Christopher Riben1, Andreas Thor2. 1. Department of Oral & Maxillofacial Surgery, Department of Surgical Sciences, Uppsala University, Uppsala, Sweden. 2. Department of Oral & Maxillofacial Surgery, Department of Surgical Sciences, Uppsala University, Uppsala, Sweden. andreas.thor@akademiska.se.
Abstract
BACKGROUND: There is a limited amount of studies evaluating long-term results of the sinus membrane elevation technique for bone formation around implants in the maxillary sinus floor without the use of bone graft material. PURPOSE: To investigate the long-term results of this technique with regard to implant survival and bone gain in the maxillary sinus floor. MATERIALS AND METHODS: A retrospective study was conducted on patients who had undergone the surgical procedure from November 2001 to August 2008. Thirty-six patients with a total of 87 implants (ASTRA TECH Implant System™) in 53 sinuses were examined. After a submerged healing period of 6 months and at least 12 months of loading, the patients were examined clinically and radiologically. Implant stability was measured using resonance frequency analysis (RFA). RESULTS: The mean follow-up time was 4.6 years (range 1.5-7 years). Five implants were lost giving a survival rate of 94.3%.Subantral preoperative vertical bone levels were in the range of 1 to 10 mm. The average bone gain at the sinus floor was 6 mm. The 55 fixtures eligible for RFA displayed a mean implant stability quotient of 77 (range 56-85.5). CONCLUSION: The present study illustrates the long-term reliability of the technique.
BACKGROUND: There is a limited amount of studies evaluating long-term results of the sinus membrane elevation technique for bone formation around implants in the maxillary sinus floor without the use of bone graft material. PURPOSE: To investigate the long-term results of this technique with regard to implant survival and bone gain in the maxillary sinus floor. MATERIALS AND METHODS: A retrospective study was conducted on patients who had undergone the surgical procedure from November 2001 to August 2008. Thirty-six patients with a total of 87 implants (ASTRA TECH Implant System™) in 53 sinuses were examined. After a submerged healing period of 6 months and at least 12 months of loading, the patients were examined clinically and radiologically. Implant stability was measured using resonance frequency analysis (RFA). RESULTS: The mean follow-up time was 4.6 years (range 1.5-7 years). Five implants were lost giving a survival rate of 94.3%.Subantral preoperative vertical bone levels were in the range of 1 to 10 mm. The average bone gain at the sinus floor was 6 mm. The 55 fixtures eligible for RFA displayed a mean implant stability quotient of 77 (range 56-85.5). CONCLUSION: The present study illustrates the long-term reliability of the technique.
Authors: Giovanni Battista Menchini-Fabris; Paolo Toti; Giovanni Crespi; Ugo Covani; Roberto Crespi Journal: Int J Environ Res Public Health Date: 2020-10-01 Impact factor: 3.390