Effect of Retraction Techniques on Scan Accuracy
试验速览
- 阶段
- 不适用
- 状态
- 已完成
- 入组人数
- 50
- 试验地点
- 6
- 主要终点
- gingival displacement
研究概览
简要总结
The study aims to identify which retraction method offers optimal balance between tissue displacement, scan clarity, and patient comfort, particularly in the esthetic zone, while avoiding the use of CBCT. Results will guide clinicians in selecting the most effective and minimally invasive approach for digital impression workflows.
详细描述
This prospective clinical study investigates the impact of various gingival retraction techniques on scan accuracy, gingival displacement, bleeding control, and finish line visibility during intraoral scanning of anterior teeth. A total of 32 systemically and periodontally healthy participants were randomly assigned to one of five groups, each using a different retraction method:
- Retraction cord with astringent (RCA; Control group): Knitted cord impregnated with aluminum chloride (Ultrapak + Viscostat Clear; Ultradent Inc.)
- Cordless paste with astringent (EXP): Expasyl (Acteon PVT LTD)
- Cordless paste without astringent (MF): Magic FoamCord (Coltene Whaledent AG)
- Laser troughing (LT): Diode laser (iLase; Biolase Inc.)
Digital impressions were obtained before and after retraction using a Trios 3Shape intraoral scanner. The gingival displacement was measured digitally, and scan accuracy was analyzed via RMS error. Bleeding index, finish line visibility, and patient discomfort (VAS) were also recorded.
研究设计
- 研究类型
- Interventional
- 分配方式
- Randomized
- 干预模型
- Parallel
- 主要目的
- Other
- 盲法
- None
入排标准
- 年龄范围
- 25 Years 至 40 Years（Adult）
- 性别
- All
- 接受健康志愿者
- 是
入选标准
- •Age 25-40 years
- •Maxillary premolars with normal anatomical size, contour, and position
- •Systemically healthy individuals
- •Healthy gingiva and periodontium around abutments (GI = 0)
- •Good oral hygiene (PI = 0)
- •Pocket depth ≤ 3 mm
- •Thick gingival biotype
排除标准
- •Systemic conditions affecting periodontal status
- •Attachment loss, bleeding on probing, or plaque accumulation
研究组 & 干预措施
Group A: Cordless paste with astringent (EXP)
gingival retraction model 1 Expasyl (Acteon PVT LTD)
干预措施: Group A: Cordless paste with astringent (EXP): Expasyl (Acteon PVT LTD) (Procedure)
Group B: Cordless paste without astringent (MF):
gingival retraction model 2 Magic FoamCord (Coltene Whaledent AG)
干预措施: Group B: Cordless paste without astringent (MF): Magic FoamCord (Coltene Whaledent AG) (Procedure)
Group C:Laser troughing (LT):
gingival retraction model 3 Diode laser (iLase; Biolase Inc.)
干预措施: Group C: Laser troughing (LT): Diode laser (iLase; Biolase Inc.) (Procedure)
Retraction cord with astringent (RCA; Control group):
control-Knitted cord impregnated with aluminum chloride (Ultrapak + Viscostat Clear; Ultradent Inc.)
干预措施: Group D: Retraction cord with astringent (RCA; Control group): Knitted cord impregnated with aluminum chloride (Ultrapak + Viscostat Clear; Ultradent Inc.) (Procedure)
结局指标
主要结局
gingival displacement
时间窗: 30 days
Vertical and horizontal gingival displacement before and after gingival retraction method will be measured by using digital caliper.
次要结局
未报告次要终点
研究者
Dr. Merve Benli
Assos.prof.dr.merve benli
Istanbul University