retainer with .5 mm thicknessretainer with 1 mm thickness
retainer with .5 mm thickness: direct 3d printed retainer with .5 mm thickness
retainer with 1 mm thickness: direct 3d printed retainer with 1 mm thickness,
Study summary
The aim of this study will be to evaluate the biological reaction of direct three dimensional printed retainers.
Primary objective is to evaluate bacterial growth and color stability between different thicknesses of 3d printed material used as a retainer .
Secondary objective is to determine the optimal thickness for use in clear aligner fabrication based on biological performance.
Eligibility
Sex
ALL
Min age
—
Max age
—
Healthy volunteers
No
Inclusion Criteria:
* -Finished fixed orthodontic therapy and seeking for retention as a part of their original treatment plan.
* Good oral hygiene.
* No habits (e.g., smoking)
Exclusion Criteria:
* Medication affecting saliva.
* intrinsic tooth discoloration.
* Uncooperative patients.
* Patient with periodontitis.
* Learning difficulties and inability to read written instructions.
Primary outcome measure(s)
Bacterial growth measured using colony-forming unit (CFU) count on agar plates. — from day 0 (Baseline time ) to 14 days after insertion Saliva samples will be collected from each participant at baseline and at day 14. Samples will be cultured on standard agar plates under aerobic conditions. After incubation, bacterial colonies will be counted, and results will be expressed in colony-forming units per milliliter (CFU/ml). A higher CFU value indicates greater bacterial growth.
Units:
CFU/ml
Color change of 3D printed retainers measured using spectrophotometer; ΔE calculated at day 0 and day 14. — from day 0 (baseline time ) to 14 days after insertion The color stability of the retainers will be assessed using a spectrophotometer (VITA Easyshade or equivalent). Color difference (ΔE) will be calculated between baseline and day 14. A ΔE \> 3.3 is considered clinically perceptible. Scale range: 0-10; higher ΔE score indicates greater color change and worse color stability.
Units:
ΔE (Delta E) score
This page summarises publicly available registry data for informational purposes — not medical advice. Eligibility is determined by each study team; patients should discuss participation with their clinician.
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