Passive Fit of Implant-Supported Frameworks: Digital vs Conventional Impressions
Passive Fit Evaluation of Full-Arch Implant-supported Frameworks Using Digital and Conventional Impression Techniques: Crossover Study
研究概览
地位
条件
详细说明
Full-arch implant-supported fixed prostheses require a high degree of passive fit to avoid mechanical and biological complications. While digital impression workflows are increasingly used as alternatives to conventional splinted impressions, evidence directly comparing their clinical accuracy for complete-arch implant frameworks remains limited, particularly for the IO-Connect non-calibrated splinting system and the Reverse Scan Body technique.
Eight completely edentulous patients with at least four mandibular implants will be enrolled. Using a crossover design, each patient will undergo all three impression techniques: Group I (IO-Connect splinted scan bodies), Group II (Reverse Scan Body technique), and Group III (conventional splinted open-tray impression with polyvinyl siloxane and Type IV stone casts). For each technique, a corresponding implant-supported framework will be fabricated and evaluated for passivity of fit using the Sheffield one-screw test and periapical radiographs taken with a paralleling device to assess microgaps at the implant-framework interface.
研究类型
注册 (估计的)
阶段
- 不适用
联系人和位置
学习联系方式
- 姓名：Ahmed H Hazem Elsayed Helmi Atwa, BDS
- 电话号码：+20 1092758696
- 邮箱：ahmedhazem@mans.edu.eg
学习地点
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Dakahlia Governorate
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Al Mansurah、Dakahlia Governorate、埃及
- 招聘中
- Faculty of Dentistry, Mansoura University
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接触：
- Ahmed H Hazem Elsayed Helmi Atwa, BDS
- 电话号码：+20 1092758696
- 邮箱：ahmedhazem@mans.edu.eg
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首席研究员：
- Ahmed Hazem Elsayed Helmi Atwa, BDS
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参与标准
资格标准
适合学习的年龄
- 成人
- 年长者
接受健康志愿者
描述
Inclusion Criteria:
- Completely edentulous patients requiring full-arch implant-supported fixed prosthesis
- Age 35-70 years
- Adequate mandibular bone to place at least four implants without major grafting
- Ability to undergo digital scanning and radiographic evaluation
- Signed informed consent
Exclusion Criteria:
- Systemic conditions affecting healing (uncontrolled diabetes, immunosuppression)
- History of head/neck radiotherapy or bisphosphonate therapy
- Active oral infection or severe bruxism
- Strong gag reflex preventing accurate scanning
- Poor compliance or unwillingness to attend follow-up visits
学习计划
研究是如何设计的？
设计细节
- 主要用途：治疗
- 分配：随机化
- 介入模型：交叉作业
- 屏蔽：无（打开标签）
武器和干预
参与者组/臂 |
干预/治疗 |
|---|---|
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有源比较器：Group I: IO-Connect
Patients received complete-arch implant-supported frameworks fabricated using digital impressions obtained with IO-Connect non-calibrated splinted scan bodies.
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Digital impression of the mandibular arch obtained using IO-Connect non-calibrated splinted scan bodies to fabricate the implant-supported framework for Group I.
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有源比较器：Group II: Reverse Scan Body
Patients received complete-arch implant-supported frameworks fabricated using digital impressions obtained with the Reverse Scan Body (RSB) technique.
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Digital impression obtained using the Reverse Scan Body (RSB) technique, involving extraoral scanning of scan bodies and superimposition with intraoral tissue scans, to fabricate the implant-supported framework for Group II.
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有源比较器：Group III: Conventional Impression
Patients received complete-arch implant-supported frameworks fabricated using a conventional splinted open-tray impression technique.
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Conventional splinted open-tray impression using polyvinyl siloxane material and Type IV dental stone to fabricate the implant-supported framework for Group III.
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研究衡量的是什么？
主要结果指标
结果测量 |
措施说明 |
大体时间 |
|---|---|---|
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Passive Fit Assessed by Sheffield One-Screw Test
大体时间：The evaluation of passive fit by Sheffield one-screw test will be done 3 months after implant placement (3M-IP), at framework try-in for each of the three impression techniques.
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The framework was seated on all implants and a single distal screw was fully tightened; remaining screw sites were examined visually and tactilely for lifting, rocking, or gaps as an indicator of passive fit.
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The evaluation of passive fit by Sheffield one-screw test will be done 3 months after implant placement (3M-IP), at framework try-in for each of the three impression techniques.
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Passive Fit Assessed by Periapical Radiographs
大体时间：The evaluation of passive fit by periapical radiographs will be done 3 months after implant placement, at framework try-in for each of the three impression techniques.
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Intraoral periapical radiographs were obtained at each implant site using a paralleling device and evaluated for microgaps at the implant-framework interface.
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The evaluation of passive fit by periapical radiographs will be done 3 months after implant placement, at framework try-in for each of the three impression techniques.
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合作者和调查者
调查人员
- 学习椅：Fatma A El-Waseef, PhD、Mansoura University
研究记录日期
研究主要日期
学习开始 (实际的)
初级完成 (估计的)
研究完成 (估计的)
研究注册日期
首次提交
首先提交符合 QC 标准的
首次发布 (实际的)
研究记录更新
最后更新发布 (实际的)
上次提交的符合 QC 标准的更新
最后验证
更多信息
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