Comparison of Color Stability, Bonding Time, and White Spot Lesion Between Flowable Nanocomposite and Packable Microhybrid Composite Used for Clear Aligner Attachments: A Split-Mouth Randomized Clinical Trial
试验速览
- 阶段
- 不适用
- 状态
- 招募中
- 入组人数
- 20
- 试验地点
- 2
- 主要终点
- Change in Tooth Color (ΔE) After Attachment Removal
研究概览
简要总结
This randomized split-mouth clinical trial aims to compare two different composite materials used for bonding attachments in clear aligner orthodontic therapy. Twenty adult participants with Class I malocclusion and mild crowding will receive flowable nanocomposite attachments on one side of the dental arch and packable microhybrid composite attachments on the opposite side. The primary outcome is the color change (ΔE) of the enamel surface after attachment removal, measured by a spectrophotometer (VITA Easyshade). Secondary outcomes include bonding and debonding time and changes in enamel surface roughness before and after treatment. The study will be conducted at the Orthodontic Department, College of Dentistry, University of Sulaimani. The goal is to determine which composite material provides better color stability, easier handling, and minimal impact on enamel surface characteristics during clear aligner therapy.
详细描述
Clear aligner therapy has become a popular alternative to conventional fixed orthodontic appliances due to its superior esthetics and comfort. However, the efficiency of aligner treatment often depends on the proper use of composite attachments that enhance tooth movement and retention. Different composite resins are used for this purpose, but their optical stability and effect on enamel integrity after removal remain concerns.
This prospective, split-mouth randomized clinical trial compares a flowable nanocomposite and a packable microhybrid composite used for clear aligner attachments. Each participant will receive both materials in opposite quadrants to minimize inter-individual variability. Outcomes will include enamel color change (ΔE CIE Lab* values), bonding/debonding time, and surface roughness assessment using digital and optical analysis methods.
The study hypothesis is that the flowable nanocomposite will exhibit superior color stability and faster handling time, with comparable enamel surface effects to the packable composite. Results from this trial may help establish standardized protocols for attachment material selection in clinical orthodontic practice.
研究设计
- 研究类型
- Interventional
- 分配方式
- Randomized
- 干预模型
- Crossover
- 主要目的
- Treatment
- 盲法
- Single (Outcomes Assessor)
盲法说明
Single-blind design: the outcome assessor will be blinded to the type of composite used on each quadrant.
入排标准
- 年龄范围
- 18 Years 至 40 Years（Adult）
- 性别
- All
- 接受健康志愿者
- 是
入选标准
- •Adults 18-40 years.
- •patients with class l malocclusion with in which there treatment will be completed in 6 month .
- •Completed clear aligner therapy and scheduled for attachment debonding at the study clinic.
- •Permanent teeth with intact buccal enamel at assessment sites.
- •No caries, restorations, cracks, fluorosis, or hypoplasia on assessed surfaces.
- •No bleaching within 6 months prior to baseline.
- •Good general health (ASA I-II) and able to provide written informed consent.
- •Satisfactory oral hygiene and gingival health (e.g., GI ≤ 1).
- •Willing and able to complete measurements: spectrophotometric shade (CIE L*, a*, b*), photographs/scans, and VAS for pain/discomfort.
- •Available for all visits and follow-up assessment.
排除标准
- •Patients younger than 18 or older than 40 years.
- •Patients presenting with severe or very severe anterior crowding (LII > 6 mm) or spacing will exclude from the study. Cases with posterior crossbites, open bites, or skeletal discrepancies
- •Presence of systemic diseases (ASA > II) that may affect healing, pain perception, or enamel quality.
- •Teeth with caries, restorations, fractures, enamel cracks, fluorosis, hypoplasia, or discolorations on the buccal surfaces at assessment sites.
- •Patients who have undergone tooth bleaching within the last 6 months.
- •History of major dental surgery or trauma in the study region.
- •Patients with poor oral hygiene or gingival inflammation (GI > 1).
- •Pregnant or lactating women.
- •Patients with allergy or hypersensitivity to composite resins or dental adhesives.
- •Individuals unable to provide informed consent or not willing to comply with study visits.
结局指标
主要结局
Change in Tooth Color (ΔE) After Attachment Removal
时间窗: Baseline (before bonding) and after attachment removal
The color change (ΔE) of the enamel surface will be measured using a VITA Easyshade spectrophotometer based on CIE Lab\* values before bonding and after debonding of the attachments. A ΔE value ≥ 3.3 will be considered clinically perceptible.
次要结局
未报告次要终点
研究者
Elaf Hussein Hasan
MSc Student in Orthodontics
Ministry of Health, Iraq