[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"health-study-detail:100638909":3},{"organization":4,"outcomesModule":7,"designInfo":26,"detailedDescription":33,"studyPopulation":25,"armGroups":34,"interventions":41,"overallOfficials":46,"centralContacts":51,"locations":57,"responsibleParty":70,"collaborators":25,"id":72,"slug":25,"hasResults":73,"nctId":74,"briefTitle":75,"officialTitle":76,"acronym":77,"eligibilityCriteria":78,"healthyVolunteers":73,"sex":79,"minAge":80,"maxAge":81,"enrollmentInfo":82,"targetDuration":25,"studyType":85,"phases":86,"briefSummary":87,"conditions":88,"keywords":90,"overallStatus":94,"whyStopped":25,"lastUpdateSubmitDate":95,"lastUpdatePostDateStruct":96,"startDateStruct":99,"completionDateStruct":101,"leadSponsor":103,"locationsCount":104},{"fullName":5,"class":6},"Damascus University","OTHER",{"primaryOutcomes":8,"secondaryOutcomes":13,"otherOutcomes":25},[9],{"measure":10,"description":11,"timeFrame":12},"Implant Stability Quotient (ISQ).","Measured by resonance frequency analysis with MEGA ISQ II (MegaGen, Korea), Four readings per implant (mesial, distal, buccal, lingual); mean value reported","Immediately after implant placement (baseline) and 6 months post_surgery (before prosthetic loading).",[14,18,21],{"measure":15,"description":16,"timeFrame":17},"Vertical Bone Gain (mm)","Distance from implant shoulder to highest point of elevated sinus floor; measured on coronal sections using Ez3D plus software","at preoperative, 1 week post_surgery , 6 months post_surgery",{"measure":19,"description":20,"timeFrame":17},"Peri implant Bone Density (gray values)","regions of interest: coronal, middle, apical thirds",{"measure":22,"description":23,"timeFrame":24},"Implant Survival & Success","Survival = implant in situ. Success = absence of mobility, persistent pain, peri implant radiolucency, suppuration; and crestal bone loss \\\u003C1.5 mm on CBCT.","6 months post_surgery",null,{"allocation":27,"interventionModel":28,"interventionModelDescription":29,"primaryPurpose":30,"observationalModel":25,"timePerspective":25,"maskingInfo":31},"NA","SINGLE_GROUP","Prospective, single-arm case series. All eligible patients with residual alveolar bone height ≤4 mm in the posterior maxilla will receive the same intervention: one-stage external maxillary sinus lifting using the autogenous Bone Ring Technique with simultaneous dental implant placement. Participants will be followed for 6 months post-surgery. No comparator group is included.","TREATMENT",{"masking":32,"maskingDescription":25,"whoMasked":25},"NONE","The Bone Ring Technique (BRT) was introduced by Giesenhagen (2004) to address severe posterior maxillary atrophy. In this prospective single arm case series, after obtaining ethics approval (DN 28102025 542, Damascus University), ten patients with residual bone height ≤4 mm will undergo: harvesting of an 8 mm cylindrical autogenous bone ring from the mandibular symphysis using trephine burs; creation of a lateral window in the maxillary sinus using a straight handpiece with a diamond round bur; meticulous elevation of the Schneiderian membrane; placement of the bone ring; simultaneous insertion of a dental implant (ICX) through the ring into the native ridge; filling of the defect with xenograft (bovine) particles; coverage with a collagen membrane; and suturing Primary stability will be measured immediately after implantation using resonance frequency analysis (Mega ISQ II).\n\nCBCT scans (PaX i3D, VATECH) will be performed preoperatively, at 1 week, and at 6 months to quantify vertical bone gain (distance from implant shoulder to sinus floor) and peri implant bone density (Hounsfield like units).\n\nClinical follow up includes suture removal at 7 10 days and assessment of implant survival\u002Fsuccess at 6 months (absence of mobility, pain, radiolucency, suppuration, crestal bone loss \\\u003C1.5 mm).\n\nResults will be submitted for publication in a peer reviewed journal.",[35],{"label":36,"type":37,"description":38,"interventionNames":39},"Bone Ring Technique (BRT)","EXPERIMENTAL","Eligible patients with posterior maxillary atrophy (RBH ≤4 mm) will undergo a single surgical session. Preoperatively, CBCT will be performed. Under local anesthesia, the surgeon will harvest an autogenous bone ring from the chin (mandibular symphysis) using trephine burs. A lateral window will be created in the maxillary sinus wall using a straight handpiece with a diamond round bur. The sinus membrane will be elevated, and the bone ring will be placed into the sinus. A dental implant (ICX) will be inserted through the ring into the residual ridge. The defect will be filled with xenograft particles and covered with a collagen membrane. Sutures will be removed at 7-10 days. Patients will be followed for 6 months with clinical and CBCT evaluations.",[40],"Procedure: Bone Ring Technique (BRT)",[42],{"type":43,"name":36,"description":44,"armGroupLabels":45,"otherNames":25},"PROCEDURE","The Bone Ring Technique (BRT) is a one-stage surgical procedure that combines external maxillary sinus floor elevation with simultaneous dental implant placement. An autogenous bone ring is harvested from the mandibular symphysis using trephine burs. The sinus membrane is elevated via a lateral window approach created with a straight handpiece and diamond round bur. The bone ring is then placed into the sinus cavity, and a dental implant is inserted through the ring into the residual alveolar bone. The surgical site is augmented with xenograft particles and covered with a collagen membrane.",[36],[47],{"name":48,"affiliation":49,"role":50},"Khaldoun Darwich, professor of OMFS","Damascus University Syria","STUDY_DIRECTOR",[52],{"name":53,"role":54,"phone":55,"phoneExt":25,"email":56},"Adel Alassaf, Resident &MSc candidate in OMF","CONTACT","+963 949038706","sx19adel@gmail.com",[58],{"facility":59,"status":25,"city":60,"state":61,"zip":62,"country":63,"countryCode":25,"cosmosGeoPoint":64,"geoPoint":69,"contacts":25},"Oral and Maxillofacial Surgery Hospital, Faculty of Dentistry, Damascus University, Mezzeh Highway, Damascus, Syria","Damascus","Governorate","4671","Syria",{"type":65,"coordinates":66},"Point",[67,68],36.29128,33.5102,{"lat":68,"lon":67},{"type":71,"investigatorFullName":25,"investigatorTitle":25,"investigatorAffiliation":25,"oldNameTitle":25,"oldOrganization":25},"SPONSOR","100638909",false,"NCT07619846","Using Chin Bone Rings for Sinus Lifting and Dental Implants in One Surgery","Evaluation of Effectiveness of Bone Ring Technique in One Stage Surgery of External Maxillary Sinus Lifting With Implantation: A Prospective Case Series","BRT-SINUS","Inclusion Criteria:\n\n* Need for dental implant in posterior maxilla (premolar\u002Fmolar).\n* Residual alveolar bone height ≤4 mm on preoperative CBCT.\n* Age ≥18 years.\n* Controlled systemic health.\n* Able to comply with procedures and follow up.\n* Good oral hygiene.\n* Signed written informed consent.\n\nExclusion Criteria:\n\n* Uncontrolled systemic disease.\n* Head\u002Fneck radiotherapy.\n* Bisphosphonate therapy \\>3 years.\n* Autoimmune disease affecting healing.\n* Pregnancy\u002Flactation.\n* Active maxillary sinus pathology (sinusitis, cysts, polyps, tumours).\n* Heavy smoking (\\>10 cigarettes\u002Fday).\n* Severe bruxism.","ALL","18 Years","70 Years",{"count":83,"type":84},10,"ESTIMATED","INTERVENTIONAL",[27],"This study evaluates the Bone Ring Technique, a single stage procedure that combines external sinus floor elevation and dental implant placement using an autogenous bone ring harvested from the chin. Ten patients with residual alveolar bone height ≤4 mm in the posterior maxilla will be enrolled. Implant stability (ISQ), vertical bone gain, peri implant bone density, and implant survival will be assessed over 6 months. The aim is to reduce treatment time and surgical interventions compared to traditional two stage approaches.",[89],"Severe Alveolar Bone Atrophy of the Posterior Maxilla With Residual Bone Height ≤4 mm",[91,92,93],"Bone Ring Technique","Maxillary Sinus Floor Elevation","Dental Implant","NOT_YET_RECRUITING","2026-06-03",{"date":97,"type":98},"2026-06-04","ACTUAL",{"date":100,"type":84},"2026-05-31",{"date":102,"type":84},"2027-03-21",{"name":5,"class":6},1]