Oral and Maxillofacial Surgery Hospital, Faculty of Dentistry, Damascus University, Mezzeh Highway, Damascus, Syria
Damascus, Governorate, 4671, Syria
Not Yet Recruiting
NCT Number: NCT07619846
Using Chin Bone Rings for Sinus Lifting and Dental Implants in One Surgery
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.
Not Yet Recruiting
Trial opening soon.
Get NotifiedKey information
Age range
18 year–70 year
Sex eligibility
All sexes
Study type
Interventional
Phase
Not applicable
Primary location
About this study
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).
CBCT 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).
Clinical follow up includes suture removal at 7 10 days and assessment of implant survival/success at 6 months (absence of mobility, pain, radiolucency, suppuration, crestal bone loss <1.5 mm).
Results will be submitted for publication in a peer reviewed journal.
Who can participate
Healthy volunteers accepted: No
Only the study team can determine whether someone qualifies for participation.
Inclusion criteria
- Need for dental implant in posterior maxilla (premolar/molar).
- Residual alveolar bone height ≤4 mm on preoperative CBCT.
- Age ≥18 years.
- Controlled systemic health.
- Able to comply with procedures and follow up.
- Good oral hygiene.
- Signed written informed consent.
Exclusion criteria
- Uncontrolled systemic disease.
- Head/neck radiotherapy.
- Bisphosphonate therapy >3 years.
- Autoimmune disease affecting healing.
- Pregnancy/lactation.
- Active maxillary sinus pathology (sinusitis, cysts, polyps, tumours).
- Heavy smoking (>10 cigarettes/day).
- Severe bruxism.
Treatment and study plan
Bone Ring Technique (BRT)
ProcedureThe 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.
Primary outcomes
-
Implant Stability Quotient (ISQ).
Time frame: Immediately after implant placement (baseline) and 6 months post_surgery (before prosthetic loading).
Measured by resonance frequency analysis with MEGA ISQ II (MegaGen, Korea), Four readings per implant (mesial, distal, buccal, lingual); mean value reported
Secondary outcomes
-
Vertical Bone Gain (mm)
Time frame: at preoperative, 1 week post_surgery , 6 months post_surgery
Distance from implant shoulder to highest point of elevated sinus floor; measured on coronal sections using Ez3D plus software
-
Peri implant Bone Density (gray values)
Time frame: at preoperative, 1 week post_surgery , 6 months post_surgery
regions of interest: coronal, middle, apical thirds
-
Implant Survival & Success
Time frame: 6 months post_surgery
Survival = implant in situ. Success = absence of mobility, persistent pain, peri implant radiolucency, suppuration; and crestal bone loss <1.5 mm on CBCT.
Study contacts
Contact information is provided by the study sponsor or research team.
Sponsors and collaborators
Lead sponsor
Damascus University
Other
Registry information
Official study title
Evaluation of Effectiveness of Bone Ring Technique in One Stage Surgery of External Maxillary Sinus Lifting With Implantation: A Prospective Case Series
Acronym: BRT-SINUS
Important dates
- Study start
- 2026
- Primary completion
- 2027
- Study completion
- 2027
- First posted
- Jun 2, 2026
- Registry last updated
- Jun 4, 2026
OpenTrials presents study information sourced from ClinicalTrials.gov. The official registry record should be consulted for the latest information.
View the official ClinicalTrials.gov record (opens in a new tab)This listing is for discovery and informational purposes only. It is not medical advice, does not guarantee that a study is recruiting, and does not determine eligibility. Contact the study team and a qualified healthcare professional when considering participation.