Marginal bone level and survival of short and standard-length implants after 3 years: An Open Multi-Center Randomized Controlled Clinical Trial

• Main Authors: Abrahamsson, I. (Author), Chen, S. (Author), Guljé, F. (Author), Mahallati, R. (Author), Palmer, P.J (Author), Stanford, C.M (Author), Zadeh, H.H (Author)
• Format: Article
• Language: English
• Published: Blackwell Munksgaard 2018
• Subjects: adult; Adult; adverse device effect; alveolar bone loss; Alveolar Bone Loss; alveolar ridge augmentation; Alveolar Ridge Augmentation; clinical trial; controlled study; Dental Implantation, Endosseous; dental implants; Dental Implants; Dental Prosthesis Design; devices; diagnostic imaging; edentulousness; female; Female; follow up; Follow-Up Studies; human; Humans; Jaw, Edentulous, Partially; male; Male; marginal bone loss; middle aged; Middle Aged; multicenter study; pathology; prosthesis design; Radiography, Dental; randomized controlled clinical trial; randomized controlled trial; short; survival; tooth implant; tooth implantation; tooth radiography
• Online Access: View Fulltext in Publisher

 Objectives: The present multi-center randomized controlled clinical trial sought to compare the marginal bone level (MBL) changes and survival of 6- and 11-mm implants. Material and Methods: Ninety-five patients receiving a total of 209 dental implants were enrolled. Subjects were randomly allocated to two cohorts: test (4.0 × 6 mm; N = 108) or control (4.0 × 11 mm; N = 101) implant groups. To be randomized, all edentulous sites were anatomically qualified to receive 11 mm implant. Two to three implants were placed in maxillary or mandibular posterior regions and loaded with splinted provisional restoration after 6 weeks and definitive restoration 6 months thereafter. Test and control implants were followed by clinical and radiographic examinations on an annual basis up to 3 years. Results: Radiographic assessment of MBL 3 years after loading revealed the bone to be located at 0.27 mm (±0.40) and 0.44 mm (±0.74) apical to the implant platform in the test and control groups, respectively. During the 3 years of follow-up since loading, 0.04 mm (±0.43) MBL gain and 0.02 mm (±0.76) of MBL loss were observed in the 6-mm (test) and 11-mm (control) groups, respectively. The MBL's for test and control were significantly different (p = 0.000) in favor of short implants. The cumulative survival rates from placement after 3 years were 96% and 99% for the 6- and 11-mm implants, respectively, with no statistical significance. Conclusions: Reconstruction of partially edentulous posterior maxilla or mandible with 6- or 11-mm implants led to stable marginal bone level and high implant survival rate after 3 years. © 2018 John Wiley & Sons A/S. Published by John Wiley & Sons Ltd