novel indirect bonding technique with a conventional direct bonding technique for placing attachments in clear aligner orthodontic treatment. The aim is to assess the accuracy of attachment placement and their clinical performance over time. A split-mouth design will be used, with each participant receiving both techniques on different sides of the mouth. It is hypothesised that the indirect bonding technique will provide more precise attachment placement and better short-term clinical outcomes.

Interventions

Participants will undergo clear aligner treatment requiring orthodontic attachment placement. A split-mouth randomized controlled design will be used, in which one side of each participant is randomly allocated to the experimental intervention. The clinical application of the novel indirect bonding procedure is expected to take approximately 10–15 minutes per arch, including transfer tray placement, composite application, and light curing. The experimental intervention is a novel indirect bondi

Participants will undergo clear aligner treatment requiring orthodontic attachment placement. A split-mouth randomized controlled design will be used, in which one side of each participant is randomly allocated to the experimental intervention. The clinical application of the novel indirect bonding procedure is expected to take approximately 10–15 minutes per arch, including transfer tray placement, composite application, and light curing. The experimental intervention is a novel indirect bonding technique. Digitally planned attachment positions will be generated based on intraoral scans using orthodontic planning software. A 3D-printed transfer tray will then be fabricated to guide attachment placement. Attachments will be transferred intraorally using composite resin and light curing. The procedure will be performed by trained orthodontists in a university dental hospital clinic setting. The intervention will be delivered once at the time of initial attachment placement. Standard infection control procedures and manufacturer-recommended bonding protocols will be followed. Operator calibration will be conducted prior to study initiation to ensure consistency. The experimental intervention will be delivered within a single clinical session alongside the control procedure (split-mouth design), with no washout period between sides.

Sponsors

School of Stomatology, Fourth Military Medical University
Lead SponsorUniversity

Study design

Allocation
Randomised controlled trial
Intervention model
Other
Primary purpose
Treatment
Masking
Blinded (masking used) (Subject, Caregiver, Investigator, Outcomes Assessor)

Eligibility

Sex/Gender
All
Age
18 Years to 50 Years
Healthy volunteers
No

Inclusion criteria

1. Patients with a full permanent dentition 2. Undergoing clear aligner treatment without brackets 3. Good treatment compliance 4. Teeth included in the study have no obvious structural abnormalities 5. Teeth included in the study are free of caries

Exclusion criteria

1. Dental fluorosis or enamel hypoplasia/hyperplasia 2. Periodontal disease 3. Bruxism or short tooth crowns 4. Teeth with existing restorations 5. Tooth developmental abnormalities, including congenital hypodontia or other developmental defects

Outcome results

None listed

Source: ANZCTR · Data processed: May 7, 2026