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Clinical Trial Details — Status: Recruiting

Administrative data

NCT number NCT04835532
Other study ID # 2021-0050
Secondary ID
Status Recruiting
Phase N/A
First received
Last updated
Start date August 10, 2021
Est. completion date March 1, 2024

Study information

Verified date February 2021
Source Second Affiliated Hospital, School of Medicine, Zhejiang University
Contact ? ??, Master
Phone +86 13606507966
Email chenlili_1030@163.com
Is FDA regulated No
Health authority
Study type Interventional

Clinical Trial Summary

Alveolar bone resorption often occurs after tooth extraction. At present, guided bone regeneration technique is widely used in clinic since it leads to less trauma and less complications. Tenting screw technology, basic on the classical GBR, implants screws into the surgical area to prevent the barrier membrane from collapsing. Moreover, advanced platelet rich fibrin and injectable platelet-rich fibrin are used to provide the osteogenic function. The investigators intend to increase vertical alveolar bone augmentation by combining tenting screws and A-PRF, I-PRF.


Description:

Alveolar bone resorption often occurs after tooth extraction. At present, guided bone regeneration technique is widely used in clinic since it leads to less trauma and less complications. Tenting screw technology, basic on the classical GBR, implants screws into the surgical area to prevent the barrier membrane from collapsing. Moreover, advanced platelet rich fibrin and injectable platelet-rich fibrin are used to provide the osteogenic function. The investigators intend to increase vertical alveolar bone augmentation by combining tenting screws and A-PRF, I-PRF.


Recruitment information / eligibility

Status Recruiting
Enrollment 69
Est. completion date March 1, 2024
Est. primary completion date October 1, 2022
Accepts healthy volunteers Accepts Healthy Volunteers
Gender All
Age group 18 Years to 80 Years
Eligibility Inclusion Criteria: 1. 18-80 years old; 2. single tooth in the maxillary posterior area cannot be retained (third degree loosening / alveolar bone resorption to the periapical area), implantation is needed after extraction, and CBCT shows vertical bone defect = 3mm; 3. 4 weeks after extraction or missing teeth within 3-5 weeks; 4. adjacent teeth exist and loosening is less than ? degree; 5. periodontal disease in inactive stage, whole mouth bleeding index (FMBS) is less than 20%; 6. thick gingival biological type. 7. CBCT shows that the bone of the edentulous site meets the requirements of tent screw implantation (bone height = 3mm and bone mineral density is sufficient); 8. the patients and their families have informed consent and signed the informed consent form. Exclusion Criteria: 1. pregnant and lactating women; 2. smoking (> 10 cigarettes per day) and alcoholism; 3. taking anticoagulants within 3 months before operation; 4. suffering from autoimmune diseases, diabetes, liver disease, blood system diseases and infectious diseases; 5. patients taking any drugs that affect platelet function or whose platelet count is less than 200000/mm3 3 months before blood collection; 6. patients who have been treated with bisphosphate / steroids for a long time; 7. have received alveolar ridge bone augmentation surgery; 8. previous history of radiotherapy in the head and neck; 9. acute inflammation in edentulous sites; 10. inability to maintain good oral hygiene or follow-up visits as required.

Study Design


Related Conditions & MeSH terms


Intervention

Procedure:
guided bone gereration
guided bone generation: GBR is a procedure that uses barrier membranes with or without particulate bone grafts or/and bone substitutes. tenting screws: Screws are implanted in the surgical area to prevent the barrier membrane from collapsing. A-PRF/I-PRF: Obtained by autologous blood centrifugation.

Locations

Country Name City State
China 2nd Affiliated Hospital, School of Medicine, Zhejiang University, China Hangzhou Zhejiang

Sponsors (1)

Lead Sponsor Collaborator
Second Affiliated Hospital, School of Medicine, Zhejiang University

Country where clinical trial is conducted

China, 

Outcome

Type Measure Description Time frame Safety issue
Other Bone density, BD in the area of bone regeneration, ranging 2mm × 2mm T2(6 months after GBR)
Primary Buccal bone augmentation, BBA(bone height changes between T0 and T2) The sagittal plane of CBCT image is selected as the measuring plane, and the horizontal tangent of the inferior margin of maxillary sinus / paranasal sinus is selected as the baseline. The investigaters will measure the bone height changes by CBCT(three-dimensional CT) and Related measurement software. The unit of measurement is millimeter. T0(before surgery), T2(6 months after GBR)
Secondary Lingual bone augmentation, LBA(bone height changes between T0 and T2) The sagittal plane of CBCT image is selected as the measuring plane, and the horizontal tangent of the inferior margin of maxillary sinus / paranasal sinus is selected as the baseline.
The sagittal plane of CBCT image is selected as the measuring plane, and the horizontal tangent of the inferior margin of maxillary sinus / paranasal sinus is selected as the baseline.The investigaters will measure the bone height changes by CBCT(three-dimensional CT) and Related measurement software. The unit of measurement is millimeter.
T0(before surgery), T2(6 months after GBR)
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